Thread Plug Gauge Tolerances

#1
Hi,

Could someone help me point me in the right direction, or explain to me how to determine what the tolerances are for Go/NoGo thread plug gauges. I know that they reference pitch diameters and I am familiar in how they are measured, but I can't seem to find anything that helps me when it comes to what these pitch diameters' tolerances are when measuring. I'm trying to set up, and/or correct our calibration system characteristics for each of the gauges as I'm not sure that what was originally inputted is correct.

Any help is greatly appreciated. Thanks!

Cheers!
 
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Jen Kirley

Quality and Auditing Expert
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#2
Welcome to The Cove! :bigwave:

According to Alpha Thread Gage Inc., thread gages are made to Class X tolerances. Their web page has a table showing tolerance by size and feature.

I have no affiliation with Alpha Thread Gage.
 

dwperron

Trusted Information Resource
#4
Hi,

Could someone help me point me in the right direction, or explain to me how to determine what the tolerances are for Go/NoGo thread plug gauges. I know that they reference pitch diameters and I am familiar in how they are measured, but I can't seem to find anything that helps me when it comes to what these pitch diameters' tolerances are when measuring. I'm trying to set up, and/or correct our calibration system characteristics for each of the gauges as I'm not sure that what was originally inputted is correct.

Any help is greatly appreciated. Thanks!

Cheers!
The ANSI/ASME B1 series of documents are available. They are the bible of thread measurements.
 
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