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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 Stainless Steel Threaded Pipe Flanges
Also known as Pressure Class 150 flanges, these are designed for low-pressure pipe applications. Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (sold separately) to create an access point within a line. Alloy 20 stainless steel flanges have the best corrosion resistance of all the stainless steel flanges we offer. Alloy 20 stainless steel is also known as Carpenter 20 and resists cracking from stress and corrosion.
Forged flanges have better strength than cast flanges. They are also called ANSI flanges.
Flanges—Forged
Front
Raised Surface on Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met:
Alloy 20 flanges: ASME B16.5
All other flanges: ASME B16.5, ASTM A182 - Fittings: Use Class 150 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | Alloy 20 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|
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" | 0.62" | 4 | 2 3/8" | 290 psi @ 72° F | 200 psi @ 360° F | 0000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 0.62" | 4 | 2 3/4" | 290 psi @ 72° F | 200 psi @ 360° F | 0000000 | 000000 |
| 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 290 psi @ 72° F | 200 psi @ 360° F | 0000000 | 000000 |
| 1 1/2 | 5" | 1/2" | 0.62" | 4 | 3 7/8" | 290 psi @ 72° F | 200 psi @ 360° F | 0000000 | 000000 |
| 2 | 6" | 5/8" | 0.75" | 4 | 4 3/4" | 290 psi @ 72° F | 200 psi @ 360° F | 0000000 | 000000 |