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 Brass and Bronze Threaded Pipe Fittings
Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.
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 | |||||||||||
| 1/8 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 00000 |
| 1/4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 0000 |
| 3/8 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 0000 |
| 1/2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 0000 |
| 3/4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 0000 |
| 1 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 0000 |
| 1 1/4 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 00000 |
| 1 1/2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 00000 |
| 2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 00000 |
| 2 1/2 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Natural Gas, Oil | ASME B16.15 | 00000000 | 00000 |
| 3 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Natural Gas, Oil | ASME B16.15 | 00000000 | 00000 |
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
304 Stainless Steel | 316 Stainless Steel | |||||
|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | Each | ||
NPSL Female | ||||||
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 0000 |
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 0000 | 00000000 | 00000 |
| 1 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 3 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
| 4 | 300 psi @ 72° F | 150 psi @ 350° F | 00000000 | 00000 | 00000000 | 00000 |
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.
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
- 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
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
- Pressure Class: 150
- Specifications Met: ASME B16.14
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
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 | 00000 |
| 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 |
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.
| Pipe Size | Specifications Met | Each | |
316 Stainless Steel | |||
|---|---|---|---|
NPSL | |||
| 1/2 | UL Listed, C-UL Listed | 00000000 | 000000 |
| 3/4 | UL Listed, C-UL Listed | 00000000 | 00000 |
| 1 | UL Listed, C-UL Listed | 00000000 | 00000 |
| 1 1/2 | UL Listed, C-UL Listed | 00000000 | 00000 |
| 1 1/4 | UL Listed, C-UL Listed | 00000000 | 00000 |
| 2 | UL Listed, C-UL Listed | 00000000 | 00000 |
| 3 | UL Listed, C-UL Listed | 00000000 | 00000 |
| 4 | UL Listed, C-UL Listed | 00000000 | 00000 |