Thread Angle
Thread Angle : The included angle between the thread flanks. The flank angle of thread shall be defined as the angles between the flanks and a perpendicular to the thread axis. For 60 degree threads, the flank angles are half angles of the thread and therefore equal. For buttress threads, the leading flanks are 20 degrees and the following flanks are 3 degrees. For extremeline threads, the leading flanks are 6 degrees and the following flanks are 6 degrees. (Spec 5B)
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