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Thanks for the link. I will look into the gage.

Thank you all for the input. Ajack1, you are not missing anything. The engineer signs off on the lot because the screw doesn't bottom out. Unfortunately, the inspector makes life hell for the rest of us until the review board dispositions the parts and engineering does sign off. A simple ECO...

This is a "as cost effective as possible" standoff. It measures .375 od x .750 long. one end has a 6-32 thread the other has a 10-32 x .380 deep callout. The sheet thickness is .09 thk 6061-T6. the screw is a 10-32 x 3/8 long. I am beating a dead dog on this one. Until we can agree on one...

We have tried the second method. QC recognizes this as a good method, and uses it, but says "varying chamer depth affects the measurment". We have also ground a screw to as close as our visual inspection can determine to the start of the first full thread. from there "counted" the # of turns on...

I am trying to determine the most commonly accepted way of measuring the depth of a threaded blind hole. The drilled hole is plenty deep to go past what is needed, but our QC is rejecting based on their method of measuring the threaded portion depth. Any ideas would be appreciated.