Originally Posted by
Monch07
I should have said, the Allen key for the bolt was 6mm, but the bolt is 8mm diameter.
Yes, I know. All the bolted square taper bottom brackets i've ever seen use an M8x1.0 threaded bolt. The hex head versions are either 14 or 15 mm. Allen type fixing bolts use either an 8 mm, or more rarely, a 6 mm Allen wrench.