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Connection Style Connection Style |
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| Butt Weld |
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| Slip-On Weld |
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| Socket Connect |
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| Threaded |
Maximum Pressure Maximum Pressure |
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For Use With For Use With |
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Maximum Steam Pressure Maximum Steam Pressure |
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Specifications Met Specifications Met |
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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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Extreme-Pressure Steel Unthreaded Pipe Flanges
For excellent strength in extreme-pressure applications, choose these heavy duty Class 1500 flanges. Bolt two same-size flanges together with a gasket (sold separately) to create an access point in a pipe line. They are for noncorrosive environments.
Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld.
Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.
Socket-connect flanges have an internal stop that supports the pipe when welding and prevents the pipe from sliding all the way through.
Cap flanges are also known as blind flanges.
For technical drawings and 3-D models, click on a part number.
Butt-Weld Flanges
Front
Raised Surface on Back
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Class: 1500
- Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ANSI/ASME B16.5
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Fittings: Use Class 6000 steel
- Pipe Nipples and Pipe: Use Schedule XXH steel
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Wall Thick. | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
| 1/2 | 08 | 0.294" | 4 3/4" | 3/4" | 7/8" | 4 | 3 1/4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 3/4 | 12 | 0.308" | 5 1/8" | 3/4" | 7/8" | 4 | 3 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 00000 |
| 1 | 16 | 0.358" | 5 7/8" | 7/8" | 1" | 4 | 4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 1/4 | 20 | 0.382" | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 1/2 | 24 | 0.4" | 7" | 1" | 1 1/8" | 4 | 4 7/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 2 | 32 | 0.436" | 8 1/2" | 7/8" | 1" | 8 | 6 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 3 | 48 | 0.6" | 10 1/2" | 1 1/4" | 1 1/4" | 8 | 8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 4 | 64 | 0.674" | 12 1/4" | 1.38" | 1.38" | 8 | 9 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
Slip-On Weld Flanges
Front
Raised Surface on Back
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Class: 1500
- Specifications Met: See table
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Fittings: Use Class 6000 steel
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Specifications Met | Each | |
| 1/2 | 08 | 4 3/4" | 3/4" | 7/8" | 4 | 3 1/4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 | 0000000 | 0000000 |
| 3/4 | 12 | 5 1/8" | 3/4" | 7/8" | 4 | 3 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 | 0000000 | 000000 |
| 1 | 16 | 5 7/8" | 7/8" | 1" | 4 | 4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 | 0000000 | 000000 |
| 1 1/4 | 20 | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 | 0000000 | 000000 |
| 1 1/2 | 24 | 7" | 1" | 1 1/8" | 4 | 4 7/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 | 0000000 | 000000 |
| 2 | 32 | 8 1/2" | 7/8" | 1" | 8 | 6 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 | 0000000 | 000000 |
| 3 | 48 | 10 1/2" | 1 1/4" | 1 1/4" | 8 | 8" | Not Rated | Not Rated | ASTM A105 | 0000000 | 000000 |
| 4 | 64 | 12 1/4" | 1.38" | 1.38" | 8 | 9 1/2" | Not Rated | Not Rated | ASTM A105 | 0000000 | 000000 |
Socket-Connect Flanges
Front
Raised Surface on Back
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Class: 1500
- Specifications Met:
3 and 4 Pipe Sizes: ASTM A105
All other sizes: ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6 - Certification: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Fittings: Use Class 6000 steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
| 1/2 | 08 | 4 3/4" | 3/4" | 7/8" | 4 | 3 1/4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 0000000 |
| 3/4 | 12 | 5 1/8" | 3/4" | 7/8" | 4 | 3 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 | 16 | 5 7/8" | 7/8" | 1" | 4 | 4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 1/4 | 20 | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 1/2 | 24 | 7" | 1" | 1 1/8" | 4 | 4 7/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 2 | 32 | 8 1/2" | 7/8" | 1" | 8 | 6 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 3 | 48 | 10 1/2" | 1 1/4" | 1 1/4" | 8 | 8" | Not Rated | Not Rated | 0000000 | 000000 |
| 4 | 64 | 12 1/4" | 1.38" | 1.38" | 8 | 9 1/2" | Not Rated | Not Rated | 0000000 | 000000 |
Caps
Front
Raised Surface on Back
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Class: 1500
- Specifications Met: MSS SP-6, MSS SP-25, ASTM A105, ANSI/ASME B16.5
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Fittings: Use Class 6000 steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
| 1/2 | 08 | 4 3/4" | 3/4" | 7/8" | 4 | 3 1/4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 0000000 |
| 3/4 | 12 | 5 1/8" | 3/4" | 7/8" | 4 | 3 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 | 16 | 5 7/8" | 7/8" | 1" | 4 | 4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 1/4 | 20 | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 1 1/2 | 24 | 7" | 1" | 1 1/8" | 4 | 4 7/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 2 | 32 | 8 1/2" | 7/8" | 1" | 8 | 6 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 3 | 48 | 10 1/2" | 1 1/4" | 1 1/4" | 8 | 8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
| 4 | 64 | 12 1/4" | 1.38" | 1.38" | 8 | 9 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | 0000000 | 000000 |
High-Pressure Steel Threaded Pipe Flanges
Front
Raised Surface on Back
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Class: 1500
- Specifications Met:
1/2 to 2 Pipe Sizes: ANSI/ASME B16.5, ASTM A105, MSS SP-25, MSS SP-6
All other sizes: ASTM A105 - Pipe Nipples and Pipe: Use Schedule 160 or XXH steel
- Fittings: Use Class 3000 or 6000 iron and steel
Also known as Class 1500 flanges, these have the strength to handle high pressures. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are for use in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT | |||||||||||
| 1/2 | 08 | 4 3/4" | 3/4" | 7/8" | 4 | 3 1/4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Black-Coated Steel | 0000000 | 0000000 |
| 3/4 | 12 | 5 1/8" | 3/4" | 7/8" | 4 | 3 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 1 | 16 | 5 7/8" | 7/8" | 1" | 4 | 4" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 1 1/4 | 20 | 6 1/4" | 7/8" | 1" | 4 | 4 3/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 1 1/2 | 24 | 7" | 1" | 1 1/8" | 4 | 4 7/8" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 2 | 32 | 8 1/2" | 7/8" | 1" | 8 | 6 1/2" | 3,700 psi @ 72° F | 3,200 psi @ 300° F | Black-Coated Steel | 0000000 | 000000 |
| 3 | 48 | 10 1/2" | 1 1/4" | 1 1/4" | 8 | 8" | Not Rated | Not Rated | Black-Coated Steel | 0000000 | 000000 |
| 4 | 64 | 12 1/4" | 1.38" | 1.38" | 8 | 9 1/2" | Not Rated | Not Rated | Black-Coated Steel | 0000000 | 000000 |