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Specifications of International Thread Standards

Thread Standards:

The most frequently used thread standard is the metric ISO Thread. However, there are other thread standards as well. These are either based on foreign standards or are used for special applications. E.G. in the medical technology, in aeronautical engineering or astronautics. The most common threads are:
• ISO Thread (metric)
• Whitworth Thread
• Pipe Thread
• Trapezoidal Thread
• Knuckle Thread
• Buttress Thread

The thread abbreviation includes the thread code letter and the nominal thread diameter or the thread size. Additional values for pitch or TPI, tolerance, multi-lead, taper and left-handedness are added. Often threads that are according to DIN Standard have the major DIN number put in front of the thread abbreviation.

Talking of screws the major diameter for screws is determined by the thread tips.

The minor diameter by the groove of the thread.

The pitch diameter is the distance of two opposite flanks or the distance of the center line of the profile.

Menet típusa	Angol elnevezés
ISO	International Organization for Standardization
NC	National Coarse
UNC	Unified National Coarse
NF	National Fine
UNF	Unified National Fine
UNEF	Unified National Extra Fine
UN	Unified National 8-,12- and 16 pitch series
UNS	Special Threads of American National Form
NPT	National Taper Pipe 1:16
NPTF	National Taper Pipe Dryseal 1:16
NPS	National Standard Straight Pipe
NPSM	National Standard Straight Pipe for free fitting mechanical
NPSF	National Standard Internal Straight Pipe Dryseal
BSW	British Standard Withworth Coarse
BSF	British Standard Fine
BSP	British Strandard Pipe
BSPT	British Standard Pipe Taper
BA	British Standard Association

Lens mount Threads

In photography a standardized adaption device for the changing of lenses which works independent from the manufacturer is called screw thread or lens thread. Screw threads are the forerunners of the bayonet connectors, which dominate the market nowadays. Screw threads were mainly used upto the 1980s. However, the M42-screw thread still offers a low-priced alternative to the analoguos mirror reflex camera with high-quality lenses.

M39-Screw Thread M39 x 26Gg
The M39-Screw Thread - also called Leica L-Mount - was used in miniature cameras since the 1930s. Companies that offer these mounts are e.g. Leica, Voigtländer, Canon and Ricoh. For this thread sporadically high-quality lenses are still available today.

M40-Screw Thread
The M40-Screw Thread is a quite rare thread. It was mainly used in the 1930s. E.g. the Praktiflex and Praktiflex II of the brand Praktika resp. Pentacon had this lens connection. Some CCD-camaras still use the M40-thread nowadays.

M42-Screw Thread M42 x 1.0
M42 is the term for a standardized screw thread that was used for cameras of e.g. Praktica, Voigtländer, Fujica ST, Ricoh and Pentax. M42 is the successor of the older M39-screw thread and was developped in a time when the manufacturer's didn't yet try to tie the users down to their own company's lens bayonets.

T2-screw thread M42 x 0.75
T2 is an old Tamron standard. There are multiple adapters available for T2, from T2 to other sizes and vice versa. For a number of applications the T2-mount has become standard, e.g. for microscopes, telescopes and slide duplicators.

C-Mount 1" x 32 TPI UN 2A
Standard connection of lenses for CCD-cameras, with a standard mount thread (at the lens: male thread 1"-32UN2A) with a standard flange focal distance of 17.526 mm.

CS-Mount 1" x 32 TPI UN 2A
Is equal to C-Mount apart from the standard flange focal. The CS-mount has a flange focal distance of 12.5 mm. The CS-Mount standard is the "younger" standard, which meets the demand for shorter lengths.

Tripod Threads DIN 4503 / ISO 1222

1/4" - 20 UNC
This thread is used for rangefinder camera, roll film cameras (also DSLRs) up to medium format cameras, quick release plates and panoramic heads.

3/8" - 16 UNC
Some medium format cameras and almost all large size cameras as well as most of the connectors between tripods and panoramic heads use this thread.

ISO Metric Fine Thread DIN 13

Névleges átmérő [mm x mm]	Menetemelkedés [mm]	Névleges átmérő [mm x mm]	Menetemelkedés [mm]
2,00 x 0,25	1,75	22,00 x 2,00	20,00
2,20 x 0,25	1,95	24,00 x 1,00	23,00
2,30 x 0,25	2,05	24,00 x 1,50	22,50
2,50 x 0,35	2,15	24,00 x 2,00	22,00
2,60 x 0,35	2,20	25,00 x 1,00	24,00
3,00 x 0,35	2,65	25,00 x 1,50	23,50
3,50 x 0,35	3,15	26,00 x 1,50	24,50
4,00 x 0,35	3,65	27,00 x 1,50	25,50
4,00 x 0,50	3,50	27,00 x 2,00	25,00
5,00 x 0,50	4,50	28,00 x 1,50	26,50
6,00 x 0,50	5,50	28,00 x 2,00	26,00
6,00 x 0,75	5,20	30,00 x 1,00	29,00
7,00 x 0,75	6,20	30,00 x 1,50	28,50
8,00 x 0,50	7,50	30,00 x 2,00	28,00
8,00 x 0,75	7,20	32,00 x 1,50	30,50
8,00 x 1,00	7,00	33,00 x 1,50	31,50
9,00 x 0,75	8,20	33,00 x 2,00	31,00
9,00 x 1,00	8,00	34,00 x 1,50	32,50
10,00 x 0,50	9,50	35,00 x 1,50	33,50
10,00 x 0,75	9,20	36,00 x 1,50	34,50
10,00 x 1,00	9,00	36,00 x 2,00	34,00
10,00 x 1,25	8,80	36,00 x 3,00	33,00
11,00 x 1,00	10,00	38,00 x 1,50	36,50
12,00 x 0,75	11,20	39,00 x 1,50	37,50
12,00 x 1,00	11,00	39,00 x 2,00	37,00
12,00 x 1,25	10,80	39,00 x 3,00	36,00
12,00 x 1,50	10,50	40,00 x 1,50	38,50
13,00 x 1,00	12,00	40,00 x 2,00	38,00
14,00 x 1,00	13,00	40,00 x 3,00	37,00
14,00 x 1,25	12,80	42,00 x 1,50	40,50
14,00 x 1,50	12,50	42,00 x 2,00	40,00
15,00 x 1,00	14,00	42,00 x 3,00	39,00
15,00 x 1,50	13,50	45,00 x 1,50	43,50
16,00 x 1,00	15,00	45,00 x 2,00	43,00
16,00 x 1,50	14,50	45,00 x 3,00	42,00
18,00 x 1,00	17,00	48,00 x 1,50	46,50
18,00 x 1,50	16,50	48,00 x 2,00	46,00
18,00 x 2,00	16,00	48,00 x 3,00	45,00
20,00 x 1,00	19,00	50,00 x 1,50	48,50
20,00 x 1,50	18,50	50,00 x 2,00	48,00
20,00 x 2,00	18,00	50,00 x 3,00	47,00
22,00 x 1,00	21,00	52,00 x 1,50	50,50
22,00 x 1,50	20,50	52,00 x 2,00	50,00
-	-	52,00 x 3,00	49,00

ISO Metric Coarse Thread DIN 13

Nominal Diameter M	Pitch mm	Tapping Drill Size mm
1,0	0,25	0,75
1,1	0,25	0,85
1,2	0,25	0,95
1,4	0,30	1,10
1,6	0,35	1,25
1,8	0,35	1,45
2,0	0,40	1,60
2,2	0,45	1,75
2,5	0,45	2,05
3,0	0,50	2,50
3,5	0,60	2,90
4,0	0,70	3,30
4,5	0,75	3,70
5,0	0,80	4,20
6,0	1,00	5,00
7,0	1,00	6,00
8,0	1,25	6,80
9,0	1,25	7,80
10,0	1,50	8,50
11,0	1,50	9,50
12,0	1,75	10,25
14,00	2,00	12,00
16,00	2,00	14,00
18,00	2,50	15,50
20,00	2,50	17,50
22,00	2,50	19,50
24,00	3,00	21,00
27,00	3,00	24,00
30,00	3,50	26,50
33,00	3,50	29,50
36,00	4,00	32,00
39,00	4,00	35,00
42,00	4,50	37,50
45,00	4,50	40,50
48,00	5,00	43,00
52,00	5,00	47,00
56,00	5,50	50,50
60,00	5,50	54,50
64,00	6,00	58,00
68,00	6,00	62,00

Pg Thread DIN 40430
Steel Conduit Thread

For cable diameter mm	Thread Size	Major Diameter mm	Tapping Drill Size	Pitch mm
6,0	Pg 7	12,5	11,3	1,27
8,0	Pg 9	15,2	13,9	1,41
10,0	Pg 11	18,6	17,3	1,41
12,0	Pg 13,5	20,4	19,1	1,41
14,0	Pg 16	22,5	21,2	1,41
18,0	Pg 21	28,3	26,8	1,59
25,0	Pg 29	37	35,5	1,59
32,0	Pg 36	47	45,5	1,59
38,0	Pg 42	54,0	52,5	1,59
43,0	Pg 48	59,3	57,8	1,59

On 31.12.1999 the safety standard VDE 0619 which included the standards DIN 46319 for metric sizes and DIN 46320 for PG-sizes were withdrawn. On 01.01.2000 the new standard DIN EN 50262 came into force. The new standard uses the new metric sizes. In the transitional period - until 01.03.2001 - the PG-standard could still be used. For replacement PG-items may still be used. The ten sizes PG 7 / 9 / 11 / 13,5 / 16 / 21 / 29 / 36 / 42 and PG 48 were replaced by eight new metric sizes, i.e. M 12 / 16 / 20 / 25 / 32 / 40 / 50 and M 63. No direct conversion is possible! By this new standard a suitable solution was not achieved.
Possibilites for a conversion:
PG Size	Major Diameter mm	For cable diameter mm	Conversion to metric mm
Pg 7	12,5	6,0	M 12
Pg 7	12,5	6,0	M 16
Pg 9	15,5	8,0	M 16
Pg 11	18,6	10,0	M 20
Pg 13,5	20,4	12,0	M 20
Pg 13,5	20,4	12,0	M 25
Pg 16	22,5	14,0	M 20
Pg 16	22,5	14,0	M 25
Pg 21	28,3	18,0	M 25
Pg 21	28,3	18,0	M 32
Pg 29	28,3	18,0	M 32
Pg 29	28,3	18,0	M 40
Pg 36	47,0	32,0	M 50
Pg 42	54,0	38,0	M 50
Pg 42	54,0	38,0	M 63
Pg 48	59,3	43,0	M 63
Wrench Size for Cable Connection
Connecting Thread		Wrench Size mm
Old
PG7		SW 15
PG9		SW 19
PG11		SW 22
PG13,5		SW 24
PG16		SW 27
PG21		SW 33
PG29		SW 42
PG36		SW 53
PG42		SW 60
PG48		SW 65
New
M12x1,5		SW 15
M16x1,5		SW 19
M20x1,5		SW 24
M25x1,5		SW 30
M32x1,5		SW 36
M40x1,5		SW 46
M50x1,5		SW 55
M63x1,5		SW 66

Siemens & Halske Thread

Siemens & Halske Thread was used in telephones approx. 1900 AD.

