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Thread standards
The following table shows the most commonly used thread standards. The corresponding external diameter and pitch are also given for each thread size.
M thread acc. to EN 60423, IEC 423 or BS 6053 ISO 68, DIN 13
Thread metric | PG thread acc. to DIN 40430
Thread PG | UNEF thread acc. to ANSI/ASME B 1.1
Thread UNEF | |||||||
|---|---|---|---|---|---|---|---|---|---|
M | O.D. | Pitch | PG | O.D. | Pitch | UNEF | O.D. | Pitch | |
| 8 | 8 | 1 | 7 | 12,5 | 1,27 | 1/2“ - 28 | 0,5000 | 12,700 | 0,9070 |
| 10 | 10 | 1 | 9 | 15,2 | 1,41 | 5/8“ - 24 | 0,6250 | 15,875 | 1,0580 |
| 12 | 12 | 1,5 | 44 | 18,6 | 1,41 | 3/4“ - 20 | 0,7500 | 19,050 | 1,2700 |
| 16 | 16 | 1,5 | 46,8 | 20,4 | 1,41 | 7/8“ - 20 | 0,8750 | 22,225 | 1,2700 |
| 20 | 20 | 1,5 | 16 | 22,5 | 1,41 | 15/16“ - 20 | 0,9375 | 23,813 | 1,2700 |
| 25 | 25 | 1,5 | 21 | 28,3 | 1,588 | 1“ - 20 | 1,0000 | 25,400 | 1,2700 |
| 32 | 32 | 1,5 | 29 | 37,0 | 1,588 | 13/16“ - 18 | 1,1875 | 30,163 | 1,4110 |
| 40 | 40 | 1,5 | 36 | 47,0 | 1,588 | 17/16 “- 18 | 1,4375 | 36,513 | 1,4110 |
| 50 | 50 | 1,5 | 42 | 54,0 | 1,588 | 13/4 “- 18 | 1,7500 | 44,450 | 1,7205 |
| 63 | 63 | 1,5 | 48 | 59,3 | 1,588 | 2“ - 18 | 2,0000 | 50,800 | 1,9706 |
NPT thread acc. to ANSI/ASME B 1.20.1
Thread NPT | G thread acc. To JIS B 0204, DIN ISO 2289-1 or BS 2779
Thread CTG | |||||
|---|---|---|---|---|---|---|
NPT | O.D. | Pitch | CTG | R | O.D. | Pitch |
1/4“ | 13,716 | 1,411 |
| 1/4“ | 13,16 | 1,340 |
3/8“ | 17,145 | 1,411 | G 16 | 1/2“ | 20,96 | 1,810 |
1/2“ | 21,336 | 1,814 | G 22 | 3/4“ | 26,44 | 1,810 |
3/4“ | 26,670 | 1,814 | G 28 | 1“ | 33,25 | 2,310 |
1“ | 33,401 | 2,208 | G 36 | 1 1/4“ | 41,91 | 2,208 |
1 1/4“ | 42,164 | 2,208 | G 42 | 1 1/2“ | 47,80 | 2,310 |
1 1/2“ | 48,260 | 2,208 | G 53 | 2“ | 59,61 | 2,310 |
2“ | 60,325 | 2,208 | ||||