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Conduit Fittings Thread Data
| NPT American taper pipe thread conforming to ANSI/ASME B1.20.1 – 1983 |
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| Thread size (inches) |
External thread outside diameter (mm) |
Pitch (mm) |
| 3/8 | 16.7 | 1.14 |
| 1/2 | 21.0 | 1.81 |
| 3/4 | 26.4 | 1.81 |
| 1 | 33.3 | 2.21 |
| 1-1/4 | 41.9 | 2.21 |
| 1-1/2 | 47.8 | 2.21 |
| 2 | 59.6 | 2.21 |
| PG German standard thread conforming to DIN40430 |
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| Thread size |
External thread outside diameter (mm) |
Internal thread inside diameter (mm) |
Pitch (mm) |
| PG 7 | 12.5 | 11.3 | 1.27 |
| PG 9 | 15.2 | 13.9 | 1.41 |
| PG 11 | 18.6 | 17.3 | 1.41 |
| PG 13.5 | 20.4 | 19.1 | 1.41 |
| PG 16 | 22.5 | 21.2 | 1.41 |
| PG 21 | 28.3 | 26.8 | 1.59 |
| PG 29 | 37.0 | 35.5 | 1.59 |
| PG 36 | 47.0 | 45.5 | 1.59 |
| PG 42 | 54.0 | 52.5 | 1.59 |
| PG 48 | 59.3 | 57.8 | 1.59 |
| Metric standard thread conforming to EN60423 | |||
| Thread size |
External thread outside diameter (mm) |
Internal thread inside diameter (mm) |
Pitch (mm) |
| M12 | 12.0 | 10.4 | 1.5 |
| M16 | 16.0 | 14.4 | 1.5 |
| M20 | 20.0 | 18.4 | 1.5 |
| M25 | 25.0 | 23.4 | 1.5 |
| M32 | 32.0 | 30.4 | 1.5 |
| M40 | 40.0 | 38.4 | 1.5 |
| M50 | 50.0 | 48.4 | 1.5 |
| M63 | 63.0 | 61.4 | 1.5 |
| M75 | 75.0 | 73.4 | 1.5 |