Thread No.	Major Diameter mm	Tapping Drill Size mm	Pitch mm	Thread Angle °
11	8,95	7,0	1,21	50
14	7,20	5,7	1,05	58
17	6,00	4,6	0,89	55
18	5,75	4,5	0,78	58
21	5,12	4,0	0,78	58
25	4,00	3,18	0,66	61
27	3,37	2,58	0,66	68
29	2,80	2,22	0,53	66
31	2,16	1,63	0,49	68
33	1,78	1,39	0,34	59
34	1,63	1,29	0,30	55
36	1,22	0,95	0,22	50

E Thread DIN 40400
Edison Thread

The name Edison thread for the socket of lamps traces back to Thomas Alva Edison.

Thread Size	Major Diameter mm	Tapping Drill Size mm	Pitch mm
E 5,5	5,5	4,9	1,0
E 10	10,0	8,8	1,81
E 14	14,0	12,5	2,82
E 16	16,0	14,7	2,50
E 18	18,0	17,0	3,00
E 27	27,0	24,5	3,62
E 33	33,0	30,8	4,23
E 40	40,0	36,3	6,35

Glass Thread DIN 40450 (Glasg)

DIN 40450 has been deleted without replacement. Nevertheless still cover glasses and caps using this thread are still produced. Two examples of companies still producing under this standard are RZB (Rudolf Zimmernann, Bamberg GmbH) and Ferraz Shawmut (Lindner). Even the screw joint with the self-sealing grommet is using PG.

Thread Size	Cover Glass mm	Cap mm	Pitch mm	Thread Length Cover Glass mm	Thread Length Cap min. mm
Glasg 74,5	73,5 - 74,5	69,5 - 72,5	7,5	19,0 - 21,0	22,0
Glasg 84,5	83,5 - 84,5	78,0 - 81,0	7,5	21,0 - 23,0	24,0
Glasg 99	98,0 - 99,0	92,5 - 95,5	7,5	24,0 - 26,0	27,0
Glasg 123,5	122,5 - 123,5	117,0 - 120,0	7,5	27,0 - 29,0	30,0
Glasg 158	156,0 - 158,0	149,0 - 153,5	12,0	37,0 - 40,0	42,0
Glasg 188	186,0 - 188,0	179,0 - 183,5	12,0	42,0 - 45,0	47,0

Valves for Vehicle Tyres DIN 7756

Nominal Diameter	Bolt				Nut				Pitch mm	TPI
	Major Diameter mm		Minor Diameter mm		Major Diameter mm		Minor Diameter mm
	max.	min.	max.	min.	max.	min.	max.	min.
Vg 5	5,200	5,100	4,400	4,300	5,520	5,420	4,700	4,600	0,706	36
Vg 5,2	5,280	5,180	3,900	3,800	5,680	5,580	4,300	4,200	1,058	24
Vg 6	6,030	5,930	5,130	5,030	6,280	6,180	5,400	5,300	0,794	32
Vg 8	7,747	7,620	6,631	6,504	8,061	7,934	6,945	6,818	0,794	32
Vg 9,6	9,650	9,550	8,670	8,552	9,800	9,730	8,900	8,750	1,000	25
Vg 10	10,338	10,211	9,062	8,935	10,664	10,537	9,388	9,261	0,907	28
Vg 12	12,243	12,091	10,869	10,717	12,601	12,449	11,227	11,075	0,977	26

Sewing Machine Thread (Nähnorm 100)

Nominal Diameter Inch	Major Diameter Bolt mm	Minor Diameter Bolt mm	Major Diameter Nut mm	Minor Diameter Nut mm	TPI	Pitch mm
5/64"	1,984	1,468	2,013	1,554	64	0,397
3/32"	2,381	2,051	2,399	2,106	100	0,254
3/32"	2,381	1,791	2,414	1,889	56	0,453
1/8"	3,175	2,425	3,217	2,550	44	0,577
9/64"	3,572	2,748	3,618	2,885	40	0,635
11/64"	4,366	3,542	3,412	3,679	40	0,635
3/16"	4,763	4,731	4,820	4,903	32	0,796
3/16"	4,763	3,591	4,828	3,786	28	0,907
15/64"	5,953	4,781	6,018	4,976	28	0,907
1/4"	6,350	5,526	6,396	5,663	40	0,635
9/32"	7,144	5,494	7,236	5,769	20	1,270
9/32"	7,144	5,972	7,209	6,167	28	0,907
5/16"	7,938	6,104	8,040	6,410	18	1,411
3/8"	9,525	8,353	9,590	8,548	28	0,907
7/16"	11,113	9,941	11,178	10,136	28	0,907
9/16"	14,288	12,638	14,380	12,913	20	1,270

Bicycle Screw Thread DIN 79012

For cycles and motor-scooters

Thread Size mm	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
Fg 2	2,096	1,613	56	0,454
Fg 2,3	2,299	1,816	56	0,454
Fg 2,6	2,604	2,121	56	0,454
Fg 6,35	6,350	5,310	26	0,977
Fg 7,9	7,938	6,898	26	0,977
Fg 9,5	9,525	8,485	26	0,977
Fg 14,3	14,288	12,934	20	1,270
Fg 25,4	25,400	24,272	24	1,058
Fg 32,8	32,766	31,638	24	1,058
Fg 34,8	34,798	33,670	24	1,058

C.E.I.-Thread

Cycle Engineer Institution Thread, used in the British bicycle industry. Smetimes the name "BSC" or "BSCy" is used. This series replaced the Cycle Engineers Institute (CEI) thread. Though the two series are somewhat different.

Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
0,056	1,422	0,965	62	0,409
0,064	1,626	1,190	62	0,409
0,072	1,829	1,393	62	0,409
0,080	2,032	1,596	62	0,409
0,092	2,337	1,854	56	0,453
0,104	2,642	2,642	44	0,577
0,125	3,175	2,499	40	0,635
0,154	3,912	3,236	40	0,635
0,175	4,445	3,600	32	0,794
0,187	4,762	3,917	32	0,794
0,250	6,350	5,309	26	0,977
0,266	6,756	5,715	26	0,977
0,281	7,137	6,096	26	0,977
0,312	7,937	6,896	26	0,977
0,375	9,525	8,484	26	0,977
0,562	14,287	12,287	20	1,270
1,000	25,400	24,359	26	0,977
1,290	32,766	31,639	24	1,058
1,370	34,797	33,670	24	1,058
1,437	36,512	35,385	24	1,058
1,500	38,100	36,973	24	1,058

Löwenherz Thread

Precision mechanic thread. Was mainly used in Germany and Austria.
Originally it was a V-Thread. The flattened form was admitted as standard on the Congress for Introduction of Standardized Threads
for Fixing Screws in Fine Mechanics which was held in Munich in 1892.
Was replaced by the metric thread DIN 13 later.

Major Diameter mm	Tapping Drill Size mm	Pitch mm	Wrench Size mm
1,000	0,625	0,250	3
1,200	0,825	0,250	4
1,400	0,950	0,300	5
1,700	1,175	0,350	5
2,000	1,400	0,400	6
2,300	1,700	0,400	6
2,600	1,925	0,450	7
3,000	2,250	0,500	7
3,500	2,600	0,600	8
4,000	2,950	0,700	8
4,500	3,375	0,750	10
5,000	3,800	0,800	10
5,500	4,150	0,900	12
6,000	4,500	1,000	12
7,000	5,350	1,100	14
8,000	6,200	1,200	14
9,000	7,050	1,300	17
10,000	7,900	1,400	17

Bodmer Thread

Bodmer Thread, formerly it was a thread for mechanical and optical instruments.

Major Diameter mm	Tapping Drill Size mm	Pitch mm	Threads on 25 mm
3,000	2,107	0,625	40
3,500	2,607	0,625	40
4,000	2,978	0,715	35
4,500	3,478	0,715	35
5,000	3,808	0,834	30
5,500	4,308	0,834	30
6,000	4,808	0,834	30
7,000	5,570	1,000	25
8,000	6,670	1,000	25
9,000	7,213	1,250	20
10,000	8,213	1,250	20
11,000	9,213	1,250	20
12,000	9,897	1,471	17
13,000	10,897	1,471	17
14,000	11,535	1,724	14,5
15,000	12,535	1,724	14,5
16,000	13,141	2,000	12,5
18,000	15,141	2,000	12,5
20,000	16,426	2,500	10
22,000	18,426	2,500	10
24,000	20,026	2,780	9
26,000	22,026	2,780	9
28,000	23,532	3,125	8
30,000	25,532	3,125	8
32,000	26,895	3,571	7
34,000	28,895	3,571	7
38,000	32,043	4,167	6
42,000	36,043	4,167	6
46,000	38,852	5,000	5
50,000	42,852	5,000	5

VDI Thread

In 1876 Karl Deliste suggested this thread and it was accepted by the VDI (Verein Deutscher Ingenieure) in Breslau 1888. However, this thread was replaced by the S.I.-Thread on the International Congress named "Internationaler Kongress zur Vereinheitlichung der Gewinde" which took place on 3rd and 4th October 1898 and is no longer used.

Major Diameter mm	Pitch mm	Tapping Drill Size mm	Wrench Size mm
6,00	1,00	4,50	11
7,00	1,10	5,35	14
8,00	1,20	6,20	14
9,00	1,30	7,05	18
10,00	1,40	7,90	18
12,00	1,60	9,60	22
14,00	1,80	11,30	25
16,00	2,00	13,00	28
18,00	2,20	14,70	31
20,00	2,40	16,40	34
22,00	2,80	17,80	37
24,00	2,80	19,80	40
26,00	3,20	21,20	43
28,00	3,20	23,20	46
30,00	3,60	24,60	49
32,00	3,60	26,60	52
36,00	4,00	30,00	58
40,00	4,40	33,40	64

Whitworth Fine Thread 1 DIN 239

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.

