Half Nipple, Braze Stub Yellow Brass KF-40, Vacuum Fittings, 1.625 In. OD Tube, Size ISO NW-40, (Sold as one each)
These KF-40, Yellow Brass, 1.625 inch OD tube, Half Nipple Braze 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.
Half Nipple braze stub yellow brass
ISO-KF Flange Size: NW-40
Common Dimensions: A= 1.625 inch (41mm) B= 1.58 inch (40mm)
For tubing Outer Diameter 1 5/8 inch