Stub Unbored Flange, Yellow Brass, KF-40 Vacuum Fittings, ISO-KF 40-NW Flange
These KF-40 Yellow Brass Unbored Stub fittings follow ISO-KF standards and have a flange size of NW-40. 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 Yellow Brass.
Brass alloys contain Zinc. Zinc will outgas from brass under certain combinations of elevated temperature and high-vacuum. System damage may occur if these conditions are present.
Stub Unbored Yellow Brass
ISO-KF Flange Size: NW-40
Common Dimensions: A = 1.50" (38mm), B = 1.00" (25mm)