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. *Ream the hole before tapping with a reamer having a taper of 3/4 inch per foot.Pitch Diameter at Beginning of External Thread Start (inch)Įffective Thread, External Diameter (inch) Length from end of pipe to plane of hand-tight engagement ![]() Pitch diameter at plane of hand-tight engagement
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