kogel bearings threaded bottom bracket
BSA is the classic English thread for mountain bikes.
Frame shell width is typically 73mm with a 1.37"x24tpi thread. Other frame widths are 68mm on vintage frames, 83 mm for downhill bikes and 100 for fat bikes.
The bottom bracket is typically the same, regardless of the frame width. Crank spindles come in different lengths to match the different shell sizes.
Kogel Bearings provides options for all compatible crank standards.