Adaptive Centering Ring Assemblies

Adaptive centering ring assembles allow you to adapt directly from the rarely used ISO-QF sizes (QF10, QF20, and QF32) to commonly available ISO-QF sizes (QF16, QF25, QF40). The adapted assembly can be fastened with a standard clamp that corresponds with the larger of the two sizes.


  • High Vacuum Rated to 1×10-8 Torr
  • Compatible with all ISO standard vacuum flanges
  • Reusable
  • Quick sealing and disassembly


  • Centering Ring: 316 Stainless steel (Aluminum Available Upon Request)
  • O-Ring:
    • Standard: PTFE
    • Alternative: Buna-N or silicone (Contact Us for Price and Delivery)

Product Notes:

  • Metal centering ring aligns flanges during seal assembly and provides support for the elastomer sealing ring
  • Replaceable o-ring

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B C Material Seal Material 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4000054Reference NumberQF10/16-ACR-VTA 0.7B 0.47C 0.39Material 304 SSTSeal Material FKM3D CADLoginDrawingLoginUnit Price$13.20Contact
Part ID4000055Reference NumberQF20/25-ACR-VTA 1.02B 0.87C 0.81Material 304 SSTSeal Material FKM3D CADLoginDrawingLoginUnit Price$12.00Contact
Part ID4000056Reference NumberQF32/40-ACR-VTA 1.61B 1.34C 1.26Material 304 SSTSeal Material FKM3D CADLoginDrawingLoginUnit Price$21.7016