After threading operation in turning, In operation 07 Key way will complete, After key way thread gauge is not answering due to burr is folding in threads.
Before Key way operation all the parts is checking with gauge and found ok.  
Due to problem facing in gauge entry after the key way, we planned to rework with OD thread Die and this operation is manually done. This is a first batch with new process and out of 247 nos. 01 no. rejected due to NOGO answering.