Virtual functional diameter, taper thread Per ASME B1.7-2006 Definitions [ back to main page ]
Virtual functional diameter, taper thread: (ISO term) when a thread size of a taper thread is verified by measurement of a taper thread plug, ring gage, or equivalent, having a basic gage notch, surface, or limit notches, andwhich is within specified gage limits or tolerances, a determination is made that the virtual (functional) diameter throughout the specified size limits. The thread size, thus verified, may be designated the taper thread virtual diameter.
Original Posting: 3/20/2012
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