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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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.
Straight connectors with recessed threading have a short unthreaded space on each end, which allows for easy alignment when threading onto long lengths of pipe. They are also known as API line couplings.
- For Use With: Air, Water, Oil, Natural Gas
- Specifications Met: ASTM A105, ASTM A53
- Pipe Nipples and Pipe: Use Schedule 160 or 80 steel
- Flanges: Use Class 300 or 600 steel
Pipe Size | Max. Pressure | Material | Each | |
NPT Female | ||||
|---|---|---|---|---|
| 1/8 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 1/4 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 3/8 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 1/2 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 3/4 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 1 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 1 1/4 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 1 1/2 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 2 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 3 | 300 psi @ 72° F | Steel | 000000000 | 00000 |
| 4 | 300 psi @ 72° F | Steel | 000000000 | 000000 |
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.
Straight connectors with recessed threading have a short unthreaded space on each end, which allows for easy alignment when threading onto long lengths of pipe. They are also known as API line couplings.
- For Use With: Air, Water, Oil, Natural Gas
- Specifications Met: ASTM A105, ASTM A53
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 steel
| Pipe Size | Max. Pressure | Material | Each | |
NPT Female | ||||
|---|---|---|---|---|
| 1/8 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 000000 |
| 1/4 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 3/8 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 1/2 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 3/4 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 1 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 1 1/4 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 1 1/2 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 2 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 00000 |
| 3 | 300 psi @ 72° F | Galvanized Steel | 000000000 | 000000 |