When I studied in a mechanical engineer, a teacher who just come back from America, he explained testing for eighter enough torque by a test called 'go nor go'. That is the last torque against the limit talk.However, presently no one understands the phrase 'go nor go' that I said at first. Do such the phrase stillremain? What is the fact of the phrase 'go nor go'? Many thanks to Google Translate ....