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Thread Tables

Table of contents:

You can find basic information on measuring threads in our article: Threads in practice

Table of metric, pipe and inch threads - comparison

Threads are divided into external (a.k.a. male, screws) and internal (a.k.a. female, nuts). Male threads placed on the outside – shafts, and female threads – inside holes.

The following table provides comparative data for internal and external threads, both metric and inch.

Exterior diameter
(mm)		 Interior diameter
(mm)		 Coils per inch Pitch
(mm)		 BSPP, BSPT inch pipe Metric UBF (JIC, ORFS) Inch NPT, NPTF
7.8 - 8.0 6.8 - 7.0 1 M8x1
9.3 - 9.7 8.5 - 8.9 28 0.91 1/8"
9.3 - 9.7 8.5 - 8.9 27 0.95 1/8"
9.7 - 9.9 8.2 - 8.6 1.5 M10x1.5
9.7 - 9.9 8.7 - 9.1 1 M10x1
10.9 - 11.1 9.7 - 10.0 20 1.27 7/16" - 20
11.6 - 11.9 10.2 - 10.6 1.5 M12x1.5
12.4 - 12.7 11.3 - 11.6 20 1.27 1/2" - 20
12.9 - 13.1 11.4 - 11.9 19 1.34 1/4"
12.9 - 13.1 11.4 - 11.9 18 1.41 1/4"
13.6 - 13.9 12.2 - 12.6 1.5 M14x1.5
14.0 - 14.3 12.7 - 13.0 18 1.41 9/16" - 18
15.6 - 15.9 14.2 - 14.6 1.5 M16x1.5
16.3 - 16.6 14.9 - 15.4 19 1.34 3/8"
16.3 - 16.6 14.9 - 15.4 18 1.41 3/8"
17.1 - 17.4 15.8 - 16.1 16 1.59 11/16" - 16
17.6 - 17.9 16.2 - 16.6 1.5 M18x1.5
18.7 - 19.0 17.3 - 17.6 16 1.59 3/4" - 16
19.6 - 19.9 18.2 - 18.6 1.5 M20x1.5
20.3 - 20.6 18.9 - 19.3 16 1.59 13/16" - 16
20.5 - 20.9 18.6 - 19.0 14 1.81 1/2"
20.7 - 21.1 18.3 - 18.7 14 1.81 1/2"
21.6 - 21.9 20.2 - 20.6 1.5 M22x1.5
22.0 - 22.2 20.2 - 20.5 14 1.81 7/8" - 14
22.6 - 22.9 20.6 - 21.0 14 1.81 5/8"
23.6 - 23.9 22.2 - 22.6 1.5 M24x1.5
25.1 - 25.4 23.4 - 23.8 14 1.81 1" - 14
25.6 - 25.9 24.2 - 24.6 1.5 M26x1.5
26.1 - 26.4 24.1 - 24.5 14 1.81 3/4"
26.3 - 26.7 23.7 - 24.1 14 1.81 3/4"
26.6 - 26.9 24.3 - 24.7 12 2.12 1-1/16" - 12
26.6 - 26.9 24.6 - 25.0 2 M27x2
26.6 - 26.9 25.2 - 25.6 1.5 M27x1.5
27.6 - 27.9 26.2 - 26.6 1.5 M28x1.5
29.6 - 29.9 27.4 - 27.8 2 M30x2
29.6 - 29.9 28.2 - 28.6 1.5 M30x1.5
29.8 - 30.1 27.6 - 27.9 12 2.12 1-3/16" - 12
29.8 - 30.2 27.8 - 28.1 14 1.81 7/8"
32.6 - 32.9 30.5 - 30.9 2 M33x2
32.6 - 32.9 31.2 - 31.6 1.5 M33x1.5
33.0 - 33.2 30.3 - 30.8 11 2.31 1"
33.0 - 33.3 30.8 - 31.2 12 2.12 1-5/16" - 12
32.9 - 33.4 30.3 - 30.8 11.5 2.21 1"
35.6 - 35.9 33.4 - 33.8 2 M36x2
36.2 - 36.5 34.3 - 34.7 12 2.12 1-7/16" - 12
37.6 - 37.9 34.8 - 35.1 11 2.31 1-1/8"
37.6 - 37.9 36.2 - 36.6 1.5 M38x1.5
40.9 - 41.2 38.7 - 39.1 12 2.12 1 - 5/8 " - 12
41.6 - 41.9 39.4 - 39.8 2 M42x2
41.5 - 41.9 39.0 - 39.5 11 2.31 1.0-1/4"
41.4 - 42.0 39.2 - 39.6 11.5 2.21 1-1/4"
42.5 - 42.8 40.6 - 41.0 12 2.12 1-11/16" - 12
44.6 - 44.9 42.4 - 42.8 2 M45x2
44.6 - 44.9 43.2 - 43.6 1.5 M45x1.5
47.3 - 47.6 45.1 - 45.5 12 2.12 1-7/8" - 12
47.4 - 47.8 44.8 - 45.3 11 2.31 1-1/2"
47.3 - 47.9 45.1 - 45.5 11.5 2.21 1-1/2"
50.5 - 50.8 48.6 - 49.0 12 2.12 2" - 12
51.6 - 51.9 49.4 - 49.6 2 M52x2
51.6 - 51.9 50.2 - 50.6 1.5 M52x1.5
59.4 - 59.8 56.5 - 56.8 11 2.31 2"
59.9 - 60.2 56.4 - 56.7 11.5 2.21 2"
Exterior diameter
(mm)		 Interior diameter
(mm)		 Coils per inch Pitch
(mm)		 BSPP, BSPT inch pipe Metric UBF (JIC, ORFS) Inch NPT, NPTF

