Five? Maybe more...
There is BA (British Association) which is more metric than anything and
doesn't use the 55 degree
but is a British thread form.
But, I would think, that there is for sure a 6th. CEI (Cycle Engineers
Institute) or BSC (British
Standard Cycle)
Bob
55 BN1 and Whitworth equipped Motorcycles. Triumph, BSA, Norton,
Matchless, Royal Enfield
Curt/Nancy Arndt wrote:
> Bob,
>
> Whitworth in that I beleive they are BSPP (British Standard Pipe Parallel.)
>
>
> Remember there are five different Whitworth thread forms, i.e. BSW, BSF,
> BSPP, BSPT, and BSB (British Standard Brass.)
>
> British Standard Fine is the most common on the 100s, followed by Bripish
> Standard Pipe Parallel, and a few British standard Whitworth.
>
> Cheers,
>
> Curt
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