How to Identify and Measure Fittings
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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
Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides. Stub-end flanges are also known as lap-joint flanges; use them with a stub-end straight adapter (not included). The stub-end straight adapter slides into the flange and welds to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily for frequent cleaning and inspecting. Cap flanges are also known as blind flanges.
Forged flanges have better strength than cast flanges. Cast flanges are also called MSS flanges.
304 stainless steel flanges offer very good corrosion resistance, and 316 stainless steel flanges have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- 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
Flanges | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Bolt Hole | Thin-Wall Straight Adapters | Standard-Wall Straight Adapters | ||||||||||
| Pipe Size  | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Each | Each | Each | |||
304/304L Stainless Steel | ||||||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 000000 | 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 | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 | 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 | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 00000 | 000000000 | 00000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 00000 | 000000000 | 00000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
| 10 | 16" | 7/8" | 1" | 12 | 14 1/4" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
| 12 | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
316/316L Stainless Steel | ||||||||||||
| 1/2 | 3 1/2" | 1/2" | 5/8" | 4 | 2 3/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 3/4 | 3 7/8" | 1/2" | 5/8" | 4 | 2 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 5/8" | 4 | 3 1/8" | 230 psi @ 72° F | 000000000 | 00000 | 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 | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 5/8" | 4 | 3 7/8" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 00000 | 000000000 | 00000 | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 3/4" | 4 | 5 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 00000 | 000000000 | 00000 |
| 3 | 7 1/2" | 5/8" | 3/4" | 4 | 6" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 00000 | 000000000 | 00000 |
| 4 | 9" | 5/8" | 3/4" | 8 | 7 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 00000 | 000000000 | 00000 |
| 6 | 11" | 3/4" | 7/8" | 8 | 9 1/2" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
| 8 | 13 1/2" | 3/4" | 7/8" | 8 | 11 3/4" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000000 | 000000 |
| 12 | 19" | 7/8" | 1" | 12 | 17" | 230 psi @ 72° F | 000000000 | 000000 | 000000000 | 000000 | 000000 | 00 |
- For Use With: Air, Water, Natural Gas, Oil
- Pressure Class: 150
- Specifications Met: MSS SP-51, ASTM A351
- 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 | 000000 |
| 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 |
- For Use With: Air, Water, Natural Gas, Oil
- Pressure Class: 150
- Specifications Met: MSS SP-42, ASTM A351
- 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 | 000000 |
| 2 | 6" | 5/8" | 3/4" | 4 | 4 3/4" | 230 psi @ 72° F | 000000000 | 000000 | 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.
Stub-end flanges are also known as lap-joint flanges; use them with a stub-end straight adapter (not included). The stub-end straight adapter slides into the flange and welds to pipe (not the flange). Since the flange isn’t welded to the pipe, it can be disconnected easily for frequent cleaning and inspecting.
For technical drawings and 3-D models, click on a part number.
- 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
Flanges | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Bolt Hole | Straight Adapters | |||||||||||
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Each | Each | ||
304/304L Stainless Steel | ||||||||||||
Pressure Class 300 | ||||||||||||
| 3/4 | 12 | 600 psi @ 72° F | 300 psi @ 360° F | 4 5/8" | 5/8" | 0.75" | 4 | 3 1/4" | 00000000 | 000000 | 000000000 | 000000 |
| 1 | 16 | 600 psi @ 72° F | 300 psi @ 360° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 00000000 | 00000 | 000000000 | 00000 |
| 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 | 000000000 | 00000 |
| 2 | 32 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 00000000 | 000000 | 000000000 | 00000 |
| 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 | 000000000 | 00000 |
| 3 | 48 | 600 psi @ 72° F | 300 psi @ 360° F | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 00000000 | 000000 | 000000000 | 00000 |
| 4 | 64 | 600 psi @ 72° F | 300 psi @ 360° F | 10" | 3/4" | 0.875" | 8 | 7 7/8" | 00000000 | 000000 | 000000000 | 00000 |
| 6 | 96 | 600 psi @ 72° F | 300 psi @ 360° F | 12 1/2" | 3/4" | 0.875" | 12 | 10 5/8" | 00000000 | 000000 | 000000000 | 000000 |
Pressure Class 600 | ||||||||||||
| 1 | 16 | 1,200 psi @ 72° F | 840 psi @ 400° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 0000000 | 00000 | 000000000 | 00000 |
| 4 | 64 | 1,200 psi @ 72° F | 840 psi @ 400° F | 10 3/4" | 7/8" | 1" | 8 | 8 1/2" | 0000000 | 000000 | 000000000 | 00000 |
316/316L Stainless Steel | ||||||||||||
Pressure Class 300 | ||||||||||||
| 1 | 16 | 600 psi @ 72° F | 300 psi @ 360° F | 4 7/8" | 5/8" | 0.75" | 4 | 3 1/2" | 00000000 | 00000 | 000000000 | 00000 |
| 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 | 000000000 | 00000 |
| 2 | 32 | 600 psi @ 72° F | 300 psi @ 360° F | 6 1/2" | 5/8" | 0.75" | 8 | 5" | 00000000 | 000000 | 000000000 | 00000 |
| 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 | 000000000 | 00000 |
| 3 | 48 | 600 psi @ 72° F | 300 psi @ 360° F | 8 1/4" | 3/4" | 0.875" | 8 | 6 5/8" | 00000000 | 000000 | 000000000 | 00000 |
High-Pressure Stainless Steel Unthreaded SAE Pipe Flanges
Create an access point in a high-pressure hydraulic fluid line with these flanges. They are also known as Code 61 SAE hydraulic flanges. To connect, bolt a flange with an O-ring groove surface to a flange with a flat surface of the same size. Flanges are 316 stainless steel for excellent corrosion resistance.
