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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About Hex Head Screws and Bolts
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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 |
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 |
Steel Hex Screw and Nut Kits for Pipe Flanges
Connect standard-sized steel and cast iron pipe flanges. These kits come with the right size and number of screws and nuts for the bolt holes in each pipe size. For a tight seal, you’ll also need a gasket between the flanges. All screws and nuts meet ASTM and ASME standards or DIN standards for material quality and dimensions. Screw length is measured from under the head.
Hot-dipped galvanized fasteners are 10 times more corrosion resistant than zinc-plated fasteners.
Screw | Nut | Hot-Dipped Galvanized Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size | Lg. | Min. Thread Lg. | Head Wd. | Head Ht. | Tensile Strength, psi | Wd. | Ht. | No. of Screws Included | No. of Nuts Included | Each | |
1/2"-13 | |||||||||||
| 1/2, 3/4 | 2" | 1 1/4" | 3/4" | 11/32" | 60,000 | 3/4" | 7/16" | 4 | 4 | 000000000 | 00000 |
| 1, 1 1/4 | 2 1/4" | 1 1/4" | 3/4" | 11/32" | 60,000 | 3/4" | 7/16" | 4 | 4 | 000000000 | 0000 |
| 1 1/2 | 2 1/2" | 1 1/4" | 3/4" | 11/32" | 60,000 | 3/4" | 7/16" | 4 | 4 | 000000000 | 0000 |
5/8"-11 | |||||||||||
| 2 | 2 3/4" | 1 1/2" | 15/16" | 27/64" | 60,000 | 15/16" | 35/64" | 4 | 4 | 000000000 | 0000 |
| 2 1/2, 3 | 3" | 1 1/2" | 15/16" | 27/64" | 60,000 | 15/16" | 35/64" | 4 | 4 | 000000000 | 0000 |
| 3 1/2, 4 | 3" | 1 1/2" | 15/16" | 27/64" | 60,000 | 15/16" | 35/64" | 8 | 8 | 000000000 | 00000 |
3/4"-10 | |||||||||||
| 5, 6 | 3 1/4" | 1 3/4" | 1 1/8" | 1/2" | 60,000 | 1 1/8" | 41/64" | 8 | 8 | 000000000 | 00000 |
7/8"-9 | |||||||||||
| 10, 12 | 4" | 2" | 1 5/16" | 37/64" | 60,000 | 1 5/16" | 3/4" | 12 | 12 | 000000000 | 00000 |
Screw | Nut | Hot-Dipped Galvanized Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size | Lg. | Min. Thread Lg. | Head Wd. | Head Ht. | Tensile Strength, psi | Wd. | Ht. | No. of Screws Included | No. of Nuts Included | Each | |
1/2"-13 | |||||||||||
| 1/2 | 2 1/4" | 1 1/4" | 3/4" | 11/32" | 60,000 | 3/4" | 7/16" | 4 | 4 | 000000000 | 00000 |
5/8"-11 | |||||||||||
| 3/4, 1 | 2 1/2" | 1 1/2" | 15/16" | 27/64" | 60,000 | 15/16" | 35/64" | 4 | 4 | 000000000 | 0000 |
| 1 1/4 | 2 3/4" | 1 1/2" | 15/16" | 27/64" | 60,000 | 15/16" | 35/64" | 4 | 4 | 000000000 | 0000 |
| 2 | 3" | 1 1/2" | 15/16" | 27/64" | 60,000 | 15/16" | 35/64" | 8 | 8 | 000000000 | 00000 |
3/4"-10 | |||||||||||
| 1 1/2 | 3" | 1 3/4" | 1 1/8" | 1/2" | 60,000 | 1 1/8" | 41/64" | 4 | 4 | 000000000 | 0000 |
| 2 1/2 | 3 1/4" | 1 3/4" | 1 1/8" | 1/2" | 60,000 | 1 1/8" | 41/64" | 8 | 8 | 000000000 | 00000 |
| 3 | 3 1/2" | 1 3/4" | 1 1/8" | 1/2" | 60,000 | 1 1/8" | 41/64" | 8 | 8 | 000000000 | 00000 |
| 3 1/2, 4 | 3 3/4" | 1 3/4" | 1 1/8" | 1/2" | 60,000 | 1 1/8" | 41/64" | 8 | 8 | 000000000 | 00000 |
| 6 | 4 1/4" | 1 3/4" | 1 1/8" | 1/2" | 60,000 | 1 1/8" | 41/64" | 12 | 12 | 000000000 | 00000 |
7/8"-9 | |||||||||||
| 8 | 4 3/4" | 2" | 1 5/16" | 37/64" | 60,000 | 1 5/16" | 3/4" | 12 | 12 | 000000000 | 000000 |
Steel Heavy Hex Screw and Nut Kits for Pipe Flanges
Join standard-sized steel and cast iron pipe flanges—these kits come with the screws and nuts in the right size and number to match the bolt holes. The screw heads and nuts are 10% wider than standard hex fasteners, so they spread force over a larger area, and you can tighten with more torque. For a complete connection, you’ll also need a gasket. All fasteners meet ASME specifications for dimensions and ASTM specifications for material quality. Screw length is measured from under the head.
Hot-dipped galvanized steel fasteners are 10 times more corrosion resistant than zinc-plated fasteners.
Screw | Nut | Hot-Dipped Galvanized | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size | Lg. | Min. Thread Lg. | Head Wd. | Head Ht. | Tensile Strength, psi | Wd. | Ht. | No. of Screws Included | No. of Nuts Included | Each | |
5/8"-11 | |||||||||||
| 2 | 2 3/4" | 1 1/2" | 1 1/16" | 27/64" | 60,000 | 1 1/16" | 39/64" | 4 | 4 | 000000000 | 000000 |
| 2 1/2, 3 | 3" | 1 1/2" | 1 1/16" | 27/64" | 60,000 | 1 1/16" | 39/64" | 4 | 4 | 000000000 | 00000 |
| 3 1/2, 4 | 3" | 1 1/2" | 1 1/16" | 27/64" | 60,000 | 1 1/16" | 39/64" | 8 | 8 | 000000000 | 00000 |
3/4"-10 | |||||||||||
| 5, 6 | 3 1/4" | 1 3/4" | 1 1/4" | 1/2" | 60,000 | 1 1/4" | 47/64" | 8 | 8 | 000000000 | 00000 |
Screw | Nut | Hot-Dipped Galvanized | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size | Lg. | Min. Thread Lg. | Head Wd. | Head Ht. | Tensile Strength, psi | Wd. | Ht. | No. of Screws Included | No. of Nuts Included | Each | |
5/8"-11 | |||||||||||
| 2 | 3" | 1 1/2" | 1 1/16" | 27/64" | 60,000 | 1 1/16" | 39/64" | 8 | 8 | 000000000 | 000000 |
3/4"-10 | |||||||||||
| 3 | 3 1/2" | 1 3/4" | 1 1/4" | 1/2" | 60,000 | 1 1/4" | 47/64" | 8 | 8 | 000000000 | 00000 |
| 4 | 3 3/4" | 1 3/4" | 1 1/4" | 1/2" | 60,000 | 1 1/4" | 47/64" | 8 | 8 | 000000000 | 00000 |
| 6 | 4 1/4" | 1 3/4" | 1 1/4" | 1/2" | 60,000 | 1 1/4" | 47/64" | 12 | 12 | 000000000 | 000000 |