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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 Galvanized Steel Threaded Pipe Flanges
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Class: 150
- Specifications Met: ASTM A123, ASTM A105, ASME B16.5
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Fittings: Use Class 125 or 150 galvanized iron and galvanized steel
The galvanized finish on these flanges provides fair corrosion resistance. Also known as Class 150 flanges, they are for use in low-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.
For technical drawings and 3-D models, click on a part number.
Bolt Hole | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
NPT | |||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 00000 |
| 5 | 10" | 3/4" | 7/8" | 8 | 8 1/2" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 00000000 | 000000 |
BSPT | |||||||||
| 1/2 | 3 1/2" | 5/8" | 0.62" | 4 | 2 3/8" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 00000 |
| 3/4 | 3 7/8" | 5/8" | 0.62" | 4 | 2 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 00000 |
| 1 | 4 1/4" | 5/8" | 0.62" | 4 | 3 1/8" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 00000 |
| 1 1/2 | 5" | 5/8" | 0.62" | 4 | 3 7/8" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 00000 |
| 2 | 6" | 3/4" | 3/4" | 4 | 4 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 000000 |
Medium-Pressure Galvanized Steel Threaded Pipe Flanges
- For Use With: Air, Natural Gas, Steam, Water
- Class: 300
- Specifications Met: ASTM A123, ASTM A105, ASME B16.5
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Fittings: Use Class 300 iron or steel
A galvanized finish gives these flanges fair corrosion resistance. Also known as Class 300 flanges, they can withstand medium-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line.
For technical drawings and 3-D models, click on a part number.
Bolt Hole | ||||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | |
NPT | ||||||||
| 1/2 | 3 3/4" | 5/8" | 0.62" | 4 | 2 5/8" | 600 psi @ 72° F | 0000000 | 000000 |
| 3/4 | 4 5/8" | 3/4" | 3/4" | 4 | 3 1/4" | 600 psi @ 72° F | 0000000 | 000000 |
| 1 | 4 7/8" | 3/4" | 3/4" | 4 | 3 1/2" | 600 psi @ 72° F | 0000000 | 00000 |
| 1 1/4 | 5 1/4" | 3/4" | 3/4" | 4 | 3 7/8" | 600 psi @ 72° F | 0000000 | 000000 |
| 1 1/2 | 6 1/8" | 7/8" | 0.88" | 4 | 4 1/2" | 600 psi @ 72° F | 0000000 | 00000 |
| 2 | 6 1/2" | 3/4" | 3/4" | 8 | 5" | 600 psi @ 72° F | 0000000 | 00000 |
| 3 | 8 1/4" | 7/8" | 0.88" | 8 | 6 5/8" | 600 psi @ 72° F | 0000000 | 000000 |
| 4 | 10" | 7/8" | 0.88" | 8 | 7 7/8" | 600 psi @ 72° F | 0000000 | 000000 |