Brand New itemsMade of Stainless Steel 30414 threads per inchesPitch angle 55 degree with round peak & valleyBSPT thread is also called PT Rc threadCommonly used thread in China, UK, Australia & JapanNot compatible with NPT threadNever mate NPT with BSPTAdapter KF-16 to 3/4" Male BSPT adapter, Flange Size ISO-KF NW-16, Stainless SteelThese adapters are KF-16 to 3/4" BSPT Male pipe thread. They are commonly used to make connections between ISO-KF and BSPT-Female 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 corrosive resistant stainless steel.On Apr-14-17 at 16:03:06 PDT, seller added the following information: