Centering Ring Vacuum Fitting for Vacuum Systems

  • High temperature resistance
  • Excellent resistance to aging and ozone
  • Low gas permeability, low compression set
  • Sizes include KF16, KF25, and KF40 (NW/QF)


  • The centering ring has excellent resistance to:
    • Acids, fuels, mineral and vegetable oils and greases
    • Aliphatic, aromatic and chlorinated hydrocarbons, and non-flammable hydraulic fluids (HFD)
    • Many organic solvents and chemicals
  • Low swelling in ASTM oil No. 1, IRM 902 and IRM 903.
  • Select from KF16, KF25, or KF40 (NW/QF)
  • 304 Stainless with Viton® O-Ring
  • Max temperature 200°C
  • Use with Stainless Wing-Nut Clamp | NW16, NW25, or NW40

Viton (Fluorocarbon, FKM) O-Ring – KF40 (NW/QF)

  • 200°C Maximum
  • KF40 (NW/QF) High Vacuum Hardware
  • KF40 (NW/QF) Stainless Centering Ring Assembly With Viton (Fluorocarbon, FKM) O-Ring

Product Inquiry

centering ring | vacuum fitting
Centering Ring | Stainless with Viton® O-Ring | KF16, KF25, or KF40