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Title: How Reliable Is Pitch Diameter Size Transfer From Setting Plug To Adjustable
Author: Arthur G. Strang
Source: 1999 Measurement Science Conference
Year Published: 1999
Abstract: The ASME standard procedure for transferring the measured pitch diameter of thread setting plug gage to an adjustable ring gage is by fit or feel. To determine the size variation, pitch diameter of the internal thread was measured after each assembly. Ten different manufacturers of 0.5-13 UNC setting plugs were used to set ten different manufacturers adjustable ring for both GO and NOT GO gages. The fit was controlled between 15 and 50 inch ounces of breakaway torque. The difference in pitch diameters was as great as 0.0014 inch on some of the 200 different combinations of interchanges, made to ASME B1.2 tolerances.

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