Shuangzhan machinery provides male and female to vacuum flange adapters both.
Stainless Steel NPT-F pipe adapters are used to convert NW10 to NW50 size ISO-KF vacuum flanges to a female thread NPT pipe connection.
These adapters are KF flange NPT female pipe thread. They are commonly used to make connections between ISO-KF and 1/4 inch NPT-Male pipe. The ISO-KF flanges 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 stainless steel 304 and 316.