O-Rings (Buna-N)

These replacement elastomeric o-rings are used (in conjunction with a centering ring - not included) for sealing KF flanges. The KF (QF) flange is used for through or foreline vacuum plumbing and for simple HV chamber ports.

O-Rings Feature:

  • O-Rings available in fluorocarbon, Buna-N (nitrile rubber), and silicone materials
  • The more popular o-ring sizes for vacuum use are listed below
Flange Size Material O-Ring ID O-Ring
Cross Section
KF10 Buna-N 15.2 5.3 0.25
KF16 Buna-N 18.3 5.3 0.25
KF25 Buna-N 27.9 5.3 0.25
KF40 Buna-N 40.6 5.3 0.25
KF50 Buna-N 53.3 5.3 0.25


DATA | /gallery_1/rozmery_kf_komponentu | Replacement_O-Rings.jpg