Thread Size	Bolt Diameter mm	Nut Diameter mm	TPI	Pitch mm
W 56 x 1/4"	55,00	56,00	4	6,35
W 60 x 1/4"	59,00	60,00	4	6,35
W 64 x 1/4"	63,00	64,00	4	6,35
W 68 x 1/4"	67,00	68,00	4	6,35
W 72 x 1/4"	71,00	72,00	4	6,35
W 76 x 1/4"	75,00	76,00	4	6,35
W 80 x 1/4"	79,00	80,00	4	6,35
W 84 x 1/4"	83,00	84,00	4	6,35
W 89 x 1/4"	88,00	89,00	4	6,35
W 94 x 1/4"	93,00	94,00	4	6,35
W 99 x 1/4"	98,00	99,00	4	6,35
W 104 x 1/4"	103,00	104,00	4	6,35
W 109 x 1/4"	108,00	109,00	4	6,35
W 114 x 1/4"	113,00	114,00	4	6,35
W 119 x 1/4"	118,00	119,00	4	6,35
W 124 x 1/4"	123,00	114,00	4	6,35
W 129 x 1/4"	128,00	129,00	4	6,35
W 134 x 1/4"	133,00	134,00	4	6,35
W 139 x 1/4"	138,00	139,00	4	6,35
W 144 x 1/4"	143,00	144,00	4	6,35
W 149 x 1/4"	148,00	149,00	4	6,35
W 154 x 1/4"	153,00	154,00	4	6,35
W 159 x 1/4"	158,00	159,00	4	6,35
W 164 x 1/4"	163,00	164,00	4	6,35
W 169 x 1/4"	168,00	169,00	4	6,35
W 174 x 1/4"	173,00	174,00	4	6,35
W 179 x 1/4"	178,00	179,00	4	6,35
W 184 x 1/4"	183,00	184,00	4	6,35
W 189 x 1/4"	188,00	189,00	4	6,35
W 194 x 1/4"	193,00	194,00	4	6,35
W 199 x 1/4"	198,00	199,00	4	6,35
W 204 x 1/4"	203,00	204,00	4	6,35
W 209 x 1/4"	208,00	209,00	4	6,35
W 214 x 1/4"	213,00	214,00	4	6,35
W 219 x 1/4"	218,00	219,00	4	6,35
W 224 x 1/4"	223,00	224,00	4	6,35
W 229 x 1/4"	228,00	229,00	4	6,35
W 234 x 1/4"	233,00	234,00	4	6,35
W 239 x 1/4"	238,00	239,00	4	6,35
W 244 x 1/4"	243,00	244,00	4	6,35
W 249 x 1/4"	248,00	249,00	4	6,35
W 254 x 1/4"	253,00	254,00	4	6,35
W 259 x 1/4"	258,00	259,00	4	6,35
W 264 x 1/4"	263,00	264,00	4	6,35
W 269 x 1/4"	268,00	269,00	4	6,35
W 274 x 1/4"	273,00	274,00	4	6,35
W 279 x 1/4"	278,00	279,00	4	6,35
W 284 x 1/4"	283,00	284,00	4	6,35
W 289 x 1/4"	288,00	289,00	4	6,35
W 294 x 1/4"	293,00	294,00	4	6,35
W 299 x 1/4"	298,00	299,00	4	6,35
W 304 x 1/4"	303,00	304,00	4	6,35
W 309 x 1/4"	308,00	309,00	4	6,35
W 314 x 1/4"	313,00	314,00	4	6,35
W 319 x 1/4"	318,00	319,00	4	6,35
W 324 x 1/4"	323,00	324,00	4	6,35
W 329 x 1/4"	328,00	329,00	4	6,35
W 334 x 1/4"	333,00	334,00	4	6,35
W 339 x 1/4"	338,00	339,00	4	6,35
W 344 x 1/4"	343,00	344,00	4	6,35
W 349 x 1/4"	348,00	349,00	4	6,35
W 354 x 1/4"	353,00	354,00	4	6,35
W 359 x 1/4"	358,00	359,00	4	6,35
W 364 x 1/4"	363,00	364,00	4	6,35
W 369 x 1/4"	368,00	369,00	4	6,35
W 374 x 1/4"	373,00	374,00	4	6,35
W 379 x 1/4"	378,00	379,00	4	6,35
W 384 x 1/4"	383,00	384,00	4	6,35
W 389 x 1/4"	388,00	389,00	4	6,35
W 394 x 1/4"	393,00	394,00	4	6,35
W 399 x 1/4"	398,00	399,00	4	6,35
W 404 x 1/4"	403,00	404,00	4	6,35
W 409 x 1/4"	408,00	409,00	4	6,35
W 414 x 1/4"	413,00	414,00	4	6,35
W 419 x 1/4"	418,00	419,00	4	6,35
W 424 x 1/4"	423,00	424,00	4	6,35
W 429 x 1/4"	428,00	429,00	4	6,35
W 434 x 1/4"	433,00	434,00	4	6,35
W 439 x 1/4"	438,00	439,00	4	6,35
W 444 x 1/4"	443,00	444,00	4	6,35
W 449 x 1/4"	448,00	449,00	4	6,35
W 454 x 1/4"	453,00	454,00	4	6,35
W 459 x 1/4"	458,00	459,00	4	6,35
W 464 x 1/4"	463,00	464,00	4	6,35
W 469 x 1/4"	468,00	469,00	4	6,35
W 474 x 1/4"	473,00	474,00	4	6,35
W 479 x 1/4"	478,00	479,00	4	6,35
W 484 x 1/4"	483,00	484,00	4	6,35
W 489 x 1/4"	488,00	489,00	4	6,35
W 494 x 1/4"	493,00	494,00	4	6,35
W 499 x 1/4"	498,00	499,00	4	6,35

Whitworth Fine Thread 2 DIN 240

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.

Thread Size	Bolt Diameter mm	Nut Diameter mm	TPI	Pitch mm
W 20 x 1/10"	19,62	20,00	10	2,54
W 22 x 1/10"	21,62	22,00	10	2,54
W 24 x 1/10"	23,62	24,00	10	2,54
W 27 x 1/10"	26,62	27,00	10	2,54
W 30 x 1/10"	29,62	30,00	10	2,54
W 33 x 1/10"	33,62	33,00	10	2,54
W 36 x 1/8"	35,53	36,00	8	3,175
W 39 x 1/8"	38,53	39,00	8	3,175
W 42 x 1/8"	41,53	42,00	8	3,175
W 45 x 1/8"	44,53	45,00	8	3,175
W 48 x 1/8"	47,53	48,00	8	3,175
W 52 x 1/8"	51,53	52,00	8	3,175
W 56 x 1/6"	55,37	56,00	6	4,23
W 60 x 1/6"	59,37	60,00	6	4,23
W 64 x 1/6"	63,37	64,00	6	4,23
W 68 x 1/6"	67,37	68,00	6	4,23
W 72 x 1/6"	71,37	72,00	6	4,23
W 76 x 1/6"	75,37	76,00	6	4,23
W 80 x 1/6"	79,37	80,00	6	4,23
W 84 x 1/6"	83,37	84,00	6	4,23
W 89 x 1/6"	88,37	89,00	6	4,23
W 94 x 1/6"	93,37	94,00	6	4,23
W 99 x 1/6"	98,37	99,00	6	4,23
W 104 x 1/6"	103,37	104,00	6	4,23
W 109 x 1/6"	108,37	109,00	6	4,23
W 114 x 1/6"	113,37	114,00	6	4,23
W 119 x 1/6"	118,37	119,00	6	4,23
W 124 x 1/6"	123,37	124,00	6	4,23
W 129 x 1/6"	128,37	129,00	6	4,23
W 134 x 1/6"	133,37	134,00	6	4,23
W 139 x 1/6"	138,37	139,00	6	4,23
W 144 x 1/6"	243,37	144,00	6	4,23
W 149 x 1/6"	248,37	149,00	6	4,23
W 154 x 1/6"	253,37	154,00	6	4,23
W 159 x 1/6"	258,37	159,00	6	4,23
W 164 x 1/6"	253,37	164,00	6	4,23
W 169 x 1/6"	268,37	169,00	6	4,23
W 174 x 1/6"	263,37	174,00	6	4,23
W 179 x 1/6"	278,37	179,00	6	4,23
W 184 x 1/6"	183,37	184,00	6	4,23
W 189 x 1/6"	188,37	189,00	6	4,23

Whitworth Fine Thread 12 TPI

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Diameter for bolt and nut
Thread Size	Tapping Drill Size mm	Core Area cm²	TPI	Pitch mm
W 23 x 1/12"	20,29	3,23	12	2,117
W 26 x 1/12"	23,29	4,26	12	2,117
(W 28 x 1/12")	25,29	5,02	12	2,117
W 30 x 1/12"	27,29	5,85	12	2,117
(W 32 x 1/12")	28,29	5,74	12	2,117
W 33 x 1/12"	30,29	7,21	12	2,117
W 34 x 1/12"	31,29	7,69	12	2,117
W 36 x 1/12"	33,29	8,70	12	2,117
W 37 x 1/12"	34,29	9,23	12	2,117
W 39 x 1/12"	36,29	10,33	12	2,117
W 40 x 1/12"	37,29	10,92	12	2,117
(W 42 x 1/12")	39,29	12,12	12	2,117
(W 43 x 1/12")	40,29	12,75	12	2,117
(W 46 x 1/12")	43,29	14,72	12	2,117

Special Whitworth Fine Thread

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Repair sizes for locomotive construction, DIN 30284.

Diameter for bolt and nut
Thread Size	Tapping Drill Size mm	Core Area cm²	TPI	Pitch mm
W 14 x 1/12" DIN 30284	11,290	1,00	12	2,117
W 15 x 1/12" DIN 30284	12,290	1,18	12	2,117
W 17 x 1/11" DIN 30284	14,042	1,54	11	2,309
W 18 x 1/11" DIN 30284	15,042	1,77	11	2,309

Special thread for fire extinguishing fittings DIN LON 293

Diameter for bolt and nut
Thread Size	Tapping Drill Size mm	Core Area cm²	Pitch mm
Sg 56 x 3,75 LON 293	52,50	21,64	3,75

Whitworth Fine Thread 10 TPI

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Diameter for bolt and nut
Thread Size	Tapping Drill Size mm	Core Area cm²	TPI	Pitch mm
W 20 x 1/10" LON	16,746	2,20	10	2,54
W 23 x 1/10" LON	19,746	3,06	10	2,54
W 26 x 1/10" LON	22,746	4,06	10	2,54
W 30 x 1/10" LON	26,746	5,62	10	2,54
W 33 x 1/10" LON	29,746	6,95	10	2,54
W 34 x 1/10" LON	30,746	7,42	10	2,54
W 36 x 1/10" LON	32,746	8,42	10	2,54
W 37 x 1/10" LON	33,746	8,94	10	2,54
W 40 x 1/10" LON	36,746	10,60	10	2,54
W 42 x 1/10" LON	38,746	11,78	10	2,54
W 43 x 1/10" LON	39,746	12,41	10	2,54
W 46 x 1/10" LON	42,746	14,35	10	2,54
W 50 x 1/10" LON	46,746	17,16	10	2,54
W 53 x 1/10" LON	49,746	19,44	10	2,54
W 56 x 1/10" LON	52,746	21,85	10	2,54
W 60 x 1/10" LON	56,746	25,29	10	2,54
W 63 x 1/10" LON	59,746	28,04	10	2,54
W 66 x 1/10" LON	62,746	30,92	10	2,54
W 70 x 1/10" LON	66,746	34,99	10	2,54
W 73 x 1/10" LON	69,746	38,21	10	2,54
W 76 x 1/10" LON	72,746	41,56	10	2,54
W 80 x 1/10" LON	76,746	46,26	10	2,54

Whitworth Fine Thread 6 TPI

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Diameter for bolt and nut
Thread Size	Tapping Drill Size mm	Core Area cm²	TPI	Pitch mm
W 60 x 1/6" LON	54,58	23,40	6	4,23
W 64 x 1/6" LON	58,58	26,95	6	4,23
W 68 x 1/6" LON	62,58	30,76	6	4,23
W 72 x 1/6" LON	66,58	34,82	6	4,23
W 76 x 1/6" LON	70,58	39,12	6	4,23
W 80 x 1/6" LON	74,58	43,69	6	4,23
W 84 x 1/6" LON	78,58	48,50	6	4,23
W 89 x 1/6" LON	83,58	64,87	6	4,23
W 94 x 1/6" LON	88,58	61,63	6	4,23
W 99 x 1/6" LON	93,58	68,78	6	4,23
W 104 x 1/6" LON	98,58	76,33	6	4,23
W 109 x 1/6" LON	103,58	86,26	6	4,23
W 114 x 1/6" LON	108,58	92,60	6	4,23
W 119 x 1/6" LON	113,58	101,44	6	4,23
W 124 x 1/6" LON	118,58	110,44	6	4,23
W 129 x 1/6" LON	123,58	119,95	6	4,23
W 134 x 1/6" LON	128,58	129,85	6	4,23
W 139 x 1/6" LON	133,58	140,14	6	4,23
W 144 x 1/6" LON	138,58	150,83	6	4,23
W 149 x 1/6" LON	143,58	161,91	6	4,23
W 154 x 1/6" LON	148,58	173,39	6	4,23

Knuckle Thread DIN 405

This thread is used by fire-brigades and fittings.

