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
- Pressure 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 Pressure 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.
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 | 000000 |
| 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 | |||||||||
| 2 | 6" | 3/4" | 3/4" | 4 | 4 3/4" | 285 psi @ 72° F | 150 psi @ 300° F | 000000 | 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.
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 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
Medium-Pressure Galvanized Steel Threaded Pipe Flanges
- For Use With: Air, Natural Gas, Steam, Water
- Pressure 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 Pressure 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.
Bolt Hole | ||||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | |
NPT | ||||||||
| 3/4 | 4 5/8" | 3/4" | 3/4" | 4 | 3 1/4" | 600 psi @ 72° F | 0000000 | 0000000 |
| 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 | 000000 |
| 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 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications.
Galvanized and zinc-plated steel fittings have better corrosion resistance than plain steel fittings. PTFE-coated steel fittings have better corrosion resistance than galvanized and zinc-plated steel fittings.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range: -100° to 500° F
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 02 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 000000 |
| 1/4 | 04 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 3/8 | 06 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1/2 | 08 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 3/4 | 12 | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1 | 16 | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1 1/4 | 20 | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 1 1/2 | 24 | 3,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 00000 |
| 2 | 32 | 3,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 000000 |