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Threads

Metric threads

Metrisches Gewinde
Thread Diameter Pitch Core hole nut Outer-Bolt-Ø Bolt-Flanks-Ø Bolt-Core-Ø
M mm mm max. min. max. min. max.
3 0,5 2,5 2,980 2,874 2,655 2,580 2,367
3,5 0,6 2,9 3,479 3,354 3,089 3,004 2,743
4 0,7 3,3 3,978 3,838 3,523 3,433 3,119
4,5 0,75 3,7 4,478 4,338 3,991 3,901 3,558
5 0,8 4,2 4,976 4,826 4,456 4,361 3,995
6 1 5 5,974 5,794 5,234 5,212 4,747
7 1 6 6,972 6,794 6,324 6,212 5,747
8 1,25 6,8 7,972 7,760 7,160 7,042 6,438
9 1,25 7,8 8,972 8,760 8,160 8,042 7,438
10 1,5 8,5 9,968 9,732 8,994 8,862 8,128
11 1,5 9,5 10,986 10,732 9,994 9,862 9,128
12 1,75 10,2 11,966 11,701 10,829 10,679 9,819
14 2 12 13,962 12,682 12,663 12,503 11,508
16 2 14 15,962 15,682 14,663 14,503 13,508
18 2,5 15,5 17,958 17,623 16,334 16,164 14,891
20 2,5 17,5 19,958 19,623 18,334 18,164 16,891
22 2,5 19,5 21,958 21,623 20,334 20,164 18,891
24 3 21 23,952 23,577 22,003 21,803 20,271
27 3 24 26,952 26,577 25,003 24,803 23,271
30 3,5 26,5 29,947 29,522 27,674 27,462 25,653
33 3,5 29,5 32,947 32,522 30,674 30,462 28,653
36 4 32 35,940 35,465 33,342 33,118 31,033
39 4 35 38,940 38,465 36,342 36,118 34,033
42 4,5 37,5 41,937 41,437 39,014 38,778 36,416
45 4,5 40,5 44,937 44,437 42,014 41,778 39,416
48 5 43 47,929 47,399 44,681 44,431 41,795
52 5 47 51,929 51,399 48,681 48,431 45,795
56 5,5 50,5 55,925 55,365 52,353 52,088 49,177
60 5,5 54,5 59,925 59,365 56,353 56,088 53,177
64 6 58 63,920 63,320 60,023 59,743 56,559
68 6 62 67,920 67,320 64,023 64,743 60,559

Sources:
DIN 13-1 - ISO metric threads for general use - Part 1: Nominal sizes for standard threads; nominal thread diameters from 1 mm to 68 mm
DIN 13-2 - ISO metric threads for general use - Part 2: Nominal dimensions for fine pitch threads with pitches of 0.2 mm, 0.25 mm and 0.35 mm; nominal thread diameters from 1 mm to 50 mm

UNC-Threads

UNC-Gewinde
Thread Diameter Outer Diameter Core Hole Diameter Threads Pitch
UNC inch mm mm per inch mm
N 1 0,073 1,854 1,50 64 0,397
N 2 0,086 2,184 1,80 56 0,456
N 3 0,99 2,515 2,10 48 0,529
N 4 0,112 2,845 2,35 40 0,635
N 5 0,250 3,175 2,65 40 0,635
N 6 0,138 3,505 2,85 32 0,794
N 8 0,164 4,166 3,50 32 0,794
N 10 0,190 4,826 4,00 24 1,058
N 12 0,216 5,486 4,65 24 1,058
1/4" 0,250 6,350 5,35 20 1,270
5/16" 0,313 7,938 6,80 18 1,411
3/8" 0,375 9,525 8,25 16 1,587
7/16" 0,438 11,112 9,65 14 1,818
1/2" 0,500 12,700 11,15 13 1,954
9/16" 0,563 14,288 12,60 12 2,117
5/8" 0,625 15,875 14,05 11 2,309
3/4" 0,750 19,050 17,00 10 2,540
7/8" 0,875 22,225 20,00 9 2,822
1" 1,000 25,400 22,85 8 3,175
1 1/8" 1,125 28,575 25,65 7 3,628
1 1/4" 1,250 31,750 28,85 7 3,628
1 3/8" 1,375 43,925 31,55 6 4,233
1 1/2" 1,500 38,100 34,70 6 4,233
1 3/4" 1,750 44,450 40,40 5 5,080
2" 2,000 50,800 46,30 4,5 5,644
2 1/4" 2,250 57,150 52,65 45 5,644
2 1/2" 2,500 63,500 58,50 4 6,350
2 3/4" 2,750 69,850 64,75 4 6,350
3" 3,000 76,200 71,10 4 6,350
3 1/4" 3,250 82,550 77,45 4 6,350
3 1/2" 3,500 88,900 83,80 4 6,350
3 3/4" 3,750 95,250 90,15 4 6,350
4" 4,000 101,60 96,50 4 6,350
Typically, thread dimensions >= 1" are offered by the manufacturers with an 8-UN thread.