Downloadable: Table of metric, pipe and inch threads.pdf

Table of G (BSP) cylindrical pipe threads

“British Standard Pipe” is the name of the British standard for inch cylindrical threads with a triangular outline and an angle of 55°. They are used in connections requiring thread tightness.

The following table shows the parameters of cylindrical pipe threads according to the G/BSP standard.

UNC/UNF thread
(inches)		 Pitch 1"/P
(mm)		 P
(mm)		 Bore Ø min.
(mm)		 Bore Ø max.
(mm)		 Shaft Ø min.
(mm)		 Shaft Ø max.
(mm)
1/16 28 0.907 6.56 6.84 7.51 7.72
1/8 28 0.907 8.57 8.85 9.51 9.73
1/4 19 1.337 11.45 11.89 12.91 13.16
3/8 19 1.337 14.95 15.39 16.41 16.66
1/2 14 1.814 18.63 19.17 20.67 20.95
5/8 14 1.814 20.59 21.13 22.63 22.91
3/4 14 1.814 12.12 24.66 26.16 26.44
7/8 14 1.814 27.88 28.42 29.92 30.20
1 11 2.309 30.29 30.93 32.89 33.25
1 & 1/8 11 2.309 34.94 35.58 37.54 37.90
1 & 1/4 11 2.309 38.95 39.59 41.55 41.91
1 & 1/2 11 2.309 44.84 45.48 47.44 47.80
1 & 3/4 11 2.309 50.79 51.43 53.39 53.75
2 11 2.309 56.66 57.30 59.25 59.61
2 & 1/4 11 2.309 62.75 63.39 65.28 65.71
2 & 1/2 11 2.309 72.23 72.87 74.75 75.18
2 & 3/4 11 2.309 78.58 79.22 81.10 81.53
3 11 2.309 84.93 85.57 87.45 87.88
3 & 1/2 11 2.309 97.37 98.01 99.90 100.33
4 11 2.309 110.07 110.71 112.60 113.03
4 & 1/2 11 2.309 122.77 123.41 125.30 125.73
5 11 2.309 135.47 136.11 138.00 138.43
5 & 1/2 11 2.309 148.17 148.81 150.70 151.13
6 11 2.309 160.87 161.51 163.40 163.83
UNC/UNF thread
(inches)		 Pitch 1"/P
(mm)		 P
(mm)		 Bore Ø min.
(mm)		 Bore Ø max.
(mm)		 Shaft Ø min.
(mm)		 Shaft Ø max.
(mm)

Downloadable: Table of G (BSP) cylindrical pipe threads.pdf

Table of BSPT tapered pipe threads

“British Standard Taper Pipe Thread” is the name of the standard for British tapered pipe threads with a profile angle of 55°. Although these threads are self-sealing, they can be used with a gasket.

