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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.


Thread

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 Fine Thread

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
ISO Coarse Thread

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
Pg Thread


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
Edison Thread

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
 
Glass Thread

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
Valve Thread

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
Sewing Machine Thread

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
Cycle Thread

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
CEI Thread

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
Löwenherz Thread

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
Bodmer Thread

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
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.
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 DIN 239

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 DIN 240

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
Whitworth Fine Thread DIN 239

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
Whitworth Fine Thread DIN 30284

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 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.
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 DIN 239

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
Whitworth Fine Thread DIN 239

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 405

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
Knuckle Thread DIN 20400

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 Fine Thread

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
 
/Buttress Coarse Thread

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 Fine Thread

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
 
Trapezoidal Coarse Thread

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
NPT

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
NPTF

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
UNC Thread

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
UNEF Thread

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
UNF Thread

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
8-UN Thread

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
12-UN Thread

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
16-UN Thread

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
Sharp V Thread

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
ME Thread

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
BA-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.
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 Fine 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.
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 Coarse Thread

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 Pipe Thread

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
Tapered Whitworth Pipe Thread


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