[Healeys] Speedo Drive Thread Size?

[Bob Haskell]

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 at gmail.com>
> *Sent: *Sunday, August 8, 2021 12:33 PM
> *To: *Hank Leach <mailto:gradea1 at charter.net>
> *Cc: *Harold Manifold <mailto:manifold at telus.net>; 
> healeys at autox.team.net <mailto:healeys at 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 at autox.team.net <mailto:healeys at 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
>     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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