# Formula that will calculate the NoGo Major Diameter of an M20 x 1.5 6H Thread gage

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Hello,

I am needed the formula that will calculate the NoGo Major Diameter of an M20 x 1.5 6H Thread gage. The Nogo PD is 19.2157.

#### Stijloor

Staff member
Super Moderator
Re: Formula that will calculate the NoGo Major Diameter of an M20 x 1.5 6H Thread gag

A Quick Bump!

Can someone help?

Thank you very much!!

S

#### smkeilman

Re: Formula that will calculate the NoGo Major Diameter of an M20 x 1.5 6H Thread gag

The basic major diameter of a NO GO plug for any metric M-Thread is the basic pitch diameter of the NO GO member plus 0.2p, e.g.

19.216+0.2*1.5=19.516 mm

Tolerance is on a sliding scale with basic size and pitch, and is applied minus. For this case, the tolerance is 0.015 mm.

Values are found in ANSI/ASME B1.16M

##### Involved In Discussions
Re: Formula that will calculate the NoGo Major Diameter of an M20 x 1.5 6H Thread gag

SmKeilman, Thank you for your help.

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