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cnc machining , there is no thread table to check. How to calculate British thread

Aug 12,21

CNC machining, there is no thread table to check. How to calculate British thread

(e.g. 3 / 16-32 unf-1b) 3 / 16 is the major diameter (outer diameter) of thread, calculated in inches, 1 inch = 25.4 mm
32 refers to 32 threads per inch, which specifies the pitch
UNF is united fine
Thread, i.e. British fine thread, some are UNC, and C refers to coarse, i.e. coarse thread
1b is the tolerance accuracy level, and similar levels include 2a, 3a, etc
For example: 3 / 16-32
It means that there are 32 teeth per inch of length, because 1 inch is equal to 25.4 mm, then 25.4/32 is the pitch and 25.4 / 16 * 3 is the outer diameter.
 
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