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Maximum Pressure Maximum Pressure |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Thread Size Thread Size |
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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 Conduit
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Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPTF (Dryseal) 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.

- For Use With: Air, Oil, Water
- Pressure Class: 150
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- Flanges: Use Class 125 aluminum
Pipe Size | Max. Pressure | Each | |
NPSL Female | |||
---|---|---|---|
1/4 | 150 psi @ 72° F | 000000000 | 00000 |
3/8 | 150 psi @ 72° F | 000000000 | 0000 |
1/2 | 150 psi @ 72° F | 000000000 | 0000 |
3/4 | 150 psi @ 72° F | 000000000 | 0000 |
1 | 150 psi @ 72° F | 000000000 | 00000 |
1 1/4 | 150 psi @ 72° F | 000000000 | 00000 |
1 1/2 | 150 psi @ 72° F | 000000000 | 00000 |
2 | 150 psi @ 72° F | 000000000 | 00000 |
2 1/2 | 150 psi @ 72° F | 000000000 | 00000 |
3 | 150 psi @ 72° F | 000000000 | 00000 |
Nuts for 37° Flared Fittings for Aluminum Tubing

- For Use With: Air, Coolant, Gasoline, Hydraulic Fluid, Water
- Temperature Range: -60° to 350° F
- Tubing: Use with seamless aluminum
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on aluminum tubing that is flared to 37°. Nuts are aluminum, which is lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
For Tube OD | Nut Material | Max. Pressure | Each | |
3/16" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 00000 |
1/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
5/16" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
3/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1/2" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
5/8" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
3/4" | Anodized 2024 Aluminum | 3,000 psi @ 72° F | 0000000 | 0000 |
1" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 0000 |
1 1/4" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 00000 |
Locknuts for Metal Conduit Fittings

316 Stainless
Steel, and Aluminum
Secure threaded metal conduit fittings to a knockout in an outlet box or enclosure.
Zinc-plated steel, 316 stainless steel, and aluminum locknuts are compatible with NPSL and NPSM threads.
For technical drawings and 3-D models, click on a part number.