Connection Style Connection Style |
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Claw Clamp |
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Socket Connect |
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Butt Weld |
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For Tube Material For Tube Material |
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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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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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Claw Clamp Type Claw Clamp Type |
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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.

Adapter, Tube ×
Socket-Connect Tube
For Tube OD | Flange OD | High-Vacuum Flange Size | Socket Depth | High Vacuum Connection Type | No. of Claw Clamps Required | Material | Max. Vacuum | Each | |
2 1/2" | 3.74" | 63 | 7/32" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 7/32" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
4" | 5.12" | 100 | 7/32" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 00000 |
6" | 7.09" | 160 | 7/32" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |

For Tube OD | Flange OD | High-Vacuum Flange Size | Wall Thick. | High Vacuum Connection Type | No. of Claw Clamps Required | Material | Max. Vacuum | Each | |
2 1/2" | 3.74" | 63 | 0.065" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
3" | 4.33" | 80 | 0.065" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | 0.083" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | 0.083" | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |

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 | 0000000 |
3" | 4.33" | 80 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 000000 | 000000 |

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 | 0000000 |
3" | 4.33" | 80 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
4" | 5.12" | 100 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |

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 | 0000000 |
3" | 4.33" | 80 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 000000 | 000000 |
4" | 5.12" | 100 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |
6" | 7.09" | 160 | ISO-K | 4 | 304 Stainless Steel | 1 × 10 -9 torr @ 72° F | 0000000 | 000000 |

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 |

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 |


For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Bolt Material | Max. Vacuum | Each | |
Double 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 | 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 |
Clamps for Claw-Clamp High-Vacuum Fittings for Stainless Steel Tubing
Connect claw-clamp high-vacuum fittings for an airtight seal. For a complete connection, you'll need four clamps and a ring (sold separately).
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 | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Bolt Material | Max. Vacuum | Each | |
Double 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 | 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 |

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 |