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 Unthreaded Pipe Flanges
Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a
Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides. Reducing flanges let you transition your piping system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions. Forged flanges have better strength than cast flanges. 304 stainless steel flanges offer very good corrosion resistance, and 316 stainless steel flanges have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met: ASME B16.5
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | For Flange Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Diameter | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||||||
| 3/4 | 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 1 1/2 | 5" | 1/2" | 0.62" | 4 | 3 7/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 1/2 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 4 | 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 6 | 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
316/316L Stainless Steel | ||||||||||
| 3/4 | 1 | 4 1/4" | 1/2" | 0.62" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 1 1/2 | 5" | 1/2" | 0.62" | 4 | 3 7/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 1 1/2 | 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3 | 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 4 | 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
Aluminum Unthreaded Pipe Flanges
Also known as Pressure Class 125 flanges, these 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. Flanges are aluminum, which is lightweight with good corrosion resistance. Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides. Reducing flanges let you transition your system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Oil, Water
- Pressure Class: 125
- Specifications Met: ASME B16.1
- Fittings: Use Schedule 40 aluminum
- Pipe: Use Schedule 40 aluminum