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For Pipe Material For Pipe Material |
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Flange OD Flange OD |
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For Use With For Use With |
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Maximum Pressure Maximum Pressure |
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Bolt Circle Diameter Bolt Circle Diameter |
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 | Straight |
Wall Thickness Wall Thickness |
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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 Steel Unthreaded Pipe Flanges
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 in a pipe line. Flanges are for use with low-pressure applications in 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.
For technical drawings and 3-D models, click on a part number.
Inch Butt-Weld Flanges
Front
Raised Surface on Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Class: See table
- Specifications Met: See table
- Certification: See table
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Schedule 40 iron or steel
Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Wall Thick. | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Class | Construction | Max. Pressure | Max. Steam Pressure | Certification | Specifications Met | Each | |
| 1/2 | 0.109" | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 000000 |
| 3/4 | 0.113" | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 1 | 0.133" | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 1 | 0.144" | 4 59/64" | 5/8" | 0.748" | 4 | 3 35/64" | __ | Seamless | Not Rated | Not Rated | __ | ASTM A105, JIS 10K 25A, JIS B2220 | 0000000 | 00000 |
| 1 1/4 | 0.14" | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 1 1/2 | 0.137" | 5 33/64" | 5/8" | 3/4" | 4 | 4 9/64" | __ | Seamless | Not Rated | Not Rated | __ | ASTM A105, JIS 10K 40A, JIS B2220 | 0000000 | 00000 |
| 1 1/2 | 0.145" | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 2 | 0.154" | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 2 | 0.157" | 6 7/64" | 5/8" | 3/4" | 4 | 4 23/32" | __ | Seamless | Not Rated | Not Rated | __ | ASTM A105, JIS 10K 50A, JIS B2220 | 0000000 | 00000 |
| 2 1/2 | 0.203" | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 3 | 0.216" | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 4 | 0.237" | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 5 | 0.258" | 10" | 3/4" | 7/8" | 8 | 8 1/2" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 6 | 0.28" | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 00000 |
| 8 | 0.322" | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 000000000 | 000000 |
| 10 | 0.365" | 16" | 7/8" | 1" | 12 | 14 1/4" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 00000000 | 000000 |
| 12 | 0.406" | 19" | 7/8" | 1" | 12 | 17" | 150 | Seamless | 285 psi @ 72° F | 150 psi @ 300° F | Material Certificate with Traceable Lot Number and Test Report | ANSI/ASME B16.5, ASTM A105, MSS SP-25 | 00000000 | 000000 |
Metric Butt-Weld Flanges
Front
Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: DIN 2633, DIN 86030, DIN EN 1092-1, DIN 2527
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Schedule 40 iron or steel
Bolt Hole | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | DN Flange Size | Wall Thick., mm | Flange OD, mm | For Bolt Dia., mm | Dia. | No. of | Bolt Circle Dia., mm | Construction | Max. Pressure | Max. Steam Pressure | Each | |
| 1 | 25 | 3.378 | 115 | 12 | 14 | 4 | 85 | Welded | 230 psi @ 72° F | 180 psi @ 300° F | 0000000 | 000000 |
| 2 | 50 | 3.912 | 165 | 16 | 18 | 4 | 125 | Welded | 230 psi @ 72° F | 180 psi @ 300° F | 0000000 | 00000 |
| 3 | 80 | 5.486 | 200 | 16 | 18 | 8 | 160 | Welded | 230 psi @ 72° F | 180 psi @ 300° F | 0000000 | 00000 |
| 4 | 100 | 6.02 | 220 | 16 | 18 | 8 | 180 | Welded | 230 psi @ 72° F | 180 psi @ 300° F | 0000000 | 00000 |
High-Pressure Steel Unthreaded Pipe Flanges
Forged for extra strength, these heavy duty flanges can withstand high-pressure 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 in a pipe line.
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.
