MIL-STD-8879C (obsolete) contained paragraph 6.3 which is titled: Class 3BG.
MIL-STD-8879C: 6.3 Class 3BG According to MIL-S-8879C paragraph 6.3 Class 3BG states: Class 3BG for high temperature applications shall no longer be used in new designs. This special class-of-fit for internal threads provides an allowance to both the GO and NOGO work plug gage pitch diameters of +0.0030" for 32-TPI and coarser. For finer ptch threads (finer than 32-TPI) +0.0010".
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Original Posting: 11/13/2012
Last Revision: 8/8/2016
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