Gauge plane: An ISO taper pipe thread term equivalent to the U.S. term “plane of hand tight engagement, X=1". Its location from the reference plane at the small end of the thread is called the gauge length, L1 in the U.S., and the major diameter at this plane is called the gauge diameter, D1, in U.S.
Original Posting: 3/20/2012
Last Revision: 8/4/2015
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