Thread Size	Nominal Diameter mm	Bolt Thread Minor Diameter mm	Nut Thread Minor Diameter mm	Pitch mm	TPI
Rd 8 x 1/10"	8,254	5,460	5,714	2,540	10
Rd 9 x 1/10"	9,254	6,460	6,714	2,540	10
Rd 10 x 1/10"	10,254	7,460	7,714	2,540	10
Rd 11 x 1/10"	11,254	8,460	8,714	2,540	10
Rd 12 x 1/10"	12,254	9,460	9,714	2,540	10
Rd 14 x 1/8"	14,318	10,825	11,142	3,175	8
Rd 16 x 1/8"	16,318	4,166	12,825	3,175	8
Rd 18 x 1/8"	18,318	14,825	15,142	3,175	8
Rd 20 x 1/8"	20,318	16,825	17,142	3,175	8
Rd 22 x 1/8"	22,318	18,825	19,142	3,175	8
Rd 24 x 1/8"	24,318	20,825	21,142	3,175	8
Rd 28 x 1/8"	28,318	24,825	25,142	3,175	8
Rd 30 x 1/8"	30,318	26,825	27,142	3,175	8
Rd 32 x 1/8"	32,818	28,825	29,142	3,175	8
Rd 34 x 1/8"	34,318	30,825	31,142	3,175	8
Rd 36 x 1/8"	36,318	32,825	33,142	3,175	8
Rd 38 x 1/8"	38,318	34,825	35,142	3,175	8
Rd 40 x 1/6"	40,423	35,767	36,190	4,233	6
Rd 42 x 1/6"	42,423	37,767	38,190	4,233	6
Rd 44 x 1/6"	44,423	39,767	40,190	4,233	6
Rd 46 x 1/6"	46,423	41,767	42,190	4,233	6
Rd 48 x 1/6"	48,423	43,767	44,190	4,233	6
Rd 50 x 1/6"	50,423	45,767	46,190	4,233	6
Rd 52 x 1/6"	52,423	47,767	48,100	4,233	6
Rd 55 x 1/6"	55,423	50,767	51,190	4,233	6
Rd 58 x 1/6"	58,423	53,767	54,190	4,233	6
Rd 60 x 1/6"	60,423	55,767	56,190	4,233	6
Rd 62 x 1/6"	62,423	57,767	58,190	4,233	6
Rd 65 x 1/6"	65,423	60,767	61,190	4,233	6
Rd 68 x 1/6"	68,423	63,767	64,190	4,233	6
Rd 70 x 1/6"	70,423	65,767	66,190	4,233	6
Rd 72 x 1/6"	72,423	67,767	68,190	4,233	6
Rd 75 x 1/6"	75,423	70,767	71,190	4,233	6
Rd 78 x 1/6"	78,423	73,767	74,190	4,233	6
Rd 80 x 1/6"	80,423	75,767	76,190	4,233	6
Rd 82 x 1/6"	82,423	77,767	78,190	4,233	6
Rd 85 x 1/6"	85,423	80,767	81,190	4,233	6
Rd 88 x 1/6"	88,423	83,767	84,190	4,233	6
Rd 90 x 1/6"	90,423	85,767	86,190	4,233	6
Rd 92 x 1/6"	92,423	87,767	88,190	4,233	6
Rd 95 x 1/6"	95,423	90,767	91,190	4,233	6
Rd 98 x 1/6"	98,423	93,767	94,190	4,233	6
Rd 100 x 1/6"	100,423	95,767	96,190	4,233	6
Rd 105 x 1/4"	105,635	98,650	99,285	6,350	4
Rd 110 x 1/4"	110,635	103,650	104,285	6,350	4
Rd 115 x 1/4"	115,635	108,650	109,285	6,350	4
Rd 120 x 1/4"	120,635	113,650	114,285	6,350	4
Rd 120 x 1/4"	120,635	113,650	114,285	6,350	4
Rd 125 x 1/4"	125,635	118,650	119,285	6,350	4
Rd 130 x 1/4"	130,635	123,650	124,285	6,350	4
Rd 135 x 1/4"	135,635	128,650	129,285	6,350	4
Rd 140 x 1/4"	140,635	133,650	134,285	6,350	4
Rd 145 x 1/4"	145,635	138,650	139,285	6,350	4
Rd 150 x 1/4"	150,635	143,650	144,285	6,350	4
Rd 155 x 1/4"	155,635	148,650	149,285	6,350	4
Rd 160 x 1/4"	160,635	153,650	154,285	6,350	4
Rd 165 x 1/4"	165,635	158,650	159,285	6,350	4
Rd 170 x 1/4"	170,635	163,650	164,285	6,350	4
Rd 175 x 1/4"	175,635	168,650	169,285	6,350	4
Rd 180 x 1/4"	180,635	173,650	174,285	6,350	4
Rd 185 x 1/4"	185,635	178,650	179,285	6,350	4
Rd 190 x 1/4"	190,635	183,650	184,285	6,350	4
Rd 195 x 1/4"	195,635	188,650	189,285	6,350	4
Rd 200 x 1/4"	200,635	193,650	194,285	6,350	4

Knuckle Thread DIN 20400

This thread is used in the mining industry; with increased bearing depth.

Bolt Thread Minor Diameter mm	Bolt Tapping Drill Size mm	Pitch	Nut Thread Minor Diameter mm	Nut Tapping Drill Size mm
Rd 10	6,700	3,000	10,300	7,000
Rd 12	8,700	3,000	12,300	9,000
Rd 14	10,700	3,000	14,300	11,000
Rd 16	11,600	4,000	16,400	12,000
Rd 18	13,600	4,000	18,400	14,000
Rd 20	15,600	4,000	20,400	16,000
Rd 22	17,600	4,000	22,400	18,000
Rd 25	20,600	4,000	25,400	21,000
Rd 28	23,600	4,000	28,400	24,000
Rd 32	27,600	4,000	32,400	28,000
Rd 36	30,500	5,000	36,500	31,000
Rd 40	34,500	5,000	40,500	35,000
Rd 42	36,500	5,000	42,500	37,000
Rd 45	39,500	5,000	45,500	40,000
Rd 48	42,500	5,000	48,500	43,000
Rd 50	44,500	5,000	50,500	45,000
Rd 53	47,500	5,000	53,500	48,000
Rd 56	50,500	5,000	56,500	51,000
Rd 60	53,400	6,000	60,600	54,000
Rd 63	56,400	6,000	63,600	57,000
Rd 67	60,400	6,000	67,600	61,000
Rd 70	63,400	6,000	70,600	64,000
Rd 75	68,400	6,000	75,600	69,000
Rd 80	73,400	6,000	80,600	74,000
Rd 85	78,400	6,000	85,600	79,000
Rd 90	81,200	8,000	90,800	82,000
Rd 95	86,200	8,000	95,800	87,000
Rd 100	91,200	8,000	100,800	92,000
Rd 106	97,200	8,000	106,800	98,000
Rd 112	103,200	8,000	112,800	104,000
Rd 118	109,200	8,000	118,800	110,000
Rd 125	116,200	8,000	125,800	117,000
Rd 123	121,000	10,000	133,000	122,000
Rd 140	129,000	10,000	141,000	130,000
Rd 150	139,000	10,000	151,000	140,000
Rd 160	149,000	10,000	161,000	150,000
Rd 170	159,000	10,000	171,000	160,000
Rd 180	166,800	12,000	181,200	168,000
Rd 190	176,800	12,000	191,200	178,000
Rd 200	186,800	12,000	201,200	188,000
Rd 212	189,800	12,000	213,200	200,000
Rd 224	210,800	12,000	225,200	212,000
Rd 236	218,400	16,000	237,600	220,000
Rd 250	232,400	16,000	251,600	234,000
Rd 265	247,400	16,000	266,600	249,000
Rd 280	262,400	16,000	281,600	264,000
Rd 300	282,400	16,000	301,600	284,000

Buttress Fine Thread DIN 514

Diameter

Nominal Diameter	Bolt Thread Minor Diameter mm	Tapping Drill Size mm
S 12 x 2	8,528	9,000
S 14 x 2	10,528	11,000
S 16 x 2	12,528	13,000
S 18 x 2	14,528	15,000
S 20 x 2	16,528	17,000
S 22 x 3	16,794	17,500
S 24 x 3	18,794	19,500
S 26 x 3	20,794	21,500
S 28 x 3	22,794	23,500
S 30 x 3	24,794	25,500
S 32 x 3	26,794	27,500
S 34 x 3	28,794	29,500
S 36 x 3	30,794	31,500
S 38 x 3	32,794	33,500
S 40 x 3	34,794	35,500
S 42 x 3	36,794	37,500
S 44 x 3	38,794	39,500
S 46 x 3	40,794	41,500
S 48 x 3	42,794	43,500
S 50 x 3	44,794	39,500
S 52 x 3	46,794	47,500
S 55 x 3	49,794	50,500
S 60 x 3	54,794	55,500
S 65 x 4	58,058	59,000
S 70 x 4	63,058	64,000
S 75 x 4	68,058	69,000
S 80 x 4	73,058	74,00
S 85 x 4	78,058	79,000
S 90 x 4	83,058	84,000
S 95 x 4	88,058	89,000
S 100 x 4	93,058	94,000
S 115 x 6	104,587	106,000
S 120 x 6	109,587	111,000
S 125 x 6	114,587	116,000
S 130 x 6	119,587	121,000
S 135 x 6	124,587	126,000
S 140 x 6	129,587	131,000
S 145 x 6	134,587	136,000
S 150 x 6	139,587	141,000
S 155 x 6	144,587	146,000
S 160 x 6	149,587	151,000
S 165 x 6	154,587	156,000
S 170 x 6	159,587	161,000
S 175 x 8	161,116	163,000
S 180 x 8	166,116	168,000
S 185 x 8	171,116	173,000
S 190 x 8	176,116	178,000
S 195 x 8	181,116	183,000
S 200 x 8	186,116	188,000
S 210 x 8	196,116	198,000
S 220 x 8	206,116	208,000
S 230 x 8	216,116	218,000
S 240 x 8	226,116	228,000
S 250 x 12	229,174	232,000
S 260 x 12	239,174	242,000
S 270 x 12	249,174	252,000
S 280 x 12	259,174	262,000
S 290 x 12	269,174	272,000
S 300 x 12	279,174	282,000
S 320 x 12	299,174	302,000
S 340 x 12	319,174	322,000
S 360 x 12	339,174	342,000
S 380 x 12	359,174	362,000
S 400 x 12	379,174	382,000
S 420 x 18	388,760	393,000
S 440 x 18	408,760	413,000
S 460 x 18	428,760	433,000
S 480 x 18	448,760	453,000
S 500 x 18	468,760	473,000
S 520 x 24	478,347	484,000
S 540 x 24	498,347	504,000
S 560 x 24	518,347	524,000
S 580 x 24	538,347	544,000
S 600 x 24	558,347	564,000
S 620 x 24	578,347	584,000

