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Connection Style Connection Style | Show |
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Claw Clamp |
Connection Style Connection Style | Hide |
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System of Measurement System of Measurement |
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Connection Type Connection Type |
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![]() | Tube |
High Vacuum Connection Type High Vacuum Connection Type |
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Maximum Vacuum @ Temperature Maximum Vacuum@ Temperature |
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Fitting Material Fitting Material |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Minimum Temperature Minimum Temperature |
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Maximum Temperature Maximum Temperature |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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Vacuum Rating Vacuum Rating |
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Maximum Pressure @ Temperature Maximum Pressure@ Temperature |
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For Use With For Use With |
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For Use Outdoors For Use Outdoors |
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About Hose
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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.
Caps

Cap
For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | No. of Claw Clamps Required | Material | Max. Vacuum | Each | |
2 1/2" | 3.74" | 63 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
4" | 5.12" | 100 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
Rings

Ring
Material | |||||||||
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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 | |
2 1/2" | 3.74" | 63 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 000000 |
3" | 4.33" | 80 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 000000 | 00000 |
4" | 5.12" | 100 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 00000 |
Clamps

Double-Claw Clamp

Single-Claw Clamp
For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Bolt Material | Max. Vacuum | Each | |
Double Claw | ||||||||
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2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | Aluminum | 18-8 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | Aluminum | 18-8 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
Single Claw | ||||||||
2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | Aluminum | 18-8 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
6" | 7.09" | 160 | ISO-K | Aluminum | 18-8 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
High-Vacuum Hose with Claw-Clamp Fittings

Hose

Hose
- Temperature Range: Not Rated
- Material:
6" Lengths: 321 Stainless Steel
Other Lengths: 304 Stainless Steel - Fitting Material: 304 Stainless Steel
For Tube OD | Flange OD | High-Vacuum Flange Size | ID | OD | Wall Thickness | Bend Radius | High Vacuum Connection Type | Max. Vacuum | Each | |
6" Lg. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
2 1/2" | 3.74" | 63 | 2 1/2" | 3 5/16" | 0.008" | 2 3/4" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 0000000 |
3" | 4.33" | 80 | 3" | 3 15/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 15/16" | 0.008" | 3 1/2" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 7/8" | 0.01" | 5 1/4" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
12" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
24" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 00000000 |
36" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 00000000 |
39" Lg. | ||||||||||
2 1/2" | 3.74" | 63 | 2 1/2" | 3 3/16" | 0.008" | 3" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 3" | 3 7/8" | 0.008" | 6" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 4" | 4 13/16" | 0.008" | 8" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 6" | 6 15/16" | 0.01" | 15" | ISO-K | 1 × 10 -9 torr @ 72° F | 0000000 | 00000000 |
Clamps

Double-Claw Clamp

Single-Claw Clamp
For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Each | |
Double Claw | |||||||
---|---|---|---|---|---|---|---|
2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
Single Claw | |||||||
2 1/2", 3", 4" | 3.74", 4.33", 5.12" | 63, 80, 100 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
6" | 7.09" | 160 | ISO-K | Aluminum | 1 × 10 -9 torr @ 72° F | 0000000 | 0000 |
Rings

Ring
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 | |
2 1/2" | 3.74" | 63 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 000000 |
3" | 4.33" | 80 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 000000 | 00000 |
4" | 5.12" | 100 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 00000 |
6" | 7.09" | 160 | ISO-K | Viton® Fluoroelastomer Rubber | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 400° | 0000000 | 00000 |