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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=E2=80=AFPM Hank Leach via Healeys <
healeys@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 it=
s
> part 361-035 so they are different than earlier instrument parts. Could b=
e
> 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 an=
d
> 3000 (BJ8) Hank
>
> --------------------
>
> From: "Michael Salter" <michaelsalter@gmail.com>
> To: <healeys@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 wi=
ll
> 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 an=
d
> other then 3BA what is the other thread.
>
> M
>
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<div dir=3D"ltr">Ive had similar issues with oddball knurled nuts here and =
there in the past.=C2=A0 I wonder if later MGBs and Triumphs had SAE thread=
ed guages... might be the explaination</div><br><div class=3D"gmail_quote g=
mail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 30,=
2026 at 9:54=E2=80=AFPM Hank Leach via Healeys <<a href=3D"mailto:heale=
ys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px =
solid rgb(204,204,204);padding-left:1ex"><div>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 thr=
eads so it is not Unified.</div>
<div>=C2=A0</div>
<div>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. Coul=
d be just the knurling as the BJs are fine knurls and others might be coars=
er. My thought is that all of them are/sb 3BA. Here are pics of 100. 100-6 =
and 3000 (BJ8) Hank</div>
<div><br>-------------------- <br><br>From: "Michael Salter" <=
<a href=3D"mailto:michaelsalter@gmail.com"; target=3D"_blank">michaelsalter@=
gmail.com</a>> <br>To: <<a href=3D"mailto:healeys@autox.team.net"; tar=
get=3D"_blank">healeys@autox.team.net</a>> <br>Sent: April 29, 2026 at 8=
:33 AM PDT <br>Subject: [Healeys] Instrument clamp nuts </div>
<div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">I have a collection of instrument retaining clamps and nuts but am=
confused about the different threads on those nuts.</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">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 an=
d will only go onto most of the instruments a turn or 2 before jamming.=C2=
=A0</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">Does anyone know if there is more than one thread used for these s=
tuds and other then 3BA what is the other thread.</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">=C2=A0</div>
<div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-siz=
e:small">M</div>
</div>
<div>=C2=A0</div>_______________________________________________<br>
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</blockquote></div>
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