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BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: brian thombs on 05 Mar, 2021, 16:23

Title: 1946 B31 350cc frame bolts and studs
Post by: brian thombs on 05 Mar, 2021, 16:23
Hi Guys, very simple question, can you tell me are the  studs/bolts that hold the frame sections and plates together BSF  or Cycle thread, I want to replace the nuts but use original my studs.
regards
BT
Title: Re: 1946 B31 350cc frame bolts and studs
Post by: idie on 05 Mar, 2021, 16:25
They should be cycle thread.
Title: Re: 1946 B31 350cc frame bolts and studs
Post by: martinh10 on 05 Mar, 2021, 17:32
The original studs are 3/8" cycle thread (CEI) 26 tpi. 3/8" BSF are 20 tpi.
Title: Re: 1946 B31 350cc frame bolts and studs
Post by: brian thombs on 05 Mar, 2021, 18:27
many thanks guys
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