[Healeys] Instrument clamp nuts

[Michael Salter]

Good point Alan, it is not at all unlikely that some of the ones I have are
from other and later models.

M

On Tue, May 5, 2026 at 11:50 AM Alan Seigrist <healey.nut at gmail.com> wrote:

> 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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