How to Identify and Measure Fittings
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Butt-Weld Fittings for Stainless Steel Tubing
- For Use With: See table
- Temperature Range: See table
- Tubing:
304 Stainless Steel: Use with 304/304L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except DIN EN 10357 fittings with only ASTM A269 or ASTM A270
316 Stainless Steel: Use with 316/316L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except ASME BPE and DIN EN 10357 fittings with only ASTM A269 or ASTM A270 - Specifications Met: See table
Weld these fittings to tubing for a permanent, flush connection that permits smooth flow through a line.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Max. Pressure | Max. Vacuum | Temp. Range Min., °F | Temp. Range Max., °F | Wall Thick. | For Use With | Each | |
304/304L Stainless Steel  | ||||||||
|---|---|---|---|---|---|---|---|---|
Polished | ||||||||
| 4" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.083" | Air, Food, Water | 00000000 | 0000000 |
Dull | ||||||||
| 4" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.083" | Air, Food, Water | 00000000 | 00000 |
316/316L Stainless Steel | ||||||||
Polished | ||||||||
| 4" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.083" | Air, Food, Water | 0000000 | 00000 |
Dull | ||||||||
| 4" | 250 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.083" | Air, Food, Water | 00000000 | 00000 |
High-Polish Metal Quick-Clamp Sanitary Tube Fittings
- Temperature Range: See Gaskets
The smooth finish inside these fittings makes it easy to remove product residue. Also known as aseptic and tri-clamp fittings, they connect with a gasket, a clamp, and another quick-clamp fitting for a fast and easy way to access your line. The pressure rating of the fitting will vary depending on the clamp you choose, and the temperature rating will vary based on the gasket material you choose.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
3-A certified fittings comply with sanitary standards.
Note: To complete a connection, you’ll need two quick-clamp fittings, a clamp, and a gasket (all sold separately).
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Beverage, Dairy, Food, Water
- Tubing: Use with welded 304/304L or 316/316L stainless steel that meets ASTM A269 or ASTM 270
- Specifications Met: 3-A Certified 63-04
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 200 psi @ 72° F | ASTM A269, ASTM A270 | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 200 psi @ 72° F | ASTM A269, ASTM A270 | 0000000 | 000000 |
| For Tube OD | For Flange OD | Bolt Material | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 304 Stainless Steel | 1,000 psi @ 72° F | ASTM A269, ASTM A270 | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Specifications Met | Each | |
| 4" | 4.82" | 300 psi @ 72° F | ASTM A269, ASTM A270 | ASME BPE | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | Each | |
| 4" | 4.682" | 500 psi @ 72° F | 0000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | Each | |
| 4" | 4.682" | 500 psi @ 72° F | 0000000 | 000000 |
| For Tube OD | For Flange OD | Bolt Material | Max. Pressure | Specifications Met | Each | |
| 4" | 4.682" | 316 Stainless Steel | 820 psi @ 72° F | ASME BPVC.VIII | 0000000 | 0000000 |
| For Tube OD | For Flange OD | Max. Pressure | Each | |
| 4" | 4.682" | 500 psi @ 72° F | 0000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 150 psi @ 72° F | ASTM A269, ASTM A270 | 00000000 | 000000 |
Buna-N gaskets are oil resistant. EPDM gaskets resist water and steam and work well in humid environments. Silicone gaskets withstand high temperatures. Fluoroelastomer gaskets stand up to fuel, oil, and acid condensates. PTFE gaskets withstand harsh chemicals, with the exception of molten alkali metal and elemental fluorine.
