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Maximum Pressure Maximum Pressure |
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Flange OD Flange OD |
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For Pipe Material For Pipe Material |
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Bolt Circle Diameter Bolt Circle Diameter |
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Maximum Steam Pressure Maximum Steam Pressure |
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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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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 | 150 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" | 300 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" | 300 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" | 300 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" | 300 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" | 300 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" | 300 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" | 300 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" | 300 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" | 300 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 00000 |
| 5 | __ | 0.375" | 11" | 3/4" | 7/8" | 8 | 9 1/4" | 300 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" | 300 psi @ 72° F | 300 psi @ 300° F | Black-Coated Steel | 00000000 | 000000 |
| 8 | __ | 0.5" | 15" | 7/8" | 1" | 12 | 13" | 300 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" | 300 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" | 300 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" | 150 psi @ 72° F | 000000000 | 000000 |
| 3/4 | Seamless | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 | Seamless | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | Seamless | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 150 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | Seamless | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 150 psi @ 72° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 6 | Seamless | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 8 | Seamless | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 150 psi @ 72° F | 000000000 | 000000 |
| 10 | Seamless | 16" | 7/8" | 1" | 12 | 14 1/4" | 150 psi @ 72° F | 000000000 | 000000 |
| 12 | Seamless | 19" | 7/8" | 1" | 12 | 17" | 150 psi @ 72° F | 000000000 | 000000 |
316/316L Stainless Steel | |||||||||
| 1/2 | Seamless | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 3/4 | Seamless | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 | Seamless | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/4 | Seamless | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 150 psi @ 72° F | 000000000 | 00000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 150 psi @ 72° F | 000000000 | 00000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 150 psi @ 72° F | 000000000 | 00000 |
| 2 1/2 | Seamless | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 3 | Seamless | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 150 psi @ 72° F | 000000000 | 000000 |
| 4 | Seamless | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 6 | Seamless | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 150 psi @ 72° F | 000000000 | 000000 |
| 8 | Seamless | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 150 psi @ 72° F | 000000000 | 000000 |
| 10 | Seamless | 16" | 7/8" | 1" | 12 | 14 1/4" | 150 psi @ 72° F | 000000000 | 000000 |
| 12 | Seamless | 19" | 7/8" | 1" | 12 | 17" | 150 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" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 4 | 64 | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 6 | 96 | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 8 | __ | 15" | 7/8" | 1" | 12 | 13" | 300 psi @ 72° F | 300 psi @ 360° F | 0000000 | 000000 |
| 10 | __ | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 300 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" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | 20 | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 1 1/2 | 24 | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 2 | 32 | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 2 1/2 | 40 | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 3 | 48 | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 4 | 64 | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 6 | 96 | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 8 | __ | 15" | 7/8" | 1" | 12 | 13" | 300 psi @ 72° F | 300 psi @ 360° F | 00000000 | 000000 |
| 10 | __ | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 300 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 |