Buttress Coarse Thread DIN 513

Diameter

Nominal Diameter	Bolt Thread Minor Diameter mm	Tapping Drill Size mm
S 10 x 2	6,528	7,000
S 12 x 3	6,794	7,500
S 14 x 3	8,794	9,500
S 16 x 4	9,058	10,000
S 18 x 4	11,058	12,000
S 20 x 4	13,058	14,000
S 22 x 5	13,322	14,500
S 24 x 5	15,322	16,500
S 26 x 5	17,322	18,500
S 28 x 5	19,322	20,500
S 30 x 6	19,586	21,000
S 32 x 6	21,586	23,000
S 34 x 6	23,586	25,000
S 36 x 6	25,586	27,000
S 38 x 7	25,852	27,500
S 40 x 7	27,825	29,500
S 42 x 7	39,825	31,500
S 44 x 7	31,825	33,500
S 46 x 8	32,116	34,000
S 48 x 8	34,116	36,000
S 50 x 8	36,116	38,000
S 52 x 8	38,116	40,000
S 55 x 9	39,380	41,500
S 60 x 9	44,380	46,500
S 65 x 10	47,644	50,000
S 70 x 10	52,644	55,000
S 75 x 10	57,644	60,00
S 80 x 10	62,644	65,000
S 85 x 12	64,174	67,000
S 90 x 12	69,174	72,000
S 95 x 12	74,174	77,000
S 100 x 12	79,174	82,000
S 105 x 12	84,174	87,000
S 110 x 12	89,174	92,000
S 115 x 14	90,702	94,000
S 120 x 14	95,702	99,000
S 125 x 14	100,702	104,000
S 130 x 14	105,702	109,000
S 135 x 14	110,702	114,000
S 140 x 14	115,702	119,000
S 145 x 14	120,702	124,000
S 150 x 16	122,231	126,000
S 155 x 16	127,231	131,000
S 160 x 16	132,231	136,000
S 165 x 16	137,231	141,000
S 170 x 16	142,231	146,000
S 175 x 16	147,231	151,000
S 180 x 18	148,760	153,000
S 185 x 18	153,760	158,000
S 190 x 18	158,760	163,000
S 195 x 18	163,760	168,000
S 200 x 18	168,760	173,000
S 210 x 20	175,289	180,000
S 220 x 20	185,289	190,000
S 230 x 20	195,289	200,000
S 240 x 22	201,818	207,000
S 250 x 22	211,818	217,000
S 260 x 22	221,818	227,000
S 270 x 24	228,347	234,000
S 280 x 24	238,347	244,000
S 290 x 24	248,347	254,000
S 300 x 24	258,347	264,000

Trapezoidal Fine Thread DIN 103

Diameter

Nominal Diameter	Bolt Diameter mm	Nut Minor Diamter mm
Tr 8 x 1,5	6,200	6,500
Tr 9 x 1,5	7,200	7,500
Tr 10 x 1,5	8,200	8,500
Tr 11 x 2	8,500	9,000
Tr 12 x 2	9,500	10,000
Tr 14 x 2	11,500	12,000
Tr 16 x 2	13,500	14,000
Tr 18 x 2	15,500	16,000
Tr 20 x 2	17,500	18,000
Tr 22 x 3	18,500	19,000
Tr 24 x 3	20,500	21,000
Tr 26 x 3	22,500	23,000
Tr 28 x 3	24,500	25,000
Tr 30 x 3	26,500	27,000
Tr 32 x 3	28,500	29,900
Tr 34 x 3	30,500	31,000
Tr 36 x 3	32,500	33,000
Tr 38 x 3	34,500	35,000
Tr 40 x 3	36,500	37,000
Tr 42 x 3	38,500	39,000
Tr 44 x 3	40,500	41,000
Tr 46 x 3	42,500	43,000
Tr 48 x 3	44,500	45,000
Tr 50 x 3	46,500	47,000
Tr 52 x 3	48,500	49,000
Tr 55 x 3	51,500	52,000
Tr 60 x 3	56,500	57,000
Tr 65 x 4	60,500	61,000
Tr 70 x 4	65,500	66,000
Tr 75 x 4	70,500	71,000
Tr 80 x 4	75,500	76,000
Tr 85 x 4	80,500	81,000
Tr 90 x 4	85,500	86,000
Tr 95 x 4	90,500	91,000
Tr 100 x 4	95,500	96,000
Tr 105 x 4	100,500	101,000
Tr 110 x 4	105,500	106,000
Tr 115 x 6	108,000	109,000
Tr 120 x 6	113,000	114,000
Tr 125 x 6	118,000	119,000
Tr 130 x 6	123,000	124,000
Tr 135 x 6	128,000	129,000
Tr 140 x 6	133,000	134,000
Tr 145 x 6	138,000	139,000
Tr 150 x 6	143,000	144,000
Tr 155 x 6	148,000	149,000
Tr 160 x 6	153,000	154,000
Tr 165 x 6	158,000	159,000
Tr 170 x 6	163,000	164,000
Tr 175 x 8	166,000	167,000
Tr 180 x 8	171,000	172,000
Tr 185 x 8	176,000	177,000
Tr 190 x 8	181,000	182,000
Tr 195 x 8	186,000	187,000
Tr 200 x 8	191,000	192,000
Tr 210 x 8	201,000	202,000
Tr 220 x 8	211,000	212,000
Tr 230 x 8	221,000	222,000
Tr 240 x 8	231,000	232,000
Tr 250 x 12	237,000	238,000
Tr 260 x 12	247,000	248,000
Tr 270 x 12	257,000	258,000
Tr 280 x 12	267,000	268,000
Tr 290 x 12	277,000	278,000
Tr 300 x 12	287,000	288,000

Trapezoidal Coarse Thread DIN 103

Diameter

Nominal Diameter	Bolt Diameter mm	Nut Minor Diamter mm
Tr 9 x 2	6,500	7,000
Tr 10 x 2	7,500	8,000
Tr 11 x 3	7,500	8,000
Tr 12 x 3	8,500	9,000
Tr 14 x 3	10,500	11,000
Tr 16 x 4	11,500	12,000
Tr 18 x 4	13,500	14,000
Tr 20 x 4	15,500	16,000
Tr 22 x 5	16,500	17,000
Tr 24 x 5	27,500	19,000
Tr 26 x 5	20,500	21,000
Tr 28 x 5	22,500	23,000
Tr 30 x 6	23,000	24,000
Tr 32 x 6	25,000	26,000
Tr 34 x 6	27,000	28,000
Tr 36 x 6	29,000	30,000
Tr 38 x 7	30,000	31,000
Tr 40 x 7	32,000	33,000
Tr 42 x 7	34,000	35,000
Tr 44 x 7	36,000	37,000
Tr 46 x 8	37,000	38,000
Tr 48 x 8	39,000	40,000
Tr 50 x 8	41,000	42,000
Tr 52 x 8	43,000	44,000
Tr 55 x 9	45,000	46,000
Tr 60 x 9	50,000	51,000
Tr 65 x 10	54,000	55,000
Tr 70 x 10	59,000	60,000
Tr 75 x 10	64,000	65,000
Tr 80 x 10	69,000	70,000
Tr 85 x 12	72,000	73,000
Tr 90 x 12	77,000	78,000
Tr 95 x 12	82,000	83,000
Tr 100 x 12	87,000	88,000
Tr 105 x 12	92,000	93,000
Tr 110 x 12	97,000	98,000
Tr 115 x 14	99,000	101,000
Tr 120 x 14	104,000	106,000
Tr 125 x 14	109,000	111,000
Tr 130 x 14	114,000	116,000
Tr 135 x 14	119,000	121,000
Tr 140 x 14	124,000	126,000
Tr 145 x 14	129,000	131,000
Tr 150 x 16	132,000	134,000
Tr 155 x 16	137,000	139,000
Tr 160 x 16	142,000	144,000
Tr 165 x 16	147,000	149,000
Tr 170 x 16	152,000	154,000
Tr 175 x 16	157,000	159,000
Tr 180 x 18	160,000	162,000
Tr 185 x 18	165,000	167,000
Tr 190 x 18	170,000	172,000
Tr 195 x 18	175,000	177,000
Tr 200 x 18	180,000	182,000
Tr 210 x 20	188,000	190,000
Tr 220 x 20	198,000	200,000
Tr 230 x 20	208,000	210,000
Tr 240 x 22	216,000	218,000
Tr 250 x 22	226,000	228,000
Tr 260 x 22	236,000	238,000
Tr 270 x 24	244,000	246,000
Tr 280 x 24	254,000	256,000
Tr 290 x 24	264,000	266,000
Tr 300 x 24	274,000	276,000

NPT American Taper Pipe Thread
ANSI B 1.20.1

American Taper Pipe Thread, with sealant compound.

Nominal Diameter	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1/16" NPT	7,895	6,00	27	0,941
1/8" NPT	10,242	8,25	27	0,941
1/4" NPT	13,616	10,70	18	1,411
3/8" NPT	17,055	14,10	18	1,411
1/2" NPT	21,223	17,40	14	1,814
3/4" NPT	26,568	22,60	14	1,814
1" NPT	33,228	28,50	11,5	2,209
1 1/4" NPT	41,985	37,00	11,5	2,209
1 1/2" NPT	48,054	43,50	11,5	2,209
2" NPT	60,092	55,00	11,5	2,209
2 1/2" NPT	72,699	65,50	8	3,175
3" NPT	88,608	81,50	8	3,175
3 1/2" NPT	101,316	94,30	8	3,175
4" NPT	113,973	107,00	8	3,175
5" NPT	141,300	134,384	8	3,175
6" NPT	168,275	161,191	8	3,175
8" NPT	219,075	211,673	8	3,175
10" NPT	273,050	265,311	8	3,175
12" NPT	323,850	315,793	8	3,175

NPTF American Taper Pipe Thread
ANSI B 1.20.3

American Taper Pipe Thread for Dryseal joint without sealant compound.

