How to Identify and Measure Fittings
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Butt-Weld Fittings for Stainless Steel Tubing
- For Use With: See table
- Max. Temperature: 250° F, except hose fittings are unrated.
- 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 | Wall Thick. | For Use With | Each | |
304/304L Stainless Steel  | ||||||
|---|---|---|---|---|---|---|
Dull | ||||||
| 6" | 120 psi @ 72° F | 10 -6 torr @ 72° F | 0.109" | Air, Food, Water | 00000000 | 0000000 |
316/316L Stainless Steel | ||||||
Polished | ||||||
| 6" | 120 psi @ 72° F | 10 -6 torr @ 72° F | 0.109" | Air, Food, Water | 0000000 | 000000 |
Dull | ||||||
| 6" | 120 psi @ 72° F | 10 -6 torr @ 72° F | 0.109" | Air, Food, Water | 00000000 | 000000 |
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
Recessed Nut, Hole for
Lockout, and 2-Pin Hinge
Clamps with wing nut tighten by hand. Clamps with bolt tighten with a wrench. They handle higher pressures than wing-nut clamps for a stronger, more secure hold.
| For Tube OD | For Flange OD | Bolt Material | Max. Pressure | For Tube Specifications Met | Specifications Met | Each | |
304 Stainless Steel with Wing Nut | |||||||
|---|---|---|---|---|---|---|---|
| 6" | 6.57" | __ | 150 psi @ 72 ° F | ASTM A269, ASTM A270 | __ | 00000000 | 000000 |
304 Stainless Steel with Bolt | |||||||
| 6" | 6.57" | 304 Stainless Steel | 300 psi @ 72 ° F | ASTM A269, ASTM A270 | __ | 00000000 | 00000 |
316 Stainless Steel with Wing Nut and 2-Pin Hinge | |||||||
| 6" | 6.57" | __ | 430 psi @ 72 ° F | __ | __ | 0000000 | 00000 |
316 Stainless Steel with Safety Wing Nut and 2-Pin Hinge | |||||||
| 6" | 6.57" | __ | 430 psi @ 72 ° F | __ | __ | 0000000 | 000000 |
316 Stainless Steel with Double Bolt | |||||||
| 6" | 6.57" | 316 Stainless Steel | 210 psi @ 72 ° F | __ | ASME BPVC.VIII | 0000000 | 000000 |
316 Stainless Steel with Recessed Nut, Hole for Lockout, and 2-Pin Hinge | |||||||
| 6" | 6.57" | __ | 430 psi @ 72 ° F | __ | __ | 0000000 | 000000 |
White Nylon Plastic with Wing Nut | |||||||
| 6" | 6.57" | __ | 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 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 6" | 5.820" | 6.510" | 0.203" | -30° to 200° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 000000 |
EPDM Rubber | ||||||||
| 6" | 5.820" | 6.670" | 0.203" | -20° to 300° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 00000 |
Silicone Rubber | ||||||||
| 6" | 5.820" | 6.510" | 0.203" | -40° to 450° | Clear | 3-A Certified 18-03, FDA Compliant 21 CFR 177.1550, FDA Compliant 21 CFR 177.2600 | 0000000 | 00000 |
Fluoroelastomer Rubber | ||||||||
| 6" | 5.820" | 6.510" | 0.203" | -15° to 400° | Black | 3-A Certified 18-03, FDA Compliant 21 CFR 177.2600 | 0000000 | 00000 |
PTFE Plastic | ||||||||
| 6" | 5.820" | 6.510" | 0.203" | -100° to 500° | White | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550 | 00000000 | 00000 |
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 | |
| 6" | 7.09" | 160 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 0000000 |
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 | |
| 6" | 7.09" | 160 | 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 | |||||||
| 6" | 7.09" | 160 | 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 | |||||||
| 6" | 7.09" | 160 | 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 | |
| 6" | 8.86" | 160 | ISO-F | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 000000 |