How to Identify and Measure Fittings
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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).
For technical drawings and 3-D models, click on a part number.
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Fittings with flanged end connect to pumps, valves or gauges that have flanged connections. Also known as conflat, CF, or UHV fittings, they have a higher vacuum rating than quick-clamp fittings, so these adapters allow you to connect between different levels of vacuum within a system. A copper gasket (sold separately) creates a tight seal between the two flanges.
Quick-Clamp Tube Connection | Flanged Tube Connection | Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | Bolt Circle Dia. | Dia. | No. of | For Bolt Dia. | Bolts Included | Max. Vacuum | Max. Pressure | Each | |
| 3/4" | 1.18" | 16 | ISO-KF | 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | 1/4" | No | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | 00000000 | 0000000 |
| 1" | 1.57" | 25 | ISO-KF | 3/4" | 1 21/64" | 16 | CF | 1 1/16" | 11/64" | 6 | 5/32" | No | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 1 1/2" | 2 3/4" | 40 | CF | 2 5/16" | 17/64" | 6 | 1/4" | No | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 2 1/2" | 4 1/2" | 63 | CF | 3 5/8" | 21/64" | 8 | 5/16" | No | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | 5/16" | No | 1 × 10 -9 torr @ 72° F | 5 psi @ 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 | 1 × 10 -7 torr @ 72° F | __ | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
Lever | ||||||||
| 1/2", 3/4" | 1.18" | 10, 16 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | __ | 0000000 | 00000 |
Lever with Lanyard | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 1 × 10 -7 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
- Temperature Range:
Fittings with Fluoroelastomer O-Ring: 0° to 300° F
Fittings with Silicone 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 | |
Fluoroelastomer Rubber O-Ring | ||||||||
|---|---|---|---|---|---|---|---|---|
Rings | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 0000000 | 00000 |
Rings with Stainless Steel Screen | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
Rings with Aluminum Outer Ring | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 100 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 75 psi @ 72° F | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 50 psi @ 72° F | 0000000 | 00000 |
Silicone Rubber O-Ring | ||||||||
Rings | ||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 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 | 1 × 10 -7 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
4 3/16" Lg. | |||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | __ | Flexible | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
12" Lg. | |||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 1 5/8" | Flexible | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
24" Lg. | |||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 1 5/8" | Flexible | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
39" Lg. | |||||||||
| 3/4" | 1.18" | 16 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 1 5/8" | Flexible | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 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.
Ultra-High-Vacuum Hose with Flanges
Often found in semiconductor manufacturing and other demanding industrial applications, this hose handles nearly perfect vacuum. Sharp edges on the flanges dig into a copper gasket (sold separately) as you bolt the flanges together, creating a tighter seal than fittings with a rubber gasket. This allows the hose to maintain the ultra-high vacuum necessary for vacuum coating, heat treating, leak testing, and analyzing gases. The flanges are commonly referred to as ConFlat (CF) and UHV fittings. Thanks to its ribbed interior, this hose is flexible enough to connect misaligned components. That's why it's also called a bellows. The ribbing reduces vibration between components, such as vacuum pumps, valves, and chambers. Both the hose and flanges are made of stainless steel, so they resist rusting.
One of the flanges rotates, so you can easily match up the bolt holes with another flange. Make sure your mating flanges are the same size as these flanges.
Bolt kits are required to make a complete connection.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: -200° to 900° F
- Maximum Vacuum: 10 -13 torr @ 72° F
- Material: 321 Stainless Steel
- Fitting Material: 304 Stainless Steel
Bolt Hole | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | ID | OD | Wall Thickness | Bend Radius | Bolt Circle Dia. | Dia. | No. of | Each | |
Fixed Flange × Rotating Flange | ||||||||||||
4" Lg. | ||||||||||||
| 3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 0000000 | 0000000 |
| 1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
6" Lg. | ||||||||||||
| 2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
| 4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |
12" Lg. | ||||||||||||
| 3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 00000000 | 000000 |
| 1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
| 2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
| 4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |
24" Lg. | ||||||||||||
| 3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 00000000 | 000000 |
| 1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
| 2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
| 4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 000000 |
36" Lg. | ||||||||||||
| 3/4" | 1 21/64" | 16 | CF | 5/8" | 1 1/8" | 0.008" | 1 1/4" | 1 1/16" | 3/16" | 6 | 00000000 | 000000 |
| 1 1/2" | 2 3/4" | 40 | CF | 1 1/2" | 2 3/16" | 0.008" | 2 1/4" | 2 5/16" | 17/64" | 6 | 00000000 | 000000 |
| 2 1/2" | 4 1/2" | 63 | CF | 2 3/8" | 3 1/4" | 0.008" | 4 1/4" | 3 5/8" | 21/64" | 8 | 00000000 | 000000 |
| 4" | 6" | 100 | CF | 3 7/8" | 4 7/8" | 0.008" | 6" | 5 1/8" | 21/64" | 16 | 00000000 | 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 |