Plug Gage Application To Part
The Go gage should pass completely across or into the product threads. Application of force to engage the Go gage member with the product indicates the product is smaller than the minimum allowable size. Forcing the Go gage to engage with the product will increase the size of the product making it acceptable but wear the gage unnecessarily resulting in a sharp decrease in the life of the Go gage.
INCH: NOT MORE THAN THREE COMPLETE TURNS
For inch threads, the NoGo should never go beyond the third thread or less if modified.
METRIC: DEFINITE DRAG BEFORE SECOND TURN
For metric threads the NoGo could theoretically go the full length but should not be continued once the definite drag is felt. If the NoGo engages with the product more than the specified requirements the product is smaller than the minimum acceptable size.
Modification of the above requirements may be necessary when the
product is thin having few complete threads or when the product is of a
material that may stretch or give.
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