Knowledge about plug gauges: *What is the difference between a go and no go gauge?
AGOcylindrical plaingaugeis intended togointo/onto the piece being tested. ... ANOGOcylindrical plaingaugeis intendednot to gointo/onto the piece being tested. TheNOGOis testing the minimum material condition.
*What is the difference between 6H and 6g threads?
The 5g indicates the tolerance class for the pitch diameter and6gis the tolerance class for the major diameter. ... For example M12 x 1 -6H/5g6g indicates a tolerance class of6Hfor the nut (female)threadand a 5g tolerance class for the pitch diameterwith a 6gtolerance class for the major diameter.