BSA M20 Crankcase Shield Chaincase Stud Nut
Shouldered 1/2" x 20TPI
These items were bought in and found not fit for purpose.
They are now a PES manufactured part.
Treated to a zinc and black passivation which can be overpainted.
Also fits other items
Part numbers
66-2726
40-3227
57-2730
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