Shimano Octalink Bottom Bracket

SHIMANO BB-ES51 Bottom Bracket
suitable for Octalink, 8-point star fitting.
Shimano 105, Deore LX range level.
For 68mm wide box.

BSC thread (1.37x24 mm x 24 TPI) also called BSA or Euro BB.

How to recognize the thread of your bottom bracket: BSA or Italian thread ?

BSA cases are marked 1.37 x 24 and the frame bottom bracket is 68mm wide, and sometimes 73mm.
The Italian step cases are marked 36 x 24 and the frame's bottom bracket is 70mm wide.