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Thread standards / thread types
The table below provides a convenient overview of the most common thread standards and thread types. Along with each thread size, you'll find the corresponding outside diameter and thread pitch, making it easier to identify compatible connections and components.
M thread acc. to EN 60423, IEC 423 or BS 6053 ISO 68, DIN 13
Metric thread | PG thread acc. to DIN 40430
PG thread | UNEF thread acc. to ANSI/ASME B 1.1
UNEF thread | |||||||
|---|---|---|---|---|---|---|---|---|---|
M | Outer Ø | Pitch | PG | Outer Ø | Pitch | UNEF | Outer Ø | 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
NPT thread | G thread acc. To JIS B 0204, DIN ISO 2289-1 or BS 2779
CTG thread | |||||
|---|---|---|---|---|---|---|
NPT | Outer Ø | Pitch | CTG | R | Outer Ø | 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 | ||||