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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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FM-Approved Low-Pressure Cast Iron Threaded Pipe Flanges
Front
Flat Surface on Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met:
3/4 Pipe Size: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
All other sizes: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved, UL Listed - Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Class 125 or 150 iron and steel
Suitable for use in fire-protection applications, these flanges are brittle and can be quickly opened with the strike of a sledge hammer. Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line. Use in noncorrosive environments.
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 | Material | Each | |
NPT | ||||||||||
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 00000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
| 5 | 10" | 3/4" | 7/8" | 8 | 8 1/2" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 125 psi @ 72° F | 125 psi @ 350° F | Black-Coated Iron | 000000000 | 000000 |
Low-Pressure Steel Threaded Pipe Flanges
Use these flanges for low-pressure applications in noncorrosive environments. Bolt two flanges of the same size 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.
Flanges
Front
Raised Surface on Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met:
NPT: ASME B16.5, ASTM A105, MSS SP-25
BSPT: ASTM A105 - Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Class 125 or 150 iron and steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Material | Each | |
BSPT | ||||||||||
| 1/2 | 3 1/2" | 5/8" | 5/8" | 4 | 2 3/8" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 3/4 | 3 7/8" | 5/8" | 5/8" | 4 | 2 3/4" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 00000 |
| 1 | 4 1/4" | 5/8" | 5/8" | 4 | 3 1/8" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 00000 |
| 1 1/4 | 4 5/8" | 5/8" | 5/8" | 4 | 3 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 00000 |
| 1 1/2 | 5" | 5/8" | 0.62" | 4 | 3 7/8" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 00000 |
| 2 | 6" | 3/4" | 3/4" | 4 | 4 3/4" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 00000 |
| 2 1/2 | 7" | 3/4" | 3/4" | 4 | 5 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 3 | 7 1/2" | 3/4" | 3/4" | 4 | 6" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 00000 |
| 4 | 9" | 3/4" | 3/4" | 8 | 7 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 6 | 11" | 7/8" | 7/8" | 8 | 9 1/2" | 285 psi @ 72° F | 230 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |