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.
More
Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing
- For Use With:
Fittings with Gasket End: Air, Argon, Helium, Nitrogen
All Other Fittings: Air - Specifications Met: ISO 2861
Instead of a gasket, these fittings have a metal-reinforced O-ring that is designed for high-vacuum applications, such as vacuum coating and heat treating, leak testing, and analyzing gases. Also known as KF, QF, and NW fittings, they are the most common type of connection in high-vacuum systems. Connect with a clamp and another quick-clamp fitting for fast, easy access to your line. To use fittings in pressure applications, use a pressure-rated ring (sold separately). Made of 304 stainless steel, these fittings have very good corrosion resistance.
Note: To complete a connection, you’ll need two quick-clamp fittings, a ring, and a clamp (all sold separately).
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L or 316/316L stainless steel
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Each | |
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 0000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 0000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 0000000 | 000000 |
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Inline tees are also known as branch tees.
Tube Connection (A) | Tube Connection (B) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Each | |
| 1" | 1.57" | 25 | ISO-KF | 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 0000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
Clamps tighten by hand.
Lever clamps are also known as toggle clamps.
Clamps with lanyard let you secure the clamp to equipment.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Lanyard Lg. | Each | |
Wing Nut | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/2", 3/4" | 1.18" | 10, 16 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
Lever | ||||||||
| 1/2", 3/4" | 1.18" | 10, 16 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
Lever with Lanyard | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
- Temperature Range:
Fittings with Viton® Fluoroelastomer Rubber O-Ring: 0° to 300° F
Fittings with Silicone Rubber O-Ring: -50° to 390°F - Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
Use these rings with quick-clamp high-vacuum fittings. They consist of a stainless steel inner ring covered by an O-ring.
Silicone rings withstand higher temperatures than fluoroelastomer ones.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Inner Ring Material | Max. Vacuum | Max. Pressure | Each | |
Viton® Fluoroelastomer Rubber O-Ring | ||||||||
|---|---|---|---|---|---|---|---|---|
Rings | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 0000000 | 00000 |
Rings with Stainless Steel Screen | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
Rings with Aluminum Outer Ring | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 100 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 75 psi @ 72° F | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 50 psi @ 72° F | 0000000 | 00000 |
Silicone Rubber O-Ring | ||||||||
Rings | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
Hose absorbs moderate vibration
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Bend Radius | Flexibility | Each | |
3 3/16" Lg. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
4 3/16" Lg. | |||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
12" Lg. | |||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 5/8" | Flexible | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
24" Lg. | |||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 5/8" | Flexible | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
39" Lg. | |||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 5/8" | Flexible | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
- Temperature Range: 0° to 190° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Valves are also known as vacuum isolation valves. They connect to a vacuum system so you can install gauges, release gases, and remove air. They operate manually and have a compact body that fits easily into tight spaces.
| Actuation | For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Max. Vacuum | Body Material | Overall Ht. | Overall Lg. | Each | |
| Manual | 3/4" | 1 3/16" | 16 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 4 1/8" | 2 1/4" | 00000000 | 0000000 |
| Manual | 1" | 1 9/16" | 25 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 5 5/8" | 3" | 00000000 | 000000 |
| Manual | 1 1/2" | 2 1/8" | 40 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 6 3/8" | 3 7/8" | 00000000 | 000000 |
| Manual | 2" | 2 15/16" | 50 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 8" | 4 1/2" | 00000000 | 000000 |
Flanged Ultra-High-Vacuum 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.
Bolt kits are required to make a complete connection.
Bolt Holes | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | Max. Vacuum | Material | Appearance | Each | |
Fixed × Rotating × Rotating | |||||||||||||
| 3/4" | 1 21/64" | 16 | CF | 1 1/16" | 11/64" | 6 | No | 3 | 10 -13 torr @ 72° F | 304 Stainless Steel | Polished | 0000000 | 0000000 |
| 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | No | 3 | 10 -13 torr @ 72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 2 1/2" | 4 1/2" | 63 | CF | 3 5/8" | 21/64" | 8 | No | 3 | 10 -13 torr @ 72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
| 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 6 | 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 |