How many types of valve threads are there

American car valve thread size:

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

Introduction to the valve: The function of the valve is to inflate and deflate the tire and maintain the seal after the tire is inflated. Ordinary valves are composed of three main parts: valve body, valve core and valve cap.