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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 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. Cast flanges are also called MSS 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. 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; 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.
Inch Butt-Weld Flanges—Forged
Front
Raised Surface on Back
- For Use With: Air, Water, Oil, Natural Gas
- Pressure Class: 150
- Specifications Met: ASTM A182, 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 | 000000 |
| 1 1/2 | Seamless | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 000000 |
| 2 | Seamless | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 000000 |
| 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 | 00000000 |
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 | 00000000 |
Inch Slip-On Weld Flanges—Forged
Front
Raised Surface on Back
- For Use With: Air, Water, Oil, Natural Gas
- Pressure Class: 150
- Specifications Met: ASTM A182, 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 | 304/304L Stainless Steel | 316/316L Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | Each | ||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 000000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 10 | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 12 | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
Metric Slip-On Weld Flanges—Forged
Front
Raised Surface on Back
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: DIN EN 1092-1
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | DN Flange Size | 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 | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 0000000 |
| 2 | 50 | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
| 6 | 150 | 285 | 20 | 22 | 8 | 240 | 230 psi @ 72° F | 125 psi @ 300° F | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||
| 1 | 25 | 115 | 12 | 14 | 4 | 85 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 2 | 50 | 165 | 16 | 18 | 4 | 125 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 3 | 80 | 200 | 16 | 18 | 8 | 160 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 4 | 100 | 220 | 16 | 18 | 8 | 180 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
| 6 | 150 | 285 | 20 | 22 | 8 | 240 | 230 psi @ 72° F | 145 psi @ 300° F | 0000000 | 000000 |
Slip-On Weld Reducing Flanges—Forged
Front
Raised Surface on Back
- 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 |
| 6 | 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
Slip-On Weld Flanges—Cast
Front
Flat Surface on Back
- For Use With: Air, Water, Natural Gas, Oil
- Pressure Class: 150
- Specifications Met: ASTM A341, MSS SP-51
- Fittings: Use schedule 40 stainless steel
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Bolt Hole | 304 Stainless Steel | 316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | Each | ||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 5/8" | 4 | 3 1/2" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 000000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 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. Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.
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
- Pressure Class: See table
- Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: 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 | ||||||||||
Pressure Class 300 | ||||||||||
| 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 | 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 | 0000000 | 000000 |
| 10 | __ | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 600 psi @ 72° F | 300 psi @ 360° F | 0000000 | 000000 |
Pressure Class 600 | ||||||||||
| 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 | 000000 |
| 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 | ||||||||||
Pressure Class 300 | ||||||||||
| 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 | 00000000 |
Pressure Class 600 | ||||||||||
| 1/2 | 08 | 3 3/4" | 1/2" | 0.62" | 4 | 2 5/8" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 3/4 | 12 | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 1 | 16 | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 1,200 psi @ 72° F | 840 psi @ 400° F | 0000000 | 000000 |
| 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 |
Slip-On Weld Flanges
Front
Raised Surface on Back
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: See table
- Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: 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 | Max. Pressure | Max. Steam Pressure | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Each | |
304/304L Stainless Steel | ||||||||||
Pressure Class 300 | ||||||||||
| 1/2 | 08 | 600 psi @ 72° F | 300 psi @ 360° F | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 00000000 | 000000 |
| 3/4 | 12 | 600 psi @ 72° F | 300 psi @ 360° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 00000000 | 00000 |