The following table contains data for pipe threads according to the BSPT standard.

Installation suppleme
Thread pipe size in
inches 		measuring length T2/2)
- 		7.723
1/16 		9.728
1/8 		13.157
1/4 		16.662
3/8 		20.955
1/2 		26.441
3/4 		33.249
1 		38.952
1 & 1/4 		44.845
1 & 1/2 		56.656
2 		75.184
2 & 1/2 		87.884
3 		110.072
4 		138.43
5 		160.872
6 		mm
---
Coils per inch
(25.4 mm)		 N 28 28 19 19 14 14 11 11 11 11 11 11 11 11 11
Thread pitch P 0.907 0.907 1.337 1.337 1.814 1.814 2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309 mm
Thread height H 0.581 0.581 0.856 0.856 1.162 1.162 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479
Diameters in
the gauge plane		 Major
(gauge diameter)		 D 7.723 9.728 13.157 16.662 20.955 26.441 33.249 41.91 47.803 59.614 75.184 87.884 113.03 138.43 163.83
Level d2 7.142 9.147 13.301 15.806 19.793 25.279 31.77 40.431 46.324 58.135 73.705 86.405 111.551 136.95 162.351
Fine d1 6.561 8.566 11.445 14.95 18.631 24.117 30.291 38.952 44.845 56.656 72.226 84.926 110.072 135.47 160.872
Measuring length
(male thread)		 Nominal --- 4 4 6 6.4 8.2 9.5 10.4 12.7 12.7 15.9 17.5 20.6 25.4 28.6 28.6
Tolerance
(mm)		 (+/- T1/2) 0.9 0.9 1.3 1.3 1.8 1.8 2.3 2.3 2.3 2.3 3.5 3.5 3.5 3.5 3.5
Thread's coil tolerance 1 1 1 1 1 1 1 1 1 1 1.5 1.5 1.5 1.5 1.5 ---
Max --- 4.9 4.9 7.3 7.7 10 11.3 12.7 15 15 18.2 21 24.1 28.9 32.1 32.1 mm
Min --- 3.1 3.1 4.7 5.1 6.4 7.7 8.1 10.4 10.4 13.6 14 17.1 21.9 25.1 25.1
Internal thread check plane position tolerance Tolerance (mm) (+/- T2/2) 1.1 1.1 1.7 1.7 2.3 2.3 2.9 2.9 2.9 2.9 3.5 3.5 3.5 3.5 3.5
Thread's coil tolerance 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.5 1.5 1.5 1.5 1.5 ---
Usable male thread's length no lesser than For nominal measuring length --- 6.5 6.5 9.7 10.1 13.2 14.5 16.8 19.1 19.1 23.4 26.7 29.8 35.8 40.1 40.1 mm
For maximum measuring length 7.4 7.4 11 11.4 15 16.3 19.1 21.4 21.4 25.7 30.2 33.3 39.3 43.6 43.6
For minimum measuring length 5.6 5.6 8.4 8.8 11.4 12.7 14.5 16.8 16.8 21.1 23.2 26.3 32.3 36.6 36.6
Installation supplement (mm) --- 2.5 2.5 3.7 3.7 5 5 6.4 6.4 6.4 7.5 9.2 9.2 10.4 11.5 11.5
thread coils 2.75 2.75 2.75 2.75 2.75 2.75 2.75 2.75 2.75 3.25 4 4 4.5 5 5 ---
Parallel internal threads' diameter tolerance --- --- +/- 0.071 +/- 0.071 +/- 0.071 +/- 0.104 +/- 0.142 +/- 0.142 +/- 0.18 +/- 0.18 +/- 0.18 +/- 0.18 +/- 0.216 +/- 0.216 +/- 0.216 +/- 0.216 +/- 0.216 mm
Thread pipe size in
inches 		- 1/16 1/8 1/4 3/8 1/2 3/4 1 1 & 1/4 1 & 1/2 2 2 & 1/2 3 4 5 6 ---

Downloadable: Table of BSPT tapered pipe threads.pdf