BSA M20 Rear Brake Drum Flange Bolt with taper seat 66-6070
This is the upgraded bolt used from frame number WM20 82773 (1943)
Many pre 1943 bikes would have been upgraded to the new brake drum and wheel hub.
The thread form is 7/16" x 18TPI 55 degree BSF
We can now supply 33-5530 that uses a flat seat and spring washer.
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