| 1 | 16 | 600 psi @ 72° F | 300 psi @ 360° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 00000000 | 00000 |
| 1 1/4 | 20 | 600 psi @ 72° F | 300 psi @ 360° F | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 00000000 | 000000 |
| 1 1/2 | 24 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 00000000 | 000000 |
| 2 | 32 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 00000000 | 000000 |
| 2 1/2 | 40 | 600 psi @ 72° F | 300 psi @ 360° F | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 00000000 | 000000 |
| 3 | 48 | 600 psi @ 72° F | 300 psi @ 360° F | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 00000000 | 000000 |
| 4 | 64 | 600 psi @ 72° F | 300 psi @ 360° F | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 00000000 | 000000 |
| 6 | 96 | 600 psi @ 72° F | 300 psi @ 360° F | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 00000000 | 000000 |
| 8 | __ | 600 psi @ 72° F | 300 psi @ 360° F | 15" | 7/8" | 1" | 12 | 13" | 0000000 | 000000 |
| 10 | __ | 600 psi @ 72° F | 300 psi @ 360° F | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 0000000 | 000000 |
Pressure Class 600 | ||||||||||
| 1/2 | 08 | 1,200 psi @ 72° F | 840 psi @ 400° F | 3 3/4" | 1/2" | 0.62" | 4 | 2 5/8" | 0000000 | 00000 |
| 3/4 | 12 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 0000000 | 00000 |
| 1 | 16 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 0000000 | 00000 |
| 1 1/4 | 20 | 1,200 psi @ 72° F | 840 psi @ 400° F | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 0000000 | 000000 |
| 1 1/2 | 24 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 0000000 | 000000 |
| 2 | 32 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 0000000 | 000000 |
| 2 1/2 | 40 | 1,200 psi @ 72° F | 840 psi @ 400° F | 7 1/2" | 3/4" | 0.88" | 8 | 5 7/8" | 0000000 | 000000 |
| 3 | 48 | 1,200 psi @ 72° F | 840 psi @ 400° F | 8 1/4" | 3/4" | 0.88" | 8 | 6 5/8" | 0000000 | 000000 |
| 4 | 64 | 1,200 psi @ 72° F | 840 psi @ 400° F | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 0000000 | 000000 |
316/316L Stainless Steel | ||||||||||
Pressure Class 300 | ||||||||||
| 1/2 | 08 | 600 psi @ 72° F | 300 psi @ 360° F | 3 3/4" | 1/2" | 0.625" | 4 | 2 5/8" | 00000000 | 00000 |
| 3/4 | 12 | 600 psi @ 72° F | 300 psi @ 360° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 00000000 | 00000 |
| 1 | 16 | 600 psi @ 72° F | 300 psi @ 360° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 00000000 | 00000 |
| 1 1/4 | 20 | 600 psi @ 72° F | 300 psi @ 360° F | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 00000000 | 000000 |
| 1 1/2 | 24 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 00000000 | 000000 |
| 2 | 32 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 00000000 | 000000 |
| 2 1/2 | 40 | 600 psi @ 72° F | 300 psi @ 360° F | 7 1/2" | 3/4" | 0.875" | 8 | 5 7/8" | 00000000 | 000000 |
| 3 | 48 | 600 psi @ 72° F | 300 psi @ 360° F | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 00000000 | 000000 |
| 4 | 64 | 600 psi @ 72° F | 300 psi @ 360° F | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 00000000 | 000000 |
| 6 | 96 | 600 psi @ 72° F | 300 psi @ 360° F | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 00000000 | 000000 |
| 8 | __ | 600 psi @ 72° F | 300 psi @ 360° F | 15" | 7/8" | 1" | 12 | 13" | 00000000 | 000000 |
| 10 | __ | 600 psi @ 72° F | 300 psi @ 360° F | 17 1/2" | 1" | 1.12" | 16 | 15 1/4" | 00000000 | 00000000 |
Pressure Class 600 | ||||||||||
| 1/2 | 08 | 1,200 psi @ 72° F | 840 psi @ 400° F | 3 3/4" | 1/2" | 0.62" | 4 | 2 5/8" | 0000000 | 00000 |
| 3/4 | 12 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 0000000 | 00000 |
| 1 | 16 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 0000000 | 000000 |
| 1 1/4 | 20 | 1,200 psi @ 72° F | 840 psi @ 400° F | 5 1/4" | 5/8" | 0.75" | 4 | 3 7/8" | 0000000 | 000000 |
| 1 1/2 | 24 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/8" | 3/4" | 0.875" | 4 | 4 1/2" | 0000000 | 000000 |
| 2 | 32 | 1,200 psi @ 72° F | 840 psi @ 400° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 0000000 | 000000 |
| 2 1/2 | 40 | 1,200 psi @ 72° F | 840 psi @ 400° F | 7 1/2" | 3/4" | 0.88" | 8 | 5 7/8" | 0000000 | 000000 |
| 3 | 48 | 1,200 psi @ 72° F | 840 psi @ 400° F | 8 1/4" | 3/4" | 0.88" | 8 | 6 5/8" | 0000000 | 000000 |
| 4 | 64 | 1,200 psi @ 72° F | 840 psi @ 400° F | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 0000000 | 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 | High-Vacuum Flange Size | 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" | 0.06" | 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 | 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 |
Gaskets
Gasket
| For Tube OD | For Flange OD | Gasket Material | Specifications Met | Each | |
| 3/4" | 1 21/64" | Copper | ASTM F68 | 0000000 | 00000 |
Bolt Kits
Bolt Kit
| For Flange OD | For High-Vacuum Flange Size | Bolt Dia. | Thread Size | No. of Bolts Included | No. of Nuts Included | No. of Washers Included | Bolt Material | Each | |
| 1 21/64" | 16 | 0.164" | 8-32 | 6 | 6 | 12 | 18-8 Stainless Steel | 0000000 | 00000 |