Tee Reducer KF-40 to KF-25 Vacuum Fittings, ISO-KF Flange Size NW-40 to NW-25 Stainless Steel
These Tee Reducer KF-40 to KF-25 fittings follow ISO-KF standards and have a flange size of NW-40 to NW-25. 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 (please see top right figure - click to enlarge). 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.
ISO-KF Flange Size: NW-40 to NW-25
Common Dimensions: A = 4.80" (122mm), B = 2.30" (58mm)