| For Tube OD | ID | OD | Thick. | Temp. Range, °F | Color | Specifications Met | Each | |
Buna-N Rubber | ||||||||
|---|---|---|---|---|---|---|---|---|
| 4" | 3.870" | 4.680" | 0.203" | -30° to 200° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 00000 |
EPDM Rubber | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -20° to 300° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 0000 |
Silicone Rubber | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -40° to 450° | Clear | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 0000 |
Fluoroelastomer Rubber | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -15° to 400° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.2600 | 0000000 | 0000 |
PTFE Plastic | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -100° to 500° | White | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550 | 00000000 | 0000 |
Extra-High-Polish Metal Quick-Clamp Sanitary Tube Fittings
- For Use With: Air, Beverage, Dairy, Deionized Water, Food, Pharmaceuticals, Water
- Temperature Range: See Gaskets
- Tubing:
Fittings with 700 psi @ 72° F max. pressure: Use with 316/316L stainless steel that meets ASTM A269 or ASTM A270
Fittings with all other max. pressures: Use with 316/316L stainless steel that meets ASTM A249, ASTM A269, or ASTM A270
Gaskets: Use with 304/304L and 316/316L stainless steel - Specifications Met: See table
- Certification: Material Certificate with Traceable Lot Number and Test Report
Polished to a 20 Ra finish, these fittings have an extra-smooth interior that prevents product buildup and inhibits bacteria growth. Use them in pharmaceutical and bioprocessing applications. Also known as tri-clamp fittings, they connect with a clamp, a gasket, and another quick-clamp fitting for a fast and easy way to access your line. Fittings are 316 stainless steel for excellent corrosion resistance.
The pressure rating of the fitting will depend on the clamp you choose.
The temperature rating of the fitting will vary depending on the gasket material you choose.
Note: To complete a connection, you’ll need two quick-clamp fittings, a clamp, and a gasket (all sold separately).
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Flange OD | Length | Material | Max. Pressure | Specifications Met | Each | |
| 4" | 4.682" | 5/16" | 316/316L Stainless Steel | 200 psi @ 72° F | ASME BPE | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 200 psi @ 72° F | ASTM A269, ASTM A270 | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 200 psi @ 72° F | ASTM A269, ASTM A270 | 0000000 | 000000 |
| For Tube OD | For Flange OD | Bolt Material | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 304 Stainless Steel | 1,000 psi @ 72° F | ASTM A269, ASTM A270 | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Specifications Met | Each | |
| 4" | 4.682" | 300 psi @ 72° F | ASTM A269, ASTM A270 | ASME BPE | 00000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | Each | |
| 4" | 4.682" | 500 psi @ 72° F | 0000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | Each | |
| 4" | 4.682" | 500 psi @ 72° F | 0000000 | 000000 |
| For Tube OD | For Flange OD | Bolt Material | Max. Pressure | Specifications Met | Each | |
| 4" | 4.682" | 316 Stainless Steel | 820 psi @ 72° F | ASME BPVC.VIII | 0000000 | 0000000 |
| For Tube OD | For Flange OD | Max. Pressure | Each | |
| 4" | 4.682" | 500 psi @ 72° F | 0000000 | 000000 |
| For Tube OD | For Flange OD | Max. Pressure | For Tube Specifications Met | Each | |
| 4" | 4.682" | 150 psi @ 72° F | ASTM A269, ASTM A270 | 00000000 | 000000 |
| For Tube OD | ID | OD | Thick. | Temp. Range, °F | Color | Specifications Met | Each | |
Buna-N Rubber | ||||||||
|---|---|---|---|---|---|---|---|---|
| 4" | 3.870" | 4.680" | 0.203" | -30° to 200° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 00000 |
EPDM Rubber | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -20° to 300° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 0000 |
Silicone Rubber | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -40° to 450° | Clear | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 0000 |
Fluoroelastomer Rubber | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -15° to 400° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.2600 | 0000000 | 0000 |
PTFE Plastic | ||||||||
| 4" | 3.870" | 4.680" | 0.203" | -100° to 500° | White | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550 | 00000000 | 0000 |
High-Polish Gasket Fittings for Stainless Steel Tubing
- For Use With: Air, Dairy, Water
- Temperature Range: See Gaskets
- Tubing:
Inch Butt-Weld Fittings and Quick-Clamp Fittings: Use with welded 304/304L or 316/316L stainless steel that meets ASTM 269 or ASTM 27
Metric Butt-Weld Fittings: Use with welded or seamless 316 stainless steel - Specifications Met:
304 Stainless Steel Adapters, Caps, and Nuts: 3-A Certified 63-04
Gaskets: See table
Join these fittings with a threaded nut and a gasket for a secure connection that grants you easy access to your line. Also known as bevel seat fittings, the fittings are beveled to fit snugly around the gasket, creating a vibration-resistant seal. Fittings are polished to a smooth finish on the interior to prevent product buildup and bacterial growth.