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: See table
- Specifications Met: ASTM A105, ANSI/ASME B16.5
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Fittings: Use Class 3000 and Schedule 80 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 | Material | Each | |
300 Class | ||||||||||||
| 1/2 | 08 | 0.147" | 3 3/4" | 1/2" | 5/8" | 4 | 2 5/8" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 3/4 | 12 | 0.154" | 4 5/8" | 5/8" | 3/4" | 4 | 3 1/4" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 1 | 16 | 0.179" | 4 7/8" | 5/8" | 3/4" | 4 | 3 1/2" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 1 1/4 | 20 | 0.191" | 5 1/4" | 5/8" | 3/4" | 4 | 3 7/8" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 1 1/2 | 24 | 0.2" | 6 1/8" | 3/4" | 7/8" | 4 | 4 1/2" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 2 | 32 | 0.218" | 6 1/2" | 5/8" | 3/4" | 8 | 5" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 2 1/2 | 40 | 0.276" | 7 1/2" | 3/4" | 7/8" | 8 | 5 7/8" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 3 | 48 | 0.3" | 8 1/4" | 3/4" | 7/8" | 8 | 6 5/8" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 4 | 64 | 0.337" | 10" | 3/4" | 7/8" | 8 | 7 7/8" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 5 | __ | 0.375" | 11" | 3/4" | 7/8" | 8 | 9 1/4" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 6 | 96 | 0.432" | 12 1/2" | 3/4" | 7/8" | 12 | 10 5/8" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 8 | __ | 0.5" | 15" | 7/8" | 1" | 12 | 13" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 10 | __ | 0.594" | 17 1/2" | 1.12" | 1.12" | 16 | 15 1/4" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 12 | __ | 0.688" | 20 1/2" | 1 1/4" | 1 1/4" | 16 | 17 3/4" | 600 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
600 Class | ||||||||||||
| 1 | 16 | 0.179" | 4.88" | 3/4" | 3/4" | 4 | 3 1/2" | 1,400 psi @ 72° F | 1,300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 1 1/2 | 24 | 0.2" | 6.12" | 0.88" | 0.88" | 4 | 4 1/2" | 1,400 psi @ 72° F | 1,300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 2 | 32 | 0.218" | 6 1/2" | 3/4" | 3/4" | 8 | 5" | 1,400 psi @ 72° F | 1,300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 3 | 48 | 0.3" | 8 1/4" | 0.88" | 0.88" | 8 | 6.62" | 1,400 psi @ 72° F | 1,300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 4 | 64 | 0.337" | 10 3/4" | 1" | 1" | 8 | 8 1/2" | 1,400 psi @ 72° F | 1,300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 6 | 96 | 0.432" | 14" | 1.12" | 1.12" | 12 | 11 1/2" | 1,400 psi @ 72° F | 1,300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
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.
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 |
Low-Pressure Stainless Steel Unthreaded Pipe Flanges
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 in a pipe line.
304 stainless steel flanges offer very good corrosion resistance, and 316 stainless steel flanges have excellent corrosion resistance.
Forged flanges have better strength than cast flanges.
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.
For technical drawings and 3-D models, click on a part number.
Inch Butt-Weld Flanges—Forged
Front
Raised Surface on Back
- For Use With: Air, Water, Oil, Natural Gas
- Class: 150
- Specifications Met: ASTM A182, ANSI/ASME B16.5
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Construction | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | |
304/304L Stainless Steel | |||||||||
| 1/2 | Seamless | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 |
| 3/4 | Seamless | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 | Seamless | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | Seamless | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | Seamless | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 6 | Seamless | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 8 | Seamless | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 10 | Seamless | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 12 | Seamless | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 |
316/316L Stainless Steel | |||||||||
| 1/2 | Seamless | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 3/4 | Seamless | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 | Seamless | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | Seamless | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | Seamless | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 6 | Seamless | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 |
| 8 | Seamless | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 10 | Seamless | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 12 | Seamless | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 |
Metric Butt-Weld Flanges—Forged
Raised Surface on Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: DIN EN 1092-1
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | DN Flange Size | Construction | Flange OD, mm | For Bolt Dia., mm | Dia., mm | No. of | Bolt Circle Dia., mm | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | |||||||||||
| 1 | 25 | Seamless | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 0000000 |
| 2 | 50 | Seamless | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | Seamless | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | Seamless | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 6 | 150 | Seamless | 285 | 20 | 22 | 8 | 240 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
316/316L Stainless Steel | |||||||||||
| 1 | 25 | Seamless | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 2 | 50 | Seamless | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | Seamless | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | Seamless | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 6 | 150 | Seamless | 285 | 20 | 22 | 8 | 240 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
High-Pressure Stainless Steel Unthreaded Pipe Flanges
Use these heavy duty forged flanges for high-pressure applications. Bolt two flat-surface flanges or two raised-surface flanges of same size together with a gasket (sold separately) to create an access point in a pipe line.
304 stainless steel flanges offer very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance.
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.
