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About Conduit
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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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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.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Class:
NPSL: 150 - Specifications Met:
NPSL: ASME B16.14
BSPP: DIN 431 - Pipe Nipples and Pipe:
NPSL: Use Schedule 40 steel
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
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.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Class: 150
- Specifications Met: ASME B16.14
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
| Pipe Size | Material | Each | |
NPSL Female | |||
|---|---|---|---|
| 1/4 | Galvanized Steel | 00000000 | 00000 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications.
Galvanized and zinc-plated steel fittings have better corrosion resistance than plain steel fittings. PTFE-coated steel fittings have better corrosion resistance than galvanized and zinc-plated steel fittings.
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.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range: -100° to 500° F
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 02 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1/4 | 04 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 3/8 | 06 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1/2 | 08 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 3/4 | 12 | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1 | 16 | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1 1/4 | 20 | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1 1/2 | 24 | 3,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 2 | 32 | 3,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 000000 |
Locknuts for Metal Conduit Fittings
Steel, 316 Stainless Steel,
Aluminum, and Brass
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 NPT and NPSM threads.
Locknuts with a PVC molded gasket create a seal for moisture protection.
Locknuts with serrated facing grip the material surface for more stability, compared to locknuts with smooth facing.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||
|---|---|---|---|---|
NPSM Threads | ||||
| 1/2 | UL Listed, CSA Certified | 10 | 00000000 | 00000 |
| 3/4 | UL Listed, CSA Certified | 10 | 00000000 | 0000 |
| 1 | UL Listed, CSA Certified | 10 | 00000000 | 0000 |
| 1 1/4 | UL Listed, CSA Certified | 10 | 00000000 | 0000 |
| 1 1/2 | UL Listed, CSA Certified | 10 | 00000000 | 0000 |
| 2 | UL Listed, CSA Certified | 10 | 00000000 | 00000 |
| Each | ||||
| 2 1/2 | CSA Certified | __ | 00000000 | 0000 |
| 3 | CSA Certified | __ | 00000000 | 0000 |
| 3 1/2 | CSA Certified | __ | 00000000 | 0000 |
| 4 | CSA Certified | __ | 00000000 | 0000 |
| Pkg. | ||||
Zinc-Plated Steel with PVC Molded Gasket | ||||
NPSM Threads | ||||
| 1/2 | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 3/4 | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 1 | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 1 1/4 | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 1 1/2 | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 2 | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| Each | ||||
| 2 1/2 | CSA Certified | __ | 00000000 | 00000 |
| 3 | CSA Certified | __ | 00000000 | 00000 |
| 3 1/2 | CSA Certified | __ | 00000000 | 00000 |
| 4 | CSA Certified | __ | 00000000 | 00000 |
Zinc-Plated Steel with Serrated Facing | ||||
NPSM Threads | ||||
| 1/2 | UL Listed, CSA Certified | __ | 00000000 | 000 |
| 1 | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 1 1/4 | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 1 1/2 | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 2 | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 2 1/2 | CSA Certified | __ | 00000000 | 0000 |
| 3 | CSA Certified | __ | 00000000 | 00000 |
| 3 1/2 | CSA Certified | __ | 00000000 | 00000 |
| 4 | CSA Certified | __ | 00000000 | 00000 |
Steel Hex Panel Nuts
Fasten these panel nuts with a wrench for more torque while tightening than knurled panel nuts. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels.
Zinc-plated steel nuts resist corrosion in wet environments.
Black-oxide steel nuts have a dark surface color.
For technical drawings and 3-D models, click on a part number.
NPSM Threads
| UNEF Threads
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Knurled Panel Nuts
These panel nuts are knurled to provide a secure grip for tightening and loosening by hand. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels. They're zinc plated to resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.