High Vacuum – KF / ISO-K Clamp

The KF (Klein Flansch – small flange) and ISO-K (derived from KF) clamp system is a widely used method for creating vacuum connections in high vacuum applications, typically reaching pressures in the 10^-7 to 10^-8 Torr range.

Advantages of KF/ISO-K for High Vacuum:

  • Ease of Use: The KF/ISO-K system is known for its quick assembly and disassembly without requiring complex tools, making it ideal for frequent connections and disconnections.
  • Cost-Effective: With their simpler design, KF/ISO-K components are generally less expensive.
  • Relatively Leak-Tight: With proper assembly and good quality O-rings, the KF/ISO-K system can achieve the high vacuum levels needed for many applications.
pRODUCTSvARIATIONS
Sizes (Tubes Diameter)
KF 25 (1″), KF 40 (1-1/2″), KF 50 (2″)
Bored flange, Blind flangeSS304 / SS316
Centering Ring with O-ringSS304 / SS316, outer ring (positive pressure)
Wingnut ClampAluminum / SS304
Viton O-ring-20 – 200°C Operating Temperature
Fittings – Elbow, Tee, Reducer, Pipe, BellowButtweld to Flange, c/w Flange
How to connect KF fittings
How to connect ISO-K fittings
ItemsVariations
Sizes (Tube Diameter)
ISO 63 (2-1/2″), ISO 80 (3″), ISO 100 (4″) , ISO 160, 200
Bored flange, Blind flange
SS304 / SS316
Centering Ring with O-ring and Outer ring
SS304 / SS316, outer ring (Aluminum)
Double Claw Clamp
Aluminum body, M8 SS304 screw
Viton O-ring
-20 – 200°C Operating Temperature
Fittings – Elbow, Tee, Reducer, Tube, Bellow
Buttweld to Flange, c/w Flange