BB4039: Aluminum T47, 1.937" OD x 68 mm Wide

BB4039: Aluminum T47, 1.937" OD x 68 mm Wide

22 In stock

  • Buy 10 for $18.76 each and save 8%
  • Buy 25 for $17.20 each and save 16%
  • Buy 50 for $15.65 each and save 24%


This T47 bottom bracket shell is machined from 2" 6061 aluminum bar. The outside diameter is 1.937", textured to provide a mechanical interface with the bonding epoxy used in carbon fibor frame production. The width is 68 mm. 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 outside diameter 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.

Item sold individually.



Item Number BB4039
Weight/Grams 26
Alloy 6061
Style T47
Outside Diameter 1.937"
Actual Width 68 mm