There are several types of valve threads

American automobile valve thread size:

The standard writing method is 3 / 8-32unef, the major diameter of thread is 9.5-0.152, and the pitch diameter is 8.9mm. American unified thread, UNC coarse thread, UNF fine thread, UNEF ultra fine thread.

Valve introduction: the function of the valve is to inflate and deflate the tire and maintain the seal after inflation. Common valve is composed of valve body, valve core and valve cap.