M4 nogo plug gage torque limits
M4 nogo plug gage torque limits
(OP)
Hello everyone,
First timer here. My company is dealing with a supplier who believes that I, the incoming inspector, am forcing the no go side of my plug gage into some threaded holes. I use two fingers to turn the gage and I am by no means using a lot of force. For sanity's sake I'd like to measure the torque used, but I haven't been able to find torque specifications. Does anyone know of a torque standard for no go plug gages?
First timer here. My company is dealing with a supplier who believes that I, the incoming inspector, am forcing the no go side of my plug gage into some threaded holes. I use two fingers to turn the gage and I am by no means using a lot of force. For sanity's sake I'd like to measure the torque used, but I haven't been able to find torque specifications. Does anyone know of a torque standard for no go plug gages?





RE: M4 nogo plug gage torque limits
I'm a bit confused by the stated argument. A threaded feature deemed acceptable by forcing a No-Go gage into it is disadvantageous to the purchaser and advantageous to the supplier.
RE: M4 nogo plug gage torque limits
We are receiving parts from a supplier which has M4 threaded holes. When I check the holes with my no go gage some accept the gage well beyond three turns. As such, I deem the parts unacceptable.
The supplier believes that their process is just fine and that the reason my gage is being accepted in the holes is because I am forcing it in.
Obviously, I disagree with their analysis of the problem. I plan to measure/limit the torque applied to the gage, but I am looking for an industry standard that is more specific than simply stating the gage "should not be forced".
RE: M4 nogo plug gage torque limits
You've rejected the parts and won't pay for them.
It's up to the supplier to convince you, in a way satisfactory to you, that the parts are good, or give you good parts.
ANY compromise on your part will ultimately result in you with a pile of bad parts.
RE: M4 nogo plug gage torque limits
RE: M4 nogo plug gage torque limits
RE: M4 nogo plug gage torque limits
The supplier has come in already and we have both checked several pieces at the same time, but the parts had already been inspected once by me. In this case they found that their no go gage entered into the same holes as mine and agreed that those parts were rejectable.
Their most recent lot was inspected simultaneously by the supplier and I for the first time. None of the M4 holes on these parts accepted a no go gage. Naturally, I'm happy to accept this new lot, but I don't want them to send in parts with oversized holes in the future and claim that their process is perfect and my inspection is the cause for the defect. They often send parts that are missing holes, missing threads in holes and in one case there was a broken tap in a hole that was supposedly checked with both go and no go gages. I, on the other hand, am quite confident that I am not applying excessive force on the gage, but I can't really say that definitively.
It's unfortunate that there isn't some standard for the force applied on plug gages, as "excessive force" is an extremely subjective term.
Thank you all again.