These KF Centering Rings with screen vacuum fittings follow KF standards and have flange sizes from KF10 to KF50. These centering rings with screen mesh are useful in many situations in which a vacuum system or instrument needs to be protected from contamination by particulate generated from outside the system or from within. 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 Material-C/R Material-O'Ring Mesh/ln*2 EV01197 KF16 12 17 3.9 304 S.S. Viton 900 EV01198 KF25 20.5 26 3.9 304 S.S. Viton 900 EV01199 KF40 35.8 41 3.9 304 S.S. Viton 900 EV01200 KF50 46.3 52 3.9 304 S.S. Viton 900
