System of Measurement System of Measurement |
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Connection Style Connection Style | Show |
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| Yor-Lok |
Connection Style Connection Style | Hide |
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| Threaded |
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| Barbed |
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| Without Fittings |
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| Quick Disconnect |
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| Push to Connect |
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| Compression |
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| Claw |
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| Flared |
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| Socket Connect |
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| Flanged |
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| Quick Clamp |
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| Claw Clamp |
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| Gasket |
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| Butt Weld |
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| Yor-Lok |
Type Type |
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 | Adapter |
Shape Shape |
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 | Straight |
High Vacuum Connection Type High VacuumConnection Type |
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Connection Type Connection Type |
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 | Tube |
Material Material |
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For Tube Material For Tube Material |
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Compatible With Compatible With |
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Maximum Vacuum Maximum Vacuum |
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Maximum Temperature Maximum Temperature |
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Minimum Temperature Minimum Temperature |
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Nut Material Nut Material |
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Gender Gender |
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 | Female |
Specifications Met Specifications Met |
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Sterilize With Sterilize With |
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Maximum Pressure Maximum Pressure |
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Vacuum Rating Vacuum Rating |
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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.
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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 - Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L or 316/316L stainless steel
- Specifications Met: ISO 2861
Instead of a gasket, these fittings have a special 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).
304 stainless steel 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.
Fittings with Yor-Lok end connect plain-end stainless steel tubing using a nut with two sleeves that bite into the tubing to create a strong seal. Yor-Lok connections are manufactured to tight tolerances—use them for high-pressure applications such as supplying gas or liquid to a high-vacuum chamber. Also known as instrumentation fittings.
Quick-Clamp Tube Connection | |||||||||
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| For Tube OD | Flange OD | Trade Number | High Vacuum Connection Type | For Tube OD (Yor-Lok) | Max. Vacuum | Max. Pressure | Compatible With | Each | |
| 3/4" | 1.18" | 16 | ISO-KF | 1/4" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 000000 |
| 3/4" | 1.18" | 16 | ISO-KF | 3/8" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 00000 |
| 3/4" | 1.18" | 16 | ISO-KF | 1/2" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 000000 |
| 1" | 1.57" | 25 | ISO-KF | 1/4" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 3/8" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 00000 |
| 1" | 1.57" | 25 | ISO-KF | 1/2" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 1/4" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 3/8" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 1/2" | 1 × 10 -9 torr @ 72° F | 5 psi @ 72° F | Let-Lok, Parker A-Lok, Swagelok® | 00000000 | 000000 |
Clamps (sold separately) tighten by hand. Spring-loaded clamps are also known as toggle clamps.
| For Tube OD | For Flange OD | Trade Number | High Vacuum Connection Type | Material | Max. Vacuum | Lanyard Length | Each | |
with 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 |
Spring Loaded | ||||||||
| 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 |
Spring Loaded 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 |
Rings (sold separately) consist of a stainless steel inner ring covered by a fluoroelastomer O-ring. Rings with screen have a stainless steel screen to filter out large particles. Pressure-rated rings have an aluminum outer ring to withstand extra pressure.
| For Tube OD | For Flange OD | Trade Number | High Vacuum Connection Type | Inner Ring Material | Max. Vacuum | Max. Pressure | Each | |
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 | 0000 |
| 1 1/2" | 2.16" | 40 | 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 |
Rings with Aluminum Outer Ring | ||||||||
| 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 |
Hose (sold separately) absorbs moderate vibration
| For Tube OD | Flange OD | Trade Number | 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 | __ | Rigid | 0000000 | 000000 |
4 3/16" Lg. | |||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | __ | Rigid | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 1 × 10 -7 torr @ 72° F | __ | Rigid | 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 |
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 |
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 |