Bellows Hose Metal KF-25, 40 Inch, Medium Wall Tubing, ISO-KF Flange Size NW-25, Stainless Steel
These KF-25 Metal Hose Bellows Flex Coupling (40 inch, medium wall) vacuum fittings follow ISO-KF standards and have a flange size of NW-25. They are unsheathed and butt welded. 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.
KF-25 Metal Hose Bellows Flex Coupling, Medium Wall
ISO-KF Flange Size: NW-25
Spring Rate: 3.4 lb/in
Common Dimensions: A = 39.40" (1000mm)