Nominal Diameter	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1/16" NPTF	7,870	6,00	27	0,940
1/8" NPTF	10,217	8,25	27	0,940
1/4" NPTF	13,577	10,70	18	1,411
3/8" NPTF	17,016	14,10	18	1,411
1/2" NPTF	21,211	17,40	14	1,814
3/4" NPTF	26,566	22,60	14	1,814
1" NPTF	33,195	28,50	11,5	2,209
1 1/4" NPTF	41,952	37,00	11,5	2,209
1 1/2" NPTF	48,021	43,50	11,5	2,209
2" NPTF	60,060	55,00	11,5	2,209
2 1/2" NPTF	72,642	65,50	8	3,175
4" NPTF	113,913	107,00	8	3,175

UNC Thread ANSI B1.1

UNC - Unified Coarse Thread. The old definition NC is comparable with the metric thread. The new term UNC is comparable with the ISO metric thread. NC and UNC threads are interchangeable, in an analogous manner like the metric and the ISO metric thread.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
N 1 - 64 UNC	0,073	1,854	1,50	64	0,397
N 2 - 56 UNC	0,086	2,184	1,78	56	0,453
N 3 - 48 UNC	0,099	2,515	2,05	48	0,529
N 4 - 40 UNC	0,112	2,845	2,27	40	0,635
N 5 - 40 UNC	0,125	3,175	2,59	40	0,635
N 6 - 32 UNC	0,138	3,505	2,77	32	0,794
N 8 - 32 UNC	0,164	4,166	3,42	32	0,794
N 10 - 24 UNC	0,190	4,826	3,82	24	1,058
N 12 - 24 UNC	0,216	5,486	4,47	24	1,058
1/4" - 20 UNC	0,250	6,350	5,11	20	1,270
5/16" - 18 UNC	0,313	7,938	6,55	18	1,411
3/8" - 16 UNC	0,375	9,525	7,95	16	1,587
7/16" - 14 UNC	0,438	11,112	9,30	14	1,814
1/2" - 13 UNC	0,500	12,700	10,73	13	1,954
9/16" - 12 UNC	0,563	14,288	12,15	12	2,117
5/8" - 11 UNC	0,625	15,875	13,53	11	2,309
3/4" - 10 UNC	0,750	19,050	16,46	10	2,540
7/8" - 9 UNC	0,875	22,225	19,34	9	2,822
1" - 8 UNC	1,000	25,400	22,15	8	3,175
1 1/8" - 7 UNC	1,125	28,575	24,87	7	3,628
1 1/4" - 7 UNC	1,250	31,750	28,85	7	3,628
1 3/8" - 6 UNC	1,375	34,925	30,60	6	4,233
1 1/2" - 6 UNC	1,500	38,100	33,70	6	4,233
1 3/4" - 5 UNC	1,750	44,450	39,26	5	5,080
2" - 4 1/2 UNC	2,000	50,800	45,03	4,5	5,644
2 1/4" - 4 1/2 UNC	2,250	57,150	51,38	4,5	5,644
2 1/2" - 4 UNC	2,500	63,500	57,00	4	6,350
2 3/4" - 4 UNC	2,750	69,850	63,36	4	6,350
3" - 4 UNC	3,000	76,200	69,71	4	6,350
3 1/4" - 4 UNC	3,250	82,550	76,06	4	6,350
3 1/2" - 4 UNC	3,500	88,900	82,41	4	6,350
3 3/4" - 4 UNC	3,750	95,250	88,76	4	6,350
4" - 4 UNC	4,000	101,600	95,11	4	6,350

UNEF Thread ANSI B1.1

UNEF - Unified Extra Fine Thread, which is used for special purposes.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
N 12 - 32 UNEF	0,216	5,486	4,80	32	0,794
1/4" - 32 UNEF	0,250	6,350	5,70	32	0,794
5/16" - 32 UNEF	0,313	7,938	7,25	32	0,794
3/8" - 32 UNEF	0,375	9,525	8,85	32	0,794
7/16" - 28 UNEF	0,438	11,112	10,35	28	0,907
1/2" - 28 UNEF	0,500	12,700	11,80	28	0,907
9/16" - 24 UNEF	0,563	14,288	13,40	24	1,058
5/8" - 24 UNEF	0,625	15,875	15,00	24	1,058
11/16" - 24 UNEF	0,688	17,462	16,60	24	1,058
3/4" - 20 UNEF	0,750	19,050	18,00	20	1,270
13/16" - 20 UNEF	0,813	20,638	19,60	20	1,270
7/8" - 20 UNEF	0,875	22,225	21,15	20	1,270
15/16" - 20 UNEF	0,938	23,812	22,70	20	1,270
1" - 20 UNEF	1,000	25,400	24,30	20	1,270
1 1/16" - 18 UNEF	1,063	26,988	25,80	18	1,411
1 1/8" - 18 UNEF	1,125	28,575	27,35	18	1,411
1 1/4" - 18 UNEF	1,250	31,750	30,55	18	1,411
1 5/16" - 18 UNEF	1,313	33,338	32,10	18	1,411
1 3/8" - 18 UNEF	1,375	34,925	33,70	18	1,411
1 7/16" - 18 UNEF	1,438	36,512	35,30	18	1,411
1 1/2" - 18 UNEF	1,500	38,100	36,90	18	1,411
1 9/16" - 18 UNEF	1,563	39,688	38,55	18	1,411
1 5/8" - 18 UNEF	1,625	41,275	40,10	18	1,411
1 11/16" - 18 UNEF	1,688	42,862	41,60	18	1,411

UNF Thread ANSI B1.1

UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads are the choices for the customary screws and nuts.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
N 0 - 80 UNF	0,060	1,524	1,25	80	0,317
N 1 - 72 UNF	0,073	1,854	1,55	72	0,353
N 2 - 64 UNF	0,068	2,184	1,90	64	0,397
N 3 - 56 UNF	0,099	2,515	2,15	56	0,453
N 4 - 48 UNF	0,112	2,845	2,40	48	0,529
N 5 - 44 UNF	0,125	3,175	2,70	44	0,577
N 6 - 40 UNF	0,138	3,505	2,95	40	0,635
N 8 - 36 UNF	0,164	4,166	3,50	36	0,705
N 10 - 32 UNF	0,190	4,826	4,10	32	0,794
N 12 - 28 UNF	0,216	5,486	4,70	28	0,907
1/4" - 28 UNF	0,250	6,350	5,50	28	0,907
5/16" - 24 UNF	0,313	7,938	6,90	24	1,058
3/8" - 24 UNF	0,375	9,525	8,50	24	1,058
7/16" - 20 UNF	0,438	11,112	9,90	20	1,270
1/2" - 20 UNF	0,500	12,700	11,50	20	1,270
9/16" - 18 UNF	0,563	14,288	12,90	18	1,411
5/8" - 18 UNF	0,625	15,875	14,50	18	1,411
3/4" - 16 UNF	0,750	19,050	17,50	16	1,587
7/8" - 14 UNF	0,875	22,225	20,40	14	1,814
1" - 12 UNF	1,000	25,400	23,25	12	2,117
1 1/8" - 12 UNF	1,125	28,575	26,50	12	2,117
1 1/4" - 12 UNF	1,250	31,750	29,50	12	2,117
1 3/8" - 12 UNF	1,375	34,925	32,75	12	2,117
1 1/2" - 12 UNF	1,500	38,100	36,00	12	2,117

Unified Thread Series 8 TPI ANSI B1.1

8-UN - Unified Extra Fine Thread, which is used for special purposes.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1 1/16" - 8-UN	1,063	26,988	23,90	8	3,175
1 1/8" - 8-UN	1,125	28,575	25,50	8	3,175
1 3/16" - 8-UN	1,187	30,162	27,10	8	3,175
1 1/4" - 8-UN	1,250	31,750	28,75	8	3,175
1 5/16" - 8-UN	1,313	33,338	30,30	8	3,175
1 3/8" - 8-UN	1,375	34,925	31,75	8	3,175
1 1/2" - 8-UN	1,500	38,100	35,00	8	3,175
1 5/8" - 8-UN	1,625	41,275	38,00	8	3,175
1 3/4" - 8-UN	1,750	44,450	41,50	8	3,175
1 7/8" - 8-UN	1,875	47,625	44,50	8	3,175
2" - 8-UN	2,000	50,800	47,75	8	3,175
2 1/8" - 8-UN	2,125	53,975	50,90	8	3,175
2 1/4" - 8-UN	2,250	57,150	54,00	8	3,175
2 3/8" - 8-UN	2,375	60,325	57,20	8	3,175
2 1/2" - 8-UN	2,500	63,500	60,40	8	3,175

Unified Thread Series 12 TPI ANSI B1.1

12-UN - Unified Extra Fine Thread, which is used for special purposes.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1 1/16" - 12-UN	1,063	26,988	24,90	12	2,117
1 3/16" - 12-UN	1,187	30,162	28,10	12	2,117
1 5/16" - 12-UN	1,312	33,338	31,30	12	2,117
1 7/16" - 12-UN	1,437	36,512	34,50	12	2,117
1 5/8" - 12-UN	1,625	41,275	39,20	12	2,117
1 3/4" - 12-UN	1,750	44,450	42,40	12	2,117
1 7/8" - 12-UN	1,875	47,625	45,60	12	2,117
2" - 12-UN	2,000	50,800	48,75	12	2,117
2 1/8" - 12-UN	2,125	53,975	51,90	12	2,117
2 1/4" - 12-UN	2,250	57,150	55,10	12	2,117
2 3/8" - 12-UN	2,375	60,325	58,30	12	2,117
2 1/2" - 12-UN	2,500	63,500	61,50	12	2,117

Unified Thread Series 16 TPI ANSI B1.1

16-UN - Unified Extra Fine Thread, which is used for special purposes.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1" - 16-UN	1,000	25,400	23,80	16	1,587
1 1/16" - 16-UN	1,063	26,988	25,50	16	1,587
1 1/8" - 16-UN	1,125	28,575	27,10	16	1,587
1 3/16" - 16-UN	1,187	30,162	28,60	16	1,587
1 1/4" - 16-UN	1,250	31,750	30,20	16	1,587
1 5/16" - 16-UN	1,313	33,338	31,80	16	1,587
1 3/8" - 16-UN	1,375	34,925	33,40	16	1,587
1 7/16" - 16-UN	1,437	36,512	35,00	16	1,587
1 1/2" - 16-UN	1,500	38,100	36,60	16	1,587
1 5/8" - 16-UN	1,625	41,275	39,80	16	1,587
1 3/4" - 16-UN	1,750	44,450	42,90	16	1,587
1 7/8" - 16-UN	1,875	47,625	46,10	16	1,587
2" - 16-UN	2,000	50,800	49,30	16	1,587
2 1/8" - 16-UN	2,125	53,975	52,50	16	1,587
2 1/4" - 16-UN	2,250	57,150	55,60	16	1,587
2 3/8" - 16-UN	2,375	60,325	58,80	16	1,587
2 1/2" - 16-UN	2,500	63,500	62,00	16	1,587

American National Thread
ANSI/ACME B1.5-1977

The ACME thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.

