Harold,
As has been pointed out in separate emails, there are two standards that
include 3/4" dia with 26 TPI. British Standard Cycle with thread angle
of 60 degrees and British Standard Brass with a thread angle of 55
degrees. Since the speedo drive is brass I would suspect the latter,
but I don't have one handy to check.
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar
On 8/8/21 7:33 PM, Harold Manifold via Healeys wrote:
>
> Thanks for all your replies. I will add BSC to my fastener list. I
> will see if I can locate a die.
>
> Harold
>
> *From: *john harper <mailto:ah100tech@gmail.com>
> *Sent: *Sunday, August 8, 2021 12:33 PM
> *To: *Hank Leach <mailto:gradea1@charter.net>
> *Cc: *Harold Manifold <mailto:manifold@telus.net>;
> healeys@autox.team.net <mailto:healeys@autox.team.net>
> *Subject: *Re: [Healeys] Speedo Drive Thread Size?
>
> 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@autox.team.net <mailto:healeys@autox.team.net>> wrote:
>
> Harold-you can get these parts at: https://britishfasteners.com/
> <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
> ¾â?? 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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