Socket-connect flanges weld to pipe for a strong, permanent connection. Cap flanges are also known as blind flanges.
For technical drawings and 3-D models, click on a part number.
- For Use With: Hydraulic Fluid
- Specifications Met: SAE J518, ISO 6162
Flange | Bolt Hole | 316/316L Stainless Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | SAE Flange Size | Dash Size | Max. Pressure | Ht. | Wd. | Dp. | Mounting Hardware Included | For Bolt Dia. | Dia. | No. of | Ctr.-to-Ctr. | Each | |
| 3/4 | 3/4 | 12 | 5,000 psi @ 72° F | 2 5/8" | 1 3/4" | 15/16" | No | 3/8" | 0.406" | 4 | 7/8", 1 7/8" | 0000000 | 0000000 |
| 1 | 1 | 16 | 5,000 psi @ 72° F | 2 53/64" | 2" | 15/16" | No | 3/8" | 0.406" | 4 | 1.031", 2.062" | 00000000 | 000000 |
| 1 1/2 | 1 1/2 | 24 | 3,000 psi @ 72° F | 3 3/4" | 2 3/4" | 1 3/16" | No | 1/2" | 0.531" | 4 | 1.406", 2 3/4" | 00000000 | 000000 |
| 2 | 2 | 32 | 3,000 psi @ 72° F | 4" | 3 1/4" | 1 7/16" | No | 1/2" | 0.531" | 4 | 1.688", 3.062" | 00000000 | 000000 |
- For Use With: Hydraulic Fluid
- Specifications Met: SAE J518, ISO 6162
Flange | Bolt Hole | 316/316L Stainless Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SAE Flange Size | Dash Size | Max. Pressure | Ht. | Wd. | Dp. | Mounting Hardware Included | For Bolt Dia. | Dia. | No. of | Ctr.-to-Ctr. | Each | |
| 2 | 32 | 3,000 psi @ 72° F | 4" | 3 1/4" | 1 45/64" | No | 1/2" | 0.531" | 4 | 1.688", 3.063" | 00000000 | 0000000 |
Low-Pressure Stainless Steel Threaded Pipe Flanges
Also known as Pressure Class 150 flanges, these are designed for low-pressure pipe 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 within a line.
304 stainless steel flanges have very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance. Cast flanges are also called MSS flanges.
For technical drawings and 3-D models, click on a part number.