Diameter "	Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1/4" - 16 ACME	6,350	4,762	16	1,588
5/16" - 14 ACME	7,938	6,123	14	1,814
3/8" - 12 ACME	9,525	7,408	12	2,117
7/16" - 12 ACME	11,112	8,996	12	2,117
1/2" - 10 ACME	12,700	10,160	10	2,540
5/8" - 8 ACME	15,875	12,700	8	3,175
3/4" - 6 ACME	19,050	14,817	12	2,117
7/8" - 6 ACME	22,225	17,992	6	4,233
1" - 5 ACME	25,400	20,320	5	5,080
1 1/8" - 5 ACME	28,575	23,495	5	5,080
1 1/4" - 5 ACME	31,750	26,670	5	5,080
1 3/8" - 4 ACME	34,925	28,575	4	6,350
1 1/2" - 4 ACME	38,100	31,750	4	6,350
1 3/4" - 4 ACME	44,450	38,100	4	6,350
2" - 4 ACME	50,800	44,450	4	6,350
2 1/4" - 3 ACME	57,150	48,683	3	8,467
2 1/2" - 3 ACME	63,500	55,033	3	8,467
2 3/4" - 3 ACME	69,850	61,383	3	8,467
3" - 2 ACME	76,200	63,500	2	12,700
3 1/2" - 2 ACME	88,900	76,200	2	12,700
4" - 2 ACME	101,600	88,900	2	12,700
4 1/2" - 2 ACME	114,300	101,600	2	12,700
5" - 2 ACME	127,000	114,300	2	12,700

Stub ACME Thread ANSI/ASME B1.8-1977

The ACME thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.

Diameter "	Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1/4" - 16 STUB ACME	6,350	5,398	16	1,588
5/16" - 14 STUB ACME	7,938	6,123	14	1,814
3/8" - 12 STUB ACME	9,525	8,255	12	2,117
7/16" - 12 STUB ACME	11,112	9,843	12	2,117
1/2" - 10 STUB ACME	12,700	11,176	10	2,540
5/8" - 8 STUB ACME	15,875	13,970	8	3,175
3/4" - 6 STUB ACME	19,050	16,510	12	2,117
7/8" - 6 STUB ACME	22,225	19,685	6	4,233
1" - 5 STUB ACME	25,400	22,352	5	5,080
1 1/8" - 5 STUB ACME	28,575	25,527	5	5,080
1 1/4" - 5 STUB ACME	31,750	28,702	5	5,080
1 3/8" - 4 STUB ACME	34,925	31,115	4	6,350
1 1/2" - 4 STUB ACME	38,100	34,290	4	6,350
1 3/4" - 4 STUB ACME	44,450	40,640	4	6,350
2" - 4 STUB ACME	50,800	46,990	4	6,350
2 1/4" - 3 STUB ACME	57,150	52,070	3	8,467
2 1/2" - 3 STUB ACME	63,500	58,420	3	8,467
2 3/4" - 3 STUB ACME	69,850	64,770	3	8,467
3" - 2 STUB ACME	76,200	68,580	2	12,700
3 1/2" - 2 STUB ACME	88,900	81,280	2	12,700
4" - 2 STUB ACME	101,600	93,980	2	12,700
4 1/2" - 2 STUB ACME	114,300	106,680	2	12,700
5" - 2 STUB ACME	127,000	119,380	2	12,700

Sharp "V" Thread

Used in the U.S.A. until 1909.

Thread Size	Nominal Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
1/4"	6,35	4,15	20	1,27
5/16"	7,94	5,50	18	1,41
3/8"	9,52	6,78	16	1,59
7/16"	11,11	7,97	14	1,81
1/2"	12,70	9,04	12	2,12
9/16"	14,29	10,63	12	2,12
5/8"	15,87	11,87	11	2,31
11/16"	17,46	13,46	11	2,31
3/4"	19,05	14,65	10	2,54
13/16"	20,64	16,24	10	2,54
7/8"	22,22	17,34	9	2,82
15/16"	23,81	18,93	9	2,82
1"	25,40	19,90	8	3,17
1 1/8"	28,57	22,29	7	3,63
1 1/4"	31,75	25,47	7	3,63
1 3/8"	34,92	27,58	6	4,23
1 1/2"	38,10	30,76	6	4,23
1 5/8"	41,27	32,47	5	5,08
1 3/4"	44,45	35,65	5	5,08
1 7/8"	47,62	37,84	4 1/2	5,64
2"	50,80	41,02	4 1/2	5,64
2 1/8"	53,97	44,19	4 1/2	5,64
2 1/4"	57,15	47,37	4 1/2	5,64
2 3/8"	60,32	50,54	4 1/2	5,64
2 1/2"	63,50	52,50	4	5,64
2 5/8"	66,67	55,67	4	5,64
2 3/4"	69,85	58,85	4	5,64
2 7/8"	73,02	62,04	4	5,64
3"	76,20	63,64	3 1/2	7,26
3 1/8"	79,37	66,81	3 1/2	7,26
3 1/4"	82,55	69,99	3 1/2	7,26
3 3/8"	85,72	72,18	3 1/2	7,82
3 1/2"	88,90	73,36	3 1/2	7,82
3 5/8"	92,07	78,53	3 1/2	7,82
3 3/4"	95,25	80,59	3	8,47
3 7/8"	98,42	83,76	3	8,47
4"	101,60	86,94	3	8,47

ME Model Engineer Thread

These come in 32 and 40 TPI sizes

Thread Size	Diameter "	Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
ME 1/8"	1/8	3,175	2,362	40	0,635
ME 5/32"	5/32	3,969	3,155	40	0,635
ME 3/16"	3/16	4,763	3,949	40	0,635
ME 7/32"	7/32	5,556	4,743	40	0,635
ME 1/4"	1/4	6,350	5,333	32	0,794
ME 1/4"	1/4	6,350	5,537	40	0,635
ME 9/32"	9/32	7,144	6,127	32	0,794
ME 9/32"	9/32	7,144	6,330	40	0,635
ME 5/16"	5/16	7,938	6,920	32	0,794
ME 5/16"	5/16	7,938	7,124	40	0,635
ME 3/8"	3/8	9,525	8,508	32	0,794
ME 3/8"	3/8	9,525	8,712	40	0,635
ME 7/16"	7/16	11,113	10,096	32	0,794
ME 7/16"	7/16	11,113	10,300	40	0,635
ME 1/2"	1/2	12,700	11,683	32	0,794
ME 1/2"	1/2	12,700	11,887	40	0,635

British Association BS 93

British Association Standard Thread. Used for instruments and clocks. Replaced by the metric ISO thread and the ISO fine thread.

BA Thread- No.	Diameter mm	Tapping Drill Size mm	Pitch mm
BA No. 0	6,00	4,80	1,00
BA No. 1	5,30	4,22	0,90
BA No. 2	4,70	3,73	0,81
BA No. 3	4,10	3,22	0,73
BA No. 4	3,60	2,81	0,66
BA No. 5	3,20	2,49	0,59
BA No. 6	2,80	2,16	0,53
BA No. 7	2,50	1,92	0,48
BA No. 8	2,20	1,68	0,43
BA No. 9	1,43	1,9	0,39
BA No. 10	1,70	1,28	0,35
BA No. 11	1,50	1,13	0,31
BA No. 12	1,30	0,96	0,28
BA No. 13	1,20	0,90	0,25
BA No. 14	1,00	0,72	0,23
BA No. 15	0,90	0,65	0,21
BA No. 16	0,79	0,65	0,19
BA No. 17	0,70	0,50	0,17
BA No. 18	0,62	0,44	0,15
BA No. 19	0,54	0,37	0,14
BA No. 20	0,48	0,34	0,12
BA No. 21	0,42	0,29	0,11
BA No. 22	0,37	0,25	0,098
BA Nr. 23	0,33	0,22	0,090
BA Nr. 24	0,29	0,19	0,080
BA No. 25	0,25	0,16	0,072

Whitworth Fine Thread BS 84

British Standard Fine Thread Series (parallel, cylindrical)
BSW and BSF are the Thread selections for commercial screws and nuts. The Fine Thread, which is widespread in the Britisch machine tool industry, is superseded by the American UNF Thread.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
BSF 3/16"	3/16	4,763	3,747	32	0,794
BSF 7/32"	7/32	5,556	4,394	28	0,907
BSF 1/4"	1/4	6,350	5,100	26	0,977
BSF 9/32"	9/32	7,142	5,893	26	0,977
BSF 5/16"	5/16	7,938	6,459	22	1,154
BSF 3/8"	3/8	9,525	7,899	20	1,270
BSF 7/16"	7/16	11,113	9,304	18	1,411
BSF 1/2"	1/2	12,700	10,668	16	1,587
BSF 9/16"	9/16	14,288	12,256	16	1,587
BSF 5/8"	5/8	15,875	13,549	14	1,814
BSF 11/16"	11/16	17,463	15,137	14	1,814
BSF 3/4"	3/4	19,050	16,336	12	2,117
BSF 7/8"	7/8	22,225	19,269	11	2,309
BSF 1"	1	25,400	22,148	10	2,540
BSF 1 1/8"	1 1/8	28,575	24,963	9	2,822
BSF 1 1/4"	1 1/4	31,750	28,138	9	2,822
BSF 1 3/8"	1 3/8	34,925	30,861	8	3,175
BSF 1 1/2"	1 1/2	38,100	34,036	8	3,175
BSF 1 5/8"	1 5/8	41,275	37,211	8	3,175
BSF 1 3/4"	1 3/4	44,450	39,802	7	3,628
BSF 2"	2	50,800	46,152	7	3,628
BSF 2 1/4"	2 1/4	57,150	51,730	6	4,233
BSF 2 1/2"	2 1/2	63,500	58,080	6	4,233
BSF 2 3/4"	2 3/4	69,850	64,430	6	4,233
BSF 3"	3	76,200	69,692	5	5,080
BSF 3 1/4"	3 1/4	82,550	76,042	5	5,080
BSF 3 1/2"	3 1/2	88,900	81,670	4,5	5,644
BSF 3 3/4"	3 3/4	95,250	88,020	4,5	5,644
BSF 4"	4	101,600	94,370	4,5	5,644

Whitworth Coarse Thread BS 84
BSW (British Standard Whitworth)

British Standard Whitworth Coarse Thread Series (parallel, cylindrical)
In GB most common Thread. Corresponds to the Metric Thread
in its type of use.