UNF-Threads

Thread Diameter Outer Diameter Core Hole Diameter Threads Pitch
UNF inch mm mm per inch mm
N 0 0,060 1,524 1,25 80 0,317
N 1 0,073 1,854 1,55 72 0,353
N 2 0,068 2,184 1,90 64 0,397
N 3 0,099 2,515 2,15 56 0,453
N 4 0,112 2,845 2,40 48 0,529
N 5 0,125 3,175 2,70 44 0,577
N 6 0,138 3,505 2,95 40 0,635
N 8 0,164 4,166 3,50 36 0,705
N 10 0,190 4,826 4,10 32 0,794
N 12 0,216 5,486 4,70 28 0,907
1/4" 0,250 6,350 5,50 28 0,907
5/16" 0,313 7,938 6,90 24 1,058
3/8" 0,375 9,525 8,50 24 1,058
7/16" 0,438 11,112 9,90 20 1,270
1/2" 0,500 12,700 11,50 20 1,270
9/16" 0,563 14,288 12,90 18 1,411
5/8" 0,625 15,875 14,50 18 1,411
3/4" 0,750 19,050 17,50 16 1,587
7/8" 0,875 22,250 20,40 14 1,814
1" 1,000 25,400 23,25 12 2,117
1 1/8" 1,125 28,575 26,50 12 2,117
1 1/4" 1,250 31,750 29,50 12 2,117
1 3/8" 1,375 38,100 32,75 12 2,117
1 1/2" 1,500 43,925 36,00 12 2,117
Typically, thread dimensions ≥ 1" with an 8-UN thread are offered by manufacturers.

Source:
ASME B1.1 - Unified Inch Screw Threads

8-UN-Threads

UN-Gewinde
Thread identification Diameter Outer Diameter Core Hole Diameter Threads Pitch
inch mm mm per inch mm mm
1 1/16" - 8UN 1,0625 26,987 24,000 8 3,175
1 1/8" - 8UN 1,1250 28,575 25,500 8 3,175
1 3/16" - 8UN 1,1875 30,162 27,200 8 3,175
1 1/4" - 8UN 1,2500 31,750 28,800 8 3,175
1 5/16" - 8UN 1,3125 33,337 30,300 8 3,175
1 3/8" - 8UN 1,3750 34,925 31,900 8 3,175
1 7/16" - 8UN 1,4375 36,512 33,500 8 3,175
1 1/2" - 8UN 1,5000 38,100 35,100 8 3,175
1 9/16"- 8UN 1,5625 39,688 36,700 8 3,175
1 5/8"- 8UN 1,6250 41,275 38,300 8 3,175
1 11/16"- 8UN 1,6875 42,862 39,900 8 3,175
1 3/4"- 8UN 1,7500 44,450 41,400 8 3,175
1 13/16"- 8UN 1,8125 46,037 43,000 8 3,175
1 7/8"- 8UN 1,8750 47,625 44,600 8 3,175
1 15/16"- 8UN 1,9375 49,212 46,200 8 3,175
2"- 8UN 2,0000 50,800 47,800 8 3,175
2 1/8"- 8UN 2,1250 53,975 51,000 8 3,175
2 1/4"- 8UN 2,2500 57,150 54,100 8 3,175
2 3/8"- 8UN 2,3750 60,325 57,300 8 3,175
2 1/2"- 8UN 2,5000 63,500 60,500 8 3,175
2 5/8"- 8UN 2,6250 66,675 64,700 8 3,175
2 3/4"- 8UN 2,7500 69,850 66,800 8 3,175
2 7/8"- 8UN 2,8750 73,025 70,000 8 3,175
3"- 8UN 3,0000 76,200 73,200 8 3,175
3 1/8"- 8UN 3,1250 79,375 76,400 8 3,175
3 1/4"- 8UN 3,2500 82,550 79,500 8 3,175
3 3/8"- 8UN 3,3750 85,725 82,700 8 3,175
3 1/2"- 8UN 3,5000 88,900 85,900 8 3,175
3 5/8"- 8UN 3,6250 92,075 89,000 8 3,175
3 3/4"- 8UN 3,7500 95,250 92,300 8 3,175
3 7/8"- 8UN 3,8750 98,425 95,400 8 3,175
4"- 8UN 4,0000 101,600 98,600 8 3,175

Source:
ASME B1.1 - Unified Screw Threads

NPT-Pipe threads

NPT-Rohrgewinde
Thread Diameter Pitch Threads Core Hole Diameter Outer Diameter
NPT mm per inch mm mm
1/16" 0,941 27 6,00 7,895
1/8" 0,941 27 8,25 10,242
1/4" 1,411 18 10,70 13,616
3/8" 1,411 18 14,10 17,055
1/2" 1,814 14 17,40 21,223
3/4" 1,814 14 22,60 26,568
1" 2,209 11,5 28,50 33,228
1 1/4" 2,209 11,5 37,00 41,985
1 1/2" 2,209 11,5 43,50 48,054
2" 2,209 11,5 55,00 60,092
2 1/2" 3,175 8 65,50 72,699
3" 3,175 8 81,50 88,608
3 1/2" 3,175 8 94,30 101,316
4" 3,175 8 107,00 113,973
5" 3,175 8 134,384 141,300
6" 3,175 8 161,191 168,275
8" 3,175 8 211,673 219,075
10" 1,375 8 265,311 273,050
12" 1,375 8 315,793 323,850
1" (inch) = 25,4 mm

