DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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For Use With For Use With |
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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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About Nuts, Materials, and Finishes
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Brass Nylon-Insert Locknuts

These locknuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Insert Max. Temp., °F | Pkg. Qty. | Pkg. | |
Brass | ||||||
---|---|---|---|---|---|---|
4-40 | 1/4" | 9/64" | 220° | 50 | 000000000 | 00000 |
6-32 | 5/16" | 11/64" | 220° | 25 | 000000000 | 0000 |
8-32 | 11/32" | 15/64" | 220° | 25 | 000000000 | 0000 |
10-24 | 3/8" | 15/64" | 220° | 25 | 000000000 | 0000 |
10-32 | 3/8" | 15/64" | 220° | 25 | 000000000 | 0000 |
1/4"-20 | 7/16" | 5/16" | 220° | 10 | 000000000 | 0000 |
5/16"-18 | 1/2" | 11/32" | 220° | 10 | 000000000 | 00000 |
3/8"-16 | 9/16" | 29/64" | 220° | 5 | 000000000 | 0000 |
1/2"-13 | 3/4" | 19/32" | 220° | 1 | 000000000 | 0000 |
5/8"-11 | 15/16" | 3/4" | 220° | 1 | 000000000 | 00000 |
3/4"-10 | 1 1/16" | 7/8" | 220° | 1 | 000000000 | 00000 |
Low-Pressure Brass and Bronze Threaded Pipe Fittings
Use these fittings in low-pressure flow applications. They have good corrosion resistance.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Locknuts that meet DIN 431 adhere to international standards for locknut dimensions.
For technical drawings and 3-D models, click on a part number.

- For Use With: See table
- Pressure Class: See table
- Specifications Met: See table
- Pipe Nipples and Pipe: See table
- Flanges: See table
For Pipe | For Flange | |||||||
---|---|---|---|---|---|---|---|---|
Pipe Size | Max. Pressure | Material | Material | Material | For Use With | Specifications Met | Each | |
BSPP Female | ||||||||
1/8 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |
1/4 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
3/8 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
1/2 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
3/4 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 0000 |
1 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |
1 1/4 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |
1 1/2 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 00000 |