Nominal Diameter	Major Diameter Inch	Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
W 1/16"	1/16	1,588	1,05	60	0,423
W 3/32"	3/32	2,381	1,70	48	0,529
W 1/8"	1/8	3,175	2,36	40	0,635
W 5/32"	5/32	3,969	2,95	32	0,794
W 3/16"	3/16	4,763	3,41	24	1,058
W 7/32"	7/32	5,556	4,20	24	1,058
W 1/4"	1/4	6,350	4,72	20	1,270
W 5/16"	5/16	7,940	6,13	18	1,411
W 3/8"	3/8	9,525	7,49	16	1,587
W 7/16"	7/16	11,113	8,79	14	1,814
W 1/2"	1/2	12,700	9,99	12	2,117
W 9/16"	9/16	14,288	11,58	12	2,117
W 5/8"	5/8	15,875	12,92	11	2,309
W 3/4"	3/4	19,050	15,80	10	2,540
W 7/8"	7/8	22,225	18,61	9	2,822
W 1"	1	25,400	21,34	8	3,175
W 1 1/8"	1 1/8	28,575	23,93	7	3,628
W 1 1/4"	1 1/4	31,750	27,11	7	3,628
W 1 3/8"	1 3/8	34,925	29,51	6	4,233
W 1 1/2"	1 1/2	38,100	32,68	6	4,233
W 1 5/8"	1 5/8	41,275	34,77	5	5,080
W 1 3/4"	1 3/4	44,450	37,95	5	5,080
W 1 7/8"	1 7/8	47,625	40,40	4,5	5,644
W 2"	2	50,800	43,58	4,5	5,644
W 2 1/4"	2 1/2	57,150	49,02	4	6,350
W 2 1/2"	2 1/2	63,500	55,37	4	6,350
W 2 3/4"	2 3/4	69,850	60,56	3,5	7,257
W 3 "	3	76,200	66,91	3,5	7,257
W 3 1/4"	3 1/4	82,550	72,55	3,25	7,815
W 3 1/2"	3 1/2	88,900	78,90	3,25	7,815
W 3 3/4"	3 3/4	95,250	84,41	3	8,467
W 4"	4	101,600	90,76	3	8,467

Whitworth Pipe Thread DIN ISO 228 BSP
(DIN 259)

British Standard Pipe Thread, with sealant compound
(parallel, cylindrical), external = G

Nominal Diameter	Major Diameter mm	Minor Diamter Nut mm	Tapping Drill Size mm	TPI	Pitch mm
G 1/8"	9,73	8,85	8,80	28	0,907
G 1/4"	13,16	11,89	11,80	19	1,337
G 3/8"	16,66	15,39	15,25	19	1,337
G 1/2"	20,95	19,17	19,00	14	1,814
G 5/8"	22,91	21,13	21,00	14	1,814
G 3/4"	26,44	24,66	24,50	14	1,814
G 7/8"	30,20	28,42	28,25	14	1,814
G 1"	33,25	30,93	30,75	11	2,309
G 1 1/8"	37,90	35,58	35,30	11	2,309
G 1 1/4"	41,91	39,59	39,25	11	2,309
G 1 3/8"	44,32	42,00	41,70	11	2,309
G 1 1/2"	47,80	45,48	45,25	11	2,309
G 1 3/4"	53,74	51,43	51,10	11	2,309
G 2"	59,61	57,29	57,00	11	2,309
G 2 1/4"	65,71	63,39	63,10	11	2,309
G 2 1/2"	75,18	72,86	72,60	11	2,309
G 2 3/4"	81,53	79,21	78,90	11	2,309
G 3"	87,88	85,56	85,30	11	2,309
G 3 1/4"	93,98	91,66	91,50	11	2,309
G 3 1/2"	100,33	98,01	97,70	11	2,309
G 3 3/4"	106,68	104,30	104,00	11	2,309
G 4"	113,03	110,71	110,40	11	2,309

Whitworth Tapered Pipe Thread

Whitworth Pipe Thread for pipes and fittings. Parallel female thread and tapered male thread (taper 1 : 16).
An appropriate sealing compound can be used in the thread to ensure a leak-proof joint.

Male Thread Diameter	Female Thread Diameter	Pipe Minor Diameter mm	Pipe Major Diameter mm	Tapping Drill Size mm	TPI	Pitch mm
R 1/16"	Rp 1/16"	3	7,723	6,561	28	0,907
R 1/8"	Rp 1/8"	6	9,728	8,566	28	0,907
R 1/4"	Rp 1/4"	8	13,157	11,445	19	1,337
R 3/8"	Rp 3/8"	10	16,662	14,950	19	1,337
R 1/2"	Rp 1/2"	15	20,995	18,631	14	1,814
R 3/4"	Rp 3/4"	20	26,441	24,117	14	1,814
R 1"	Rp 1"	25	33,249	30,291	11	2,309
R 1 1/4"	Rp 1 1/4"	32	41,910	38,952	11	2,309
R 1 1/2"	Rp 1 1/2"	40	47,803	44,845	11	2,309
R 2"	Rp 2"	50	59,614	56,656	11	2,309
R 2 1/2"	Rp 2 1/2"	65	75,184	72,226	11	2,309
R 3"	Rp 3"	80	87,884	84,926	11	2,309
R 4"	R 4"	100	113,030	110,072	11	2,309
R 5"	Rp 5"	125	138,430	135,472	11	2,309
R 6"	Rp 6"	150	163,830	160,872	11	2,309

Specifications of International Thread Standards

Thread Standards:

Lens mount Threads

Tripod Threads DIN 4503 / ISO 1222

ISO Metric Fine Thread DIN 13

ISO Metric Coarse Thread DIN 13

Pg Thread DIN 40430Steel Conduit Thread

Possibilites for a conversion:

Wrench Size for Cable Connection

Siemens & Halske Thread

Siemens & Halske Thread was used in telephones approx. 1900 AD.

E Thread DIN 40400Edison Thread

The name Edison thread for the socket of lamps traces back to Thomas Alva Edison.

Glass Thread DIN 40450 (Glasg)

Valves for Vehicle Tyres DIN 7756

Sewing Machine Thread (Nähnorm 100)

Bicycle Screw Thread DIN 79012

For cycles and motor-scooters

C.E.I.-Thread

Cycle Engineer Institution Thread, used in the British bicycle industry. Smetimes the name "BSC" or "BSCy" is used. This series replaced the Cycle Engineers Institute (CEI) thread. Though the two series are somewhat different.

Löwenherz Thread

Bodmer Thread

Bodmer Thread, formerly it was a thread for mechanical and optical instruments.

VDI Thread

Whitworth Fine Thread 1 DIN 239

Attention! Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.

Whitworth Fine Thread 2 DIN 240

Attention! Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.

Whitworth Fine Thread 12 TPI

Attention! Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI. Used in locomotive construction approx. until 1975.

Special Whitworth Fine Thread

Attention! Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI. Used in locomotive construction approx. until 1975.

Repair sizes for locomotive construction, DIN 30284.

Special thread for fire extinguishing fittings DIN LON 293

Whitworth Fine Thread 10 TPI

Attention! Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI. Used in locomotive construction approx. until 1975.

Whitworth Fine Thread 6 TPI

Attention! Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI. Used in locomotive construction approx. until 1975.

Knuckle Thread DIN 405

This thread is used by fire-brigades and fittings.

Knuckle Thread DIN 20400

This thread is used in the mining industry; with increased bearing depth.

Buttress Fine Thread DIN 514

Diameter

Buttress Coarse Thread DIN 513

Diameter

Trapezoidal Fine Thread DIN 103

Diameter

Trapezoidal Coarse Thread DIN 103

Diameter

NPT American Taper Pipe ThreadANSI B 1.20.1

American Taper Pipe Thread, with sealant compound.

NPTF American Taper Pipe ThreadANSI B 1.20.3

American Taper Pipe Thread for Dryseal joint without sealant compound.

UNC Thread ANSI B1.1

UNC - Unified Coarse Thread. The old definition NC is comparable with the metric thread. The new term UNC is comparable with the ISO metric thread. NC and UNC threads are interchangeable, in an analogous manner like the metric and the ISO metric thread.

UNEF Thread ANSI B1.1

UNEF - Unified Extra Fine Thread, which is used for special purposes.

UNF Thread ANSI B1.1

UNF - Unified National Fine Thread. Similar to UNC. UNC and UNF threads are the choices for the customary screws and nuts.

Unified Thread Series 8 TPI ANSI B1.1

8-UN - Unified Extra Fine Thread, which is used for special purposes.

Unified Thread Series 12 TPI ANSI B1.1

12-UN - Unified Extra Fine Thread, which is used for special purposes.

Unified Thread Series 16 TPI ANSI B1.1

16-UN - Unified Extra Fine Thread, which is used for special purposes.

American National ThreadANSI/ACME B1.5-1977

The ACME thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.

Stub ACME Thread ANSI/ASME B1.8-1977

The ACME thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.

Sharp "V" Thread

Used in the U.S.A. until 1909.

ME Model Engineer Thread

These come in 32 and 40 TPI sizes

British Association BS 93

British Association Standard Thread. Used for instruments and clocks. Replaced by the metric ISO thread and the ISO fine thread.

Whitworth Fine Thread BS 84

British Standard Fine Thread Series (parallel, cylindrical) BSW and BSF are the Thread selections for commercial screws and nuts. The Fine Thread, which is widespread in the Britisch machine tool industry, is superseded by the American UNF Thread.

Whitworth Coarse Thread BS 84 BSW (British Standard Whitworth)

British Standard Whitworth Coarse Thread Series (parallel, cylindrical) In GB most common Thread. Corresponds to the Metric Threadin its type of use.

Pg Thread DIN 40430
Steel Conduit Thread

E Thread DIN 40400
Edison Thread

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

Attention!
Please do not mistake this thread for the Whitworth Fine Thread BS 84. This thread is an old one which is not used anymore. The nominal diameter and the pitch are mentioned in millimeters or in TPI.
Used in locomotive construction approx. until 1975.

NPT American Taper Pipe Thread
ANSI B 1.20.1

NPTF American Taper Pipe Thread
ANSI B 1.20.3

American National Thread
ANSI/ACME B1.5-1977

British Standard Fine Thread Series (parallel, cylindrical)
BSW and BSF are the Thread selections for commercial screws and nuts. The Fine Thread, which is widespread in the Britisch machine tool industry, is superseded by the American UNF Thread.

Whitworth Coarse Thread BS 84
BSW (British Standard Whitworth)

British Standard Whitworth Coarse Thread Series (parallel, cylindrical)
In GB most common Thread. Corresponds to the Metric Thread
in its type of use.

Whitworth Pipe Thread DIN ISO 228 BSP
(DIN 259)

British Standard Pipe Thread, with sealant compound
(parallel, cylindrical), external = G

Whitworth Pipe Thread for pipes and fittings. Parallel female thread and tapered male thread (taper 1 : 16).
An appropriate sealing compound can be used in the thread to ensure a leak-proof joint.