[Healeys] Instrument clamp nuts

[simon.lachlan at alexarevel.plus.com]

Maybe contact a supplier/calibration place like Speedycables for advice?

Simon

 

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Michael Salter
Sent: 05 May 2026 16:52
To: Alan Seigrist <healey.nut at gmail.com>
Cc: healeys at autox.team.net
Subject: Re: [Healeys] Instrument clamp nuts

 

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 <mailto: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 <mailto: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 <mailto:michaelsalter at gmail.com> > 
To: <healeys at autox.team.net <mailto: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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