- For Use With: Natural Gas, Steam, Oil, Water, Air
- Pressure Class: 150
- Specifications Met: MSS SP-51, ASTM A351, MSS SP-42
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Fittings: Use Class 150 stainless steel
Bolt Hole | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
304 Stainless Steel | |||||||||
NPT | |||||||||
| 1/2 | 3 1/2" | 1/2" | 0.625" | 4 | 2 3/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3/4 | 3 7/8" | 1/2" | 0.625" | 4 | 2 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 0.625" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 0.625" | 4 | 3 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 0.625" | 4 | 3 7/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 2 | 6" | 5/8" | 0.75" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 2 1/2 | 7" | 5/8" | 0.75" | 4 | 5 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 0.75" | 4 | 6" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 4 | 9" | 5/8" | 0.75" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
316 Stainless Steel | |||||||||
NPT | |||||||||
| 1/2 | 3 1/2" | 1/2" | 0.625" | 4 | 2 3/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 3/4 | 3 7/8" | 1/2" | 0.625" | 4 | 2 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 1 | 4 1/4" | 1/2" | 0.625" | 4 | 3 1/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 1 1/4 | 4 5/8" | 1/2" | 0.625" | 4 | 3 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 00000 |
| 1 1/2 | 5" | 1/2" | 0.625" | 4 | 3 7/8" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 | 6" | 5/8" | 0.75" | 4 | 4 3/4" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 2 1/2 | 7" | 5/8" | 0.75" | 4 | 5 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 3 | 7 1/2" | 5/8" | 0.75" | 4 | 6" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
| 4 | 9" | 5/8" | 0.75" | 8 | 7 1/2" | 230 psi @ 72° F | 150 psi @ 360° F | 000000000 | 000000 |
High-Pressure Stainless Steel Threaded SAE Pipe Flanges
Also known as Code 61 SAE hydraulic flanges, these let you create an access point in a high-pressure hydraulic line. To connect, bolt flanges to equipment, or bolt a flange with an O-ring groove surface to a flange with a flat surface of the same size. Flanges are 316 stainless steel for excellent corrosion resistance.
NPTF (Dryseal) threads are compatible with NPT threads. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
- Specifications Met: SAE J518, ISO 6162
- For Use With: Hydraulic Fluid
Flange | Bolt Hole | 316/316L Stainless Steel | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Size | SAE Flange Size | Dash Size | Max. Pressure | Ht. | Wd. | Dp. | Mounting Hardware Included | For Bolt Dia. | Dia. | No. of | Ctr.-to-Ctr. | Each | |
NPTF | ||||||||||||||
| 1 | __ | 1 | 16 | 2,000 psi @ 72° F | 2 53/64" | 2" | 1 29/64" | No | 3/8" | 0.312" | 4 | 1.031", 2.062" | 0000000 | 0000000 |
| 1 1/2 | __ | 1 1/2 | 24 | 1,000 psi @ 72° F | 3 3/4" | 2 3/4" | 1 45/64" | No | 1/2" | 0.422" | 4 | 1.406", 2.75" | 0000000 | 000000 |
| 2 | __ | 2 | 32 | 1,000 psi @ 72° F | 4" | 3 1/4" | 1 45/64" | No | 1/2" | 0.422" | 4 | 1.688", 3.062" | 0000000 | 000000 |
UN/UNF (SAE Straight) | ||||||||||||||
| __ | 2 1/2"-12 | 2 | 32 | 3,000 psi @ 72° F | 4" | 3 1/4" | 1 45/64" | No | 1/2" | 0.531" | 4 | 1.688", 3.062" | 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.
Socket-connect flanges are easier to weld than butt-weld flanges because they don’t need to align perfectly to tubing; insert the tubing into the socket end and weld together.
Caps are also known as blind flanges.
Bolt kits are required to make a complete connection.
For technical drawings and 3-D models, click on a part number.
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" | 0.049" | 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 |
Socket-Connect Tube Connection | Flanged Tube Connection | Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Socket Dp. | 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" | 7/64" | 3/4" | 1 21/64" | 16 | CF | 11/16" | 3/16" | 6 | No | 1 | 5/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 1 1/2" | 13/64" | 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | No | 1 | 1/2" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 2 1/2" | 3/8" | 2 1/2" | 4 1/2" | 63 | CF | 3 5/8" | 21/64" | 8 | No | 1 | 11/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 4" | 7/16" | 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 2 | 25/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
Rotating | ||||||||||||||||
| 3/4" | 1/8" | 3/4" | 1 21/64" | 16 | CF | 11/16" | 3/16" | 6 | No | 1 | 5/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 1 1/2" | 13/64" | 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | No | 1 | 1/2" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 2 1/2" | 3/8" | 2 1/2" | 4 1/2" | 63 | CF | 3 5/8" | 21/64" | 8 | No | 1 | 11/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 4" | 7/16" | 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 2 | 25/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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" | 1 21/64" | 16 | CF | 1 1/16" | 11/64" | 6 | No | 1 | 5/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | No | 1 | 1/2" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 2 1/2" | 4 1/2" | 63 | CF | 3 5/8" | 21/64" | 8 | No | 1 | 11/16" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 00000 |
| 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 2 | 25/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 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 |
| 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 | 16 | 16 | 32 | 18-8 Stainless Steel | 0000000 | 00000 |