![]() When using L1 gauges to check threads, the thread is within permissible tolerance if the ring gauge face, or plug gauge notch, is +/- 1 turn from being flush with the end of the thread.**' = Truncation from point of thread triangle to flat (not shown in diagram).This is also the pitch diameter at the gauge plane. E = Pitch diameter at hand-tight plane. ![]() Pipe Size is the accepted industry designation and does not refer to either the inside or the outside diameter (ID or OD) of a pipe or a fitting.
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