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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Low-Pressure Iron and Steel
Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Some meet DIN 431, which is an international standard for pipe fitting locknut dimensions.
NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
Locknuts
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class:
NPT: 125
NPSL: 150 - Specifications Met:
NPT: ASME B1.20.1, ASME B16.4
NPSL: ASME B16.14
BSPP: DIN 431 - Pipe Nipples and Pipe:
NPT, NPSL: Use Schedule 40 steel
Pipe Size | Material | Each | |
NPSL Female | |||
|---|---|---|---|
| 1/8 | Steel | 000000000 | 00000 |
| 1/4 | Steel | 000000000 | 0000 |
| 3/8 | Iron | 000000000 | 0000 |
| 1/2 | Iron | 000000000 | 0000 |
| 3/4 | Iron | 000000000 | 0000 |
| 1 | Iron | 000000000 | 0000 |
| 1 1/4 | Iron | 000000000 | 0000 |
| 1 1/2 | Iron | 000000000 | 00000 |
| 2 | Iron | 000000000 | 00000 |
BSPP Female | |||
| 1/8 | Steel | 0000000 | 0000 |
| 1/4 | Steel | 0000000 | 0000 |
| 3/8 | Steel | 0000000 | 0000 |
| 1/2 | Steel | 0000000 | 0000 |
| 3/4 | Steel | 0000000 | 0000 |
| 1 | Steel | 0000000 | 00000 |
| 1 1/4 | Steel | 0000000 | 00000 |
| 1 1/2 | Steel | 0000000 | 00000 |
| 2 | Steel | 0000000 | 00000 |