Fulcrum / Crankshaft Nut, for use on BSA models: A7, A10, A50, A65, B25, B40 & C25.
O.E.M: 42-5864.
Supplied: Singles
Application: 
B40 Front Wheel Brake Fulcrum Pin Nut
A7, A10, A50 & A65 Front Wheel Brake Fulcrum Pin Nut
A7, A10, A50 & A65 Rear Wheel Anchor Bar Nut
B25 & C25 Crankshaft Nut