This T47 bottom bracket shell is machined from 2" x .095" wall 4130 steel tubing. The outside diameter is the the stock tube diameter. The width is 87.5 mm, supplied 1 mm oversize to allow clean up after welding. The threads are M47 x 1, right and left hand, with a thread length of 0.50". The left hand thread is identified by a radial groove on the face of the shell. The minor diameter of the thread is 46 mm +.1/-0 and is relieved on the inside diameter to 47.75 mm +/- 0.1.
- Use our tap FT2001 or FT2002 (see Related Products on this page). Note: do no apply excessive force on the tap, it will break! See our Guidelines for Use.
- Video of how to tap a T47 bottom bracket shell here.
Item sold individually.