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Automotive Engineering other topics FAQ

Valves

Dimensions of standard tire valve by GregLocock
Posted: 22 May 03 (Edited 27 Oct 08)

According to the Tire and Rim Association (and they should know) the standard Schrader valve has the following thread

7.7 mm OD

32 tpi, or 0.794 mm pitch

Minor diameter is 6.9mm

Thread designation is .305-32 or 7.7-32

Nice mix of inches and millimetres!

The internal thread, ie the valve core thread, is  5.2-36, ie 5.2 OD by 36 tpi.

 

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