[Healeys] Speedo Drive Thread Size?

[john harper]

Harold

I can confirm that in my documents there is a section British Standard
Cycle thread. Diameters are from 1/8" to 3/4", the largest. TPI is from 40
thru 26. It is a 60-degree form rounded on top and inside.

It first became a recognized standard in 1902

Best regards

On Sun, 8 Aug 2021 at 18:45, Henry G Leach via Healeys <
healeys at autox.team.net> wrote:

> Harold-you can get these parts at: https://britishfasteners.com/
>
> They have all the British sizes and tools to boot including BSC!  Hank
>
> -----------------------------------------
> From: "Harold Manifold via Healeys"
> To: "Ken Fleming via Healeys"
> Cc:
> Sent: Sunday August 8 2021 9:27:29AM
> Subject: [Healeys] Speedo Drive Thread Size?
>
> Just when I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, etc.
> along comes BSC (British Standard Cycle). The threads on the transmission
> speedo drive and the angle drive are not the best and could use a
> refreshed. The pitch is 26 TPI and the diameter is ¾” as best I can
> measure. After searching Google the closest match I could find is 3/4" X 26
> TPI BSC.
>
>
>
> I have never heard of British Standard Cycle before. Can anyone confirm if
> this is the tread size?
>
>
>
> Harold
>
>
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