304 stainless steel fittings have very good corrosion resistance. They’re 3-A certified to meet sanitary design standards.
Note: For a complete connection, you’ll need a threaded straight adapter, an unthreaded straight adapter, a gasket, and a nut (all sold separately unless noted).
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Material | Max. Pressure | Each | |
| 4" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 000000 |
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 4" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 000000 |
| For Tube OD | ID | OD | Thick. | Temp. Range, °F | Color | Specifications Met | Each | |
Buna-N Rubber | ||||||||
|---|---|---|---|---|---|---|---|---|
| 4" | 3.700" | 4 1/2" | 0.45" | -30° to 200° | Black | __ | 0000000 | 00000 |
PTFE Plastic | ||||||||
| 4" | 3.700" | 4 1/2" | 0.33" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
316 Stainless Steel/PTFE Plastic Blend | ||||||||
| 4" | 3.700" | 4 1/2" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
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.
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.
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 | ||||||||||||||
| 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 | 0000000 |
| For Tube OD | For Flange OD | Gasket Material | Specifications Met | Each | |
| 4" | 6" | Copper | ASTM F68 | 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 | |
| 6" | 100 | 5/16" | 5/16"-24 | 16 | 16 | 32 | 18-8 Stainless Steel | 0000000 | 000000 |
Claw-Clamp High-Vacuum Fittings for Stainless Steel Tubing
An alternative to bolt-together fittings, these handle larger tube OD sizes and have higher vacuum ratings than quick-clamp fittings. Also known as ISO-K high-vacuum fittings, the clamps have claws that grab hold of fittings with flanged ends. To complete a connection, use a ring and four clamps (sold separately). Not for use in pressure applications.
Double-claw clamps attach to the grooves on the fittings.
Single-claw clamps have a clamp on one end and an exposed bolt on the other. Thread the bolt-end directly into the body of pumps, valves, or other high-vacuum components.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | No. of Claw Clamps Required | Material | Max. Vacuum | Each | |
| 4" | 5.12" | 100 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
Material | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | O-Ring | Inner Ring | Max. Vacuum | Max. Temp., °F | Each | |
| 4" | 5.12" | 100 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 000000 |
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Bolt Material | Max. Vacuum | Each | |
Double Claw | |||||||
|---|---|---|---|---|---|---|---|
Aluminum | |||||||
| 2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | 18-8 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
316 Stainless Steel | |||||||
| 2 1/2", 3", 4", 6", 8", 10" | 3.74", 4.33", 5.12", 7.09", 9.45", 11.42" | 63, 80, 100, 160, 200, 250 | ISO-K | 316 Stainless Steel | 1 × 10 -8 torr @ 72° F | 00000000 | 00000 |
Single Claw | |||||||
Aluminum | |||||||
| 2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | 18-8 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
Bolt-Together High-Vacuum Fittings for Stainless Steel Tubing
For high-vacuum systems with tube sizes too large for quick-clamp (KF) fittings, choose these bolt-together fittings. Also known as ISO-F flanges, these fittings work with tube sizes starting at 2 1/2" OD and are rated for higher levels of vacuum than quick-clamp fittings. Not for use in pressure applications.
To complete the bolt-end connection, you'll need a ring and a bolt kit (both sold separately).
For technical drawings and 3-D models, click on a part number.
Flanged Connection | Material | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | O-Ring | Inner Ring | Max. Vacuum | Max. Temp., °F | Each | |
| 4" | 6.5" | 100 | ISO-F | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 000000 |