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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.
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 | |
NPT Female | |||
|---|---|---|---|
| 3 | Iron | 000000000 | 000000 |