These KF Centering Ring vacuum fittings follow KF standards and have flange sizes from KF10 to KF50. They are commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble. A circumferential clamp and centering ring form the vacuum seal between the connecting flanges. The centering ring contains a rubber elastomer o-ring. The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50, respectively. They are made of corrosive-resistant Stainless Steel with Viton® O-Ring. Viton® is well known for its excellent resistance to heat (400°F/200°C) and to aggressive fuels and chemicals. \n Part No. Size A B C D C/R O-Ring EV01034 KF10 10 12 8 3.9 304 S.S. Viton EV01035 KF16 16 17 8 3.9 304 S.S. Viton EV01036 KF25 25 26 8 3.9 304 S.S. Viton EV01037 KF40 40 41 8 3.9 304 S.S. Viton EV01038 KF50 50 52 8 3.9 304 S.S. Viton
