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 Stainless Steel Threaded Pipe Fittings
Use these fittings in a low-pressure pipe line.
Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
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, Natural Gas, Oil, Steam, Water
- Pressure Class:
NPSL: 150 - Fabrication:
NPSL: Heat Treated - Specifications Met:
NPSL: ANSI/MSS SP-114, ASTM A351
BSPP: DIN 431 - Pipe Nipples and Pipe:
NPSL: Use Schedule 40 stainless steel - Flanges:
NPSL: Use Class 150 stainless steel
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.
- 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 |
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.
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: 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 | Pressure Class | Material | Schedule | Material | Class | Material | For Use With | Specifications Met | Each | |
NPSL Female | |||||||||||
| 3 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Natural Gas, Oil | ASME B16.15 | 00000000 | 000000 |
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 | |||
|---|---|---|---|
| 3 | 150 psi @ 72° F | 000000000 | 000000 |
Locknuts for Metal Conduit Fittings
Steel, 316 Stainless
Steel, and Aluminum
Steel with
Serrated Facing
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.
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.
| Pipe Size | Specifications Met | Each | |
Zinc-Plated Steel | |||
|---|---|---|---|
NPSM Threads | |||
| 3 | CSA Certified | 00000000 | 00000 |
Zinc-Plated Steel with PVC Molded Gasket | |||
NPSM Threads | |||
| 3 | CSA Certified | 00000000 | 00000 |
Zinc-Plated Steel with Serrated Facing | |||
NPSM Threads | |||
| 3 | CSA Certified | 00000000 | 00000 |
316 Stainless Steel | |||
NPSL | |||
| 3 | UL Listed, C-UL Listed | 00000000 | 00000 |