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: See table
- Specifications Met:
300 Class: ANSI/ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
600 Class: ANSI/ASME B16.5, ASTM A182 - Certification: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Fittings: Use Schedule 40 stainless steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||||||
300 Class | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 4 | 64 | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 6 | 96 | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 8 | __ | 15" | 7/8" | 1" | 12 | 13" | 600 psi @ 72° F | 300 psi @ 360° F | 0000000 | 000000 |
| 10 | __ | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 600 psi @ 72° F | 300 psi @ 360° F | 0000000 | 000000 |
600 Class | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.62" | 4 | 2 5/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 00000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.88" | 8 | 5 7/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.88" | 8 | 6 5/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 4 | 64 | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||
300 Class | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 4 | 64 | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 6 | 96 | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 8 | __ | 15" | 7/8" | 1" | 12 | 13" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 10 | __ | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 600 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
600 Class | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.62" | 4 | 2 5/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 00000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.88" | 8 | 5 7/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.88" | 8 | 6 5/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 4 | 64 | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
Aluminum Unthreaded Pipe Flanges
Also known as 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.
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.
For technical drawings and 3-D models, click on a part number.
Butt-Weld Flanges
Front
Flat Surface on Back
- For Use With: Air, Oil, Water
- Class: 125
- Specifications Met: ANSI/ASME B16.1
- Fittings: Use Schedule 40 aluminum
- Pipe: Use Schedule 40 aluminum
Bolt Hole | ||||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | |
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 150 psi @ 72° F | 000000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 150 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 150 psi @ 72° F | 000000000 | 00000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 150 psi @ 72° F | 000000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 3/4" | 8 | 11 3/4" | 150 psi @ 72° F | 000000000 | 000000 |
Ultra-High-Vacuum Flanges and
Fittings for Stainless Steel Tubing
- For Use With: Air
- Temperature Range:
Flanges: -300° to 800° F
Gaskets: Not Rated - Tubing: Use with 304/304L and 316/316L stainless steel
- Specifications Met:
Flanges: ASTM A240, ASTM E45, ASTM E12
Gaskets: ASTM B152-179, ASTM F68
Create access points in ultra-high-vacuum lines or chambers by bolting two same-size flanges together with a copper gasket (sold separately) between them. The flanges’ sharp edges dig into the copper gasket and form an extremely tight seal, which means they handle higher vacuum pressures than other high-vacuum fittings with rubber gaskets. Also known as CF, Conflat, and UHV fittings, use them in vacuum coating, heat treating, and drying applications, as well as for leak testing and analyzing gases. They’re stainless steel so they resist rusting.
Fittings with a rotating flange turn so you can easily match up the bolt holes with another flange that may be misaligned.
Butt-weld flanges provide a flush connection for smooth flow through your line.
Bolt kits are required to make a complete connection.
For technical drawings and 3-D models, click on a part number.
Butt-Weld Flanges
Butt-Weld Fixed Flange
Butt-Weld Rotating Flange
Butt-Weld Tube Connection | Flanged Tube Connection | Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Wall Thick. | For Tube OD | Flange OD | Trade Number | High Vacuum Connection Type | Bolt Circle Dia. | Dia. | No. of | Bolts Included | No. of Bolt Kits Required | Lg. | Max. Vacuum | Material | Appearance | Each | |
Fixed | ||||||||||||||||
| 3/4" | 0.049" | 3/4" | 1 21/64" | 16 | CF | 1 1/16" | 11/64" | 6 | No | 1 | 1 1/2" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 3/4" | 0.06" | 3/4" | 1 21/64" | 16 | CF | 1 1/16" | 11/64" | 6 | No | 1 | 9/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 1 1/2" | 0.065" | 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | No | 1 | 2 15/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 2 1/2" | 0.065" | 2 1/2" | 4 1/2" | 63 | CF | 3 5/8" | 21/64" | 8 | No | 1 | 3 3/8" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 4" | 0.083" | 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 4 | 4 5/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
Rotating | ||||||||||||||||
| 3/4" | 0.06" | 3/4" | 1 21/64" | 16 | CF | 1 1/16" | 11/64" | 6 | No | 1 | 9/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
Bolt Kits
Bolt Kit
| For Flange OD | For Trade Number | Bolt Dia. | Thread Size | No. of Bolts Included | No. of Nuts Included | No. of Washers Included | Bolt Material | Each | |
| 1 21/64" | 16 | 0.167" | 8"-32 | 6 | 6 | 12 | 18-8 Stainless Steel | 0000000 | 00000 |
| 2 3/4" | 40 | 1/4" | 1/4"-28 | 6 | 6 | 12 | 18-8 Stainless Steel | 0000000 | 00000 |
| 4 1/2" | 63 | 5/16" | 5/16"-24 | 8 | 8 | 16 | 18-8 Stainless Steel | 0000000 | 00000 |
| 6" | 100 | 5/16" | 5/16"-24 | 8 | 8 | 16 | 18-8 Stainless Steel | 0000000 | 00000 |