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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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Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections. They have a gasket that creates a tight seal.
For technical drawings and 3-D models, click on a part number.
Straight Connectors
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 steel
Union Straight Connectors
Hex Nut-Exploded View
Octagon Nut-Exploded View
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 steel
| Pipe Size  | Max. Pressure | Max. Steam Pressure | Body Shape | Material | Gasket Material | Specifications Met | Each | |
NPT Female | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | Hex | Iron | Brass | ASME B1.20.1, ASME B16.39 | 000000000 | 000000 |
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Hex | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | Hex | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Octagon | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | Octagon | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | Octagon | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 1 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Hex | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Octagon | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | Octagon | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 000000000 | 00000 |
| 2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Hex | Iron | Brass | ASME B1.20.1, ASME B16.3, ASME B16.39, UL Listed | 00000000 | 000000 |
| 3 | 300 psi @ 72° F | 150 psi @ 350° F | Hex | Iron | Brass | ASME B1.20.1, ASME B16.39, UL Listed | 00000000 | 000000 |
| 4 | 300 psi @ 72° F | 150 psi @ 350° F | Octagon | Iron | Brass | ASME B1.20.1, ASME B16.39 | 000000000 | 000000 |
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.
Union connectors separate so you can access your line without unthreading pipe connections. They have a brass gasket that creates a tight seal.
For technical drawings and 3-D models, click on a part number.
Union Straight Connectors
Exploded View
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
| Pipe Size | Max. Pressure | Max. Steam Pressure | Material | Gasket Material | Specifications Met | Each | |
NPT Female | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197 | 00000000 | 000000 |
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 1 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197, UL Listed | 00000000 | 00000 |
| 2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197 | 00000000 | 000000 |
| 3 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197 | 00000000 | 000000 |
| 4 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197 | 00000000 | 000000 |
Medium-Pressure Iron and Steel Threaded Pipe Fittings
With better strength than our low-pressure iron and steel pipe fittings, these can handle medium-pressure applications. They are for use in noncorrosive environments.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
Union Straight Connectors
Exploded View
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class : 300
- Specifications Met: ASTM A197, UL Listed, ASME B16.39, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 or 600 steel
| Pipe Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | |||||
|---|---|---|---|---|---|
| 1/8 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 000000 |
| 1/4 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 3/8 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 1/2 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 3/4 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 1 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 1 1/4 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 1 1/2 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 2 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 00000 |
| 2 1/2 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 000000 |
| 3 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 000000 |
Union 90° Elbow Connectors
Exploded View
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class : 300
- Specifications Met: ASTM A197, UL Listed, ASME B16.39, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 or 600 steel
Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
Union Straight Connectors
Exploded View
- For Use With: Air, Natural Gas, Steam, Water
- Pressure Class : 300
- Specifications Met: FM Approved, UL Listed, ASTM A197, ASTM A153, ASME B1.20.1, ASME B16.39
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 steel
| Pipe Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | |||||
|---|---|---|---|---|---|
| 1/4 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 000000 |
| 3/8 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 00000 |
| 1/2 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 00000 |
| 3/4 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 00000 |
| 1 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 00000 |
| 1 1/4 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 00000 |
| 1 1/2 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 0000000 | 000000 |
| 2 | 600 psi @ 72° F | 230 psi @ 550° F | Galvanized Iron | 000000 | 000000 |