Thin cup vs. thick cup:
Traditional bottom brackets of all threadings (or at least those in popular use) can be found in two different variants - thick-cup and thin-cup:
Components from each type should not be mix and matched with each other, as explained below:
Thick cups are usually 4.0mm in thickness from the outside face of the cup to the edge of the cup's bearing raceway (F); thin cups are generally 2.0mm, with some exceptions.
This means that a bottom bracket spindle made for thick cups will have raceways (B) spaced 4mm narrower than a spindle made for use with thin cups*. Even though bottom bracket sets of each type can be used to achieve the exact same overall spindle width (D) and offset, it is impossible to mix and match cups and spindles from each type. The differing cup and spindle thicknesses will result in the adjustable cup threading too far into the bottom bracket shell (thin cups + thick cup spindle) or sit too far outboard (thick cups + thin cup spindle). In theory, the latter combo can be used as a last resort, but there is a possibility that the left crankarm will bottom out on the cup.