Source:
ANSI / ASME B 1.20.1 - Universal pipe thread (inch)

Whitworth pipe thread - G

Whitworth Rohrgewinde - G

Rohrgewinde für nicht im Gewinde dichtende Verbindungen (zylindrisch), außen = G

Thread Diameter Pitch Threads Nut Diameter Core Hole Diameter
G mm per inch mm max.
1/8" 0,907 28 8,85 8,80
1/4" 1,337 19 11,89 11,80
3/8" 1,337 19 15,39 15,25
1/2" 1,814 14 19,17 19,00
5/8" 1,814 14 21,13 21,00
3/4" 1,814 14 24,66 24,50
7/8" 1,814 14 28,42 28,25
1" 2,309 11 30,93 30,75
1 1/8" 2,309 11 35,58 35,30
1 1/4" 2,309 11 39,59 39,25
1 3/8" 2,309 11 42 41,70
1 1/2" 2,309 11 45,48 45,25
1 3/4" 2,309 11 51,43 51,10
2" 2,309 11 57,29 57,00
2 1/4" 2,309 11 63,39 63,10
2 1/2" 2,309 11 72,86 72,60
2 3/4" 2,309 11 79,21 78,90
3" 2,309 11 85,56 85,30
3 1/4" 2,309 11 91,66 91,50
3 1/2" 2,309 11 98,01 97,70
3 3/4" 2,309 11 104,30 104,00
4" 2,309 11 110,71 110,40
1" (inch) ) 25,4 mm

Whitworth pipe thread - R

Kegeliges Whitworth Rohrgewinde

Whitworth taper pipe thread.
Whitworth pipe thread for threaded pipes and fittings. Cylindrical female thread and tapered (taper 1 :16) male thread. A suitable sealant may be used in the thread to ensure a tight connection.

Outer Thread Inner Thread Nominal Size Pipe Pitch Threads Outer Diameter Core Hole Diameter
R Rp mm mm per inch mm mm
1/16" 1/16" 3 0,907 28 7,723 6,561
1/8" 1/8" 6 0,907 28 9,728 8,566
1/4" 1/4" 8 1,337 19 13,157 11,445
3/8" 3/8" 10 1,337 19 16,662 14,950
1/2" 1/2" 15 1,814 14 20,995 18,631
3/4" 3/4" 20 1,817 14 26,441 24,117
1" 1" 25 2,309 11 33,249 30,291
1 1/4" 1 1/4" 32 2,309 11 41,910 38,952
1 1/2" 1 1/2" 40 2,309 11 47,803 44,845
2" 2" 50 2,309 11 59,614 56,656
2 1/2" 2 1/2" 65 2,309 11 75,184 72,226
3" 3" 80 2,309 11 87,884 84,926
4" 4" 100 2,309 11 113,03 110,072
5" 5" 125 2,309 11 138,43 135,472
6" 6" 150 2,309 11 163,83 160,872
1" (inch) = 25,4 mm

Sources:
DIN EN ISO 228-1 - Pipe threads for non-threaded connections - Part 1: Dimensions, tolerances and designation
DIN 2999-1 - Whitworth pipe threads for threaded pipes and fittings; cylindrical internal thread and tapered external thread; thread dimensions

Round threads

Rundgewinde
Thread Outer Diameter Bolt Diameter Core Hole Diameter Pitch Threads
Rd Rp mm mm mm per inch
8 8,254 5,46 5,714 2,54 10
9 9,254 6,46 6,714 2,54 10
10 10,254 7,46 7,714 2,54 10
11 11,254 8,46 8,714 2,54 10
12 12,254 9,46 9,714 2,54 10
14 14,318 10,825 11,142 3,175 8
16 16,318 14,166 12,825 3,175 8
18 18,318 14,825 14,142 3,175 8
20 20,318 16,825 17,142 3,175 8
22 22,318 18,825 19,142 3,175 8
24 24,318 20,825 21,142 3,175 8
28 28,318 24,825 25,142 3,175 8
30 30,318 26,825 27,142 3,175 8
32 32,818 28,825 29,142 3,175 8
34 34,318 30,825 31,142 3,175 8
36 36,318 32,825 33,142 3,175 8
38 38,318 34,825 35,142 3,175 8
40 40,423 35,767 36,190 4,233 6
42 42,423 37,767 38,190 4,233 6
44 44,423 39,767 40,190 4,233 6
46 46,423 41,767 42,190 4,233 6
48 48,423 43,767 44,190 4,233 6
50 50,423 45,767 46,190 4,233 6
1" (inch) = 25,4 mm

Source:
DIN 405-1 - Round thread for general use - Part 1: Thread profiles, nominal dimensions