[Healeys] Instrument clamp nuts

[Alan Seigrist]

Ive had similar issues with oddball knurled nuts here and there in the
past.  I wonder if later MGBs and Triumphs had SAE threaded guages... might
be the explaination

On Thu, Apr 30, 2026 at 9:54 PM Hank Leach via Healeys <
healeys at autox.team.net> wrote:

> Michael-unfortunately the 100 parts book does not address the instruments.
> The later parts books do and for the BJ8 the nuts are 17H1304. I just
> looked at a NOS speedo I have for the BJ8 and the thread is close to 8-32
> but it only goes on a couple of threads so it is not Unified.
>
> Moss catalog calls for the nuts 300-370 for BN1 to BJ7 and for the BJ8 its
> part 361-035 so they are different than earlier instrument parts. Could be
> just the knurling as the BJs are fine knurls and others might be coarser.
> My thought is that all of them are/sb 3BA. Here are pics of 100. 100-6 and
> 3000 (BJ8) Hank
>
> --------------------
>
> From: "Michael Salter" <michaelsalter at gmail.com>
> To: <healeys at autox.team.net>
> Sent: April 29, 2026 at 8:33 AM PDT
> Subject: [Healeys] Instrument clamp nuts
> I have a collection of instrument retaining clamps and nuts but am
> confused about the different threads on those nuts.
> As far as I can find the thread on the studs on the Smiths/Jaeger is 3BA
> however, I have several nuts (these are the round ones with various sorts
> of knurling on the periphery) that seem to have a different thread and will
> only go onto most of the instruments a turn or 2 before jamming.
> Does anyone know if there is more than one thread used for these studs and
> other then 3BA what is the other thread.
>
> M
>
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