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When inspecting a screw, what should you do if the GO stops and the NOT-GO passes, contrary to normal?
In that case, the screw judgment will fail.
The NOT-GO gauge has a low chevron to check only the single effective diameter.
If the NOT-GO gauge passes, the effective diameter is poor.
If it's internal thread , it's excessive. If it's external thread , it's under.
The GO gauge has a shape similar to that of the threaded chevron of the workpiece material, and the total effective diameter (single effective diameter, chevron and pitch) is confirmed by passing it through the workpiece length gauge.
When the NOT-GO gauge passes and the GO gauge stops, it means that the GO gauge is interfering with the workpiece material in a way other than the single effective diameter.
If it is internal thread , it may be core diameter or minor diameter dimensions are undersized or the shape is not good.
If it is external thread , it is possible that the dimensions of the outer diameter or valley diameter are excessive or the shape is not good.
If the GO gauge becomes progressively tighter and does not seem to pass through, a pitch abnormality is possible.
GO It may not pass through due to welding or scratches on the gauge.