Rotatable Bolt Ring

Rotatable bolt rings are a subcomponent that fits around the outer diameter of a claw clamp-style LF flange. This allows the flange to behave as a rotatable bolted style LFB flange to ease bolt-hole alignment issues when assembling the vacuum system.  After the rotatable bolt ring is mounted to the LF flange, a bolt kit is used to fasten the two flanges together.


  • High Vacuum Rated to 1×10-8 Torr
  • Compatible with all ISO standard vacuum flanges and fittings
  • Has a low profile compared to claw clamp fasteners


  • Body: Aluminum
  • Retaining Ring: Stainless Steel

Product Notes

  • Converts ISO-LF flanges to rotatable ISO-LFB flanges
  • O.D. and bolt pattern match ISO-LFB flanges
  • Retaining ring included

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA O.D. B Thickness 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4500060Reference NumberLF63-250-RBRA O.D. 5.12B Thickness 0.473D CADLoginDrawingLoginUnit Price$145.00Contact
Part ID4500061Reference NumberLF80-300-RBRA O.D. 5.71B Thickness 0.473D CADLoginDrawingLoginUnit Price$155.00Contact
Part ID4500062Reference NumberLF100-400-RBRA O.D. 6.5B Thickness 0.473D CADLoginDrawingLoginUnit Price$175.006
Part ID4500063Reference NumberLF160-600-RBRA O.D. 8.86B Thickness 0.633D CADLoginDrawingLoginUnit Price$399.00Contact
Part ID4500064Reference NumberLF200-800-RBRA O.D. 11.22B Thickness 0.633D CADLoginDrawingLoginUnit Price$426.00Contact
Part ID4500065Reference NumberLF250-1000-RBRA O.D. 13.19B Thickness 0.633D CADLoginDrawingLoginUnit Price$585.00Contact
Part ID4500066Reference NumberLF320-1200-RBRA O.D. 16.73B Thickness 0.793D CADLoginDrawingLoginUnit Price$873.00Contact
Part ID4500067Reference NumberLF400-1600-RBRA O.D. 20.08B Thickness 0.793D CADLoginDrawingLoginUnit Price$945.00Contact
Part ID4500068Reference NumberLF500-2000-RBRA O.D. 24.02B Thickness 0.793D CADLoginDrawingLoginUnit Price$1,088.00Contact