Single Claw Clamp

Claw clamps require the use of more than one clamp per flange connection. They require more work per seal assembly, but offer greater strength than the quick clamp if the seal assembly must bear a lateral load. They are traditionally the most popular clamps for ISO sizes LF63 and larger. These clamps are the only clamps capable of sealing sizes LF250 to LF500.



  • High vacuum rated to 1×10-8 Torr
  • Compatible with all ISO standard vacuum flanges and fittings



  • Body: Aluminum
  • Hardware (bolts and washers): Stainless Steel


Product Notes

  • Fastens ISO-LF flanges to tapped ISO-LFB flanges or components (valves, chambers) with a compatible bolthole pattern and sealing groove


Options (Contact us for price and delivery)

  • Stainless steel clamp body

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B C D Bolt Size Flange Size 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4500003Reference NumberLF63/100-SCCA 0.95B 1.2C 0.655D 0.39Bolt Size M8x35Flange Size 63 / 80 / 1003D CADLoginDrawingLoginUnit Price$5.65209
Part ID4500004Reference NumberLF160/250-SCCA 1.1B 1.25C 0.785D 0.39Bolt Size M10x35Flange Size 160 / 200 / 2503D CADLoginDrawingLoginUnit Price$6.95382
Part ID4500005Reference NumberLF320/500-SCCA 1.34B 1.57C 0.985D 0.72Bolt Size M12x50Flange Size 320 / 400 / 5003D CADLoginDrawingLoginUnit Price$11.159