The BTS1 is a precision tool system which provides a piloted means of tapping the threads in the bottom bracket shell of a frame. After tapping, the taps act as guides to keep the included facing cutter perfectly square with the axis of the bottom bracket for cleanup of the faces of the bottom bracket shell. The BTS1 includes English taps, 1.370 x 24 TPI right hand thread for the adjustable cup, and 1.370 x 24 TPI left hand thread for the fixed cup.
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