These KF Centering Ring overpressure vacuum fittings follow KF standards and have flange sizes from KF16 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. 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 C/R O/R O-Ring EV01039 KF16 16 32.5 8 304 S.S. Al Viton EV01040 KF25 25 42.5 8 304 S.S. Al Viton EV01041 KF40 40 57.5 8 304 S.S. Al Viton EV01042 KF50 50 77.5 8 304 S.S. Al Viton
