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THREAD RING GAGES

Thread ring gages are used to check an external threaded part. The most common classes of fit are:
-2A...a general purpose class of fit (sometimes used as a before plate for a 3A) and
-3A...used to check parts with "closer" tolerance requirements.
Other classes of fit and special pitch diameters are available upon request.

The part being checked is generally acceptable when it does not enter the NOGO ring gage more than 1½ to 3 turns dependent upon customer specifications. NOGO ring gages have an annular groove around the outside for identification.

The GO thread ring gage checks all functional geometries of the threaded part with the exception of the major diameter. The products' thread should freely enter the GO thread ring gage for the entire length of the threaded portion.

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