Thread Ring Gauge Specifications

Michael_M

Trusted Information Resource
#1
I am looking for the spec, (AMS, MIL, etc) that specifies checking threads with a ring gauge.

More information: We have parts that the No-Go thread gauge is going on the thread 1/2 turn then stops. We run our threads to the small side so when we plate the part (in this case .0002 build up) the go gauge still goes. I measure the Pitch diameter and it shows .0008-.001 over the bottom pitch. However, the no-go still starts on the thread. I believe this is normal as this is the lead thread; however, I am looking for a specification that I can point to that shows I am right (or wrong). I cannot find a specification number.

Thanks in advance.
 
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B

breid

#3
The NBS H28 handbook for screw-thread standards states that the maximum number of turns a part can go into a no go threaded ring is 3. It must stop, not just feel drag at that point. Of course, if you have a limited number of threads, you have to use a little judgement.
 
J

Jeff Frost

#4
Basics on use of gage: The GO ring must enter onto the full length of the threads and the NOT-GO (or NO GO) must not exceed three full turns.

Also you need to have the correct set of gages. If you are inspecting threads before plating you need to have your gage maker create a set of “before plate” gages that take into account the missing plating thickness. After plating the threads must meet the NBS H28 thread form.
 
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