Subject: Re: [Healeys] British Tool and Fasteners - Misrepresention

From: Alan Seigrist <[email-masked]>
Date: Tue, 28 Mar 2023 08:09:18 +0800

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Hi Richard -

The 16 written on the blade means the Threads Per Inch, which will always
be the same regardless of the pitch angle.  So in this case, a 3/8"
Whitworth bolt will be 55 deg w/ 16 TPI,  and a 3/8" UNC bolt will be 60
deg w/ 16 TPI.  So when you put the sawtooth together like this, it will
mesh.

That said, the tooth shape is a little different so if you hold that up to
the light you will see gaps between the sawtooth.  This is how you can tell
with a thread guage if it is UNC or BSW, hold the bolt and sawtooth to the
light and if you see gaps in the thread, its not a match, even if it does
mesh together.

Best,

Alan

On Tue, Mar 28, 2023 at 4:48=E2=80=AFAM richard mayor <[email-masked]=
m> wrote:

> Just bought a =E2=80=9CWhitworth" thread pitch gauge from British Tool be=
cause
> I=E2=80=99ve begun to restore a BN1 and I need to confirm the 55 degree t=
hread
> pitch angle on the Whitworth bolts.
>
> It turns out that British Tool and Fasteners thread pitch gauge is not
> actually Whitworth, even though they say it is. And even though the owner=
,
> Jon Caswell, knows it is not the 55 degree angle that it is represented t=
o
> be, he seems to think that is OK and doesn=E2=80=99t think he should reim=
burse me
> for any of the shipping, even one way.
>
> Check out these photos comparing an American pitch gauge, 60 degree angle=
,
> to his =E2=80=9CWhitworth=E2=80=9D 55 degree angle guage.
>
> Richard Mayor
> [email-masked]
>
>
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<div dir=3D"ltr">Hi Richard -<div><br></div><div>The 16 written on the blad=
e means the Threads Per Inch, which will always be the same regardless of t=
he pitch angle.=C2=A0 So in this case, a 3/8&quot; Whitworth bolt will be 5=
5 deg w/ 16 TPI,=C2=A0 and a 3/8&quot; UNC bolt will be 60 deg w/ 16 TPI.=
=C2=A0 So when you put the sawtooth together like this, it will mesh.=C2=A0=
=C2=A0<br><br>That said, the tooth shape is a little different so if you ho=
ld that up to the light you will see gaps between the sawtooth.=C2=A0 This =
is how you can tell with a thread guage=C2=A0if it is UNC or BSW, hold the =
bolt and sawtooth to the light and if you see gaps in the thread, its not a=
 match, even if it does mesh together.<br><br>Best,<br><br>Alan<br><br><br>=
</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_=
attr">On Tue, Mar 28, 2023 at 4:48=E2=80=AFAM richard mayor &lt;<a href=3D"=
mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border=
-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Just bought a =E2=
=80=9CWhitworth&quot; thread pitch gauge from British Tool because I=E2=80=
=99ve begun to restore a BN1 and I need to confirm the 55 degree thread pit=
ch angle on the Whitworth bolts.<div><br></div><div>It turns out that Briti=
sh Tool and Fasteners thread pitch gauge is not actually Whitworth, even th=
ough they say it is. And even though the owner, Jon Caswell, knows it is no=
t the 55 degree angle that it is represented to be, he seems to think that =
is OK and doesn=E2=80=99t think he should reimburse me for any of the shipp=
ing, even one way.</div><div><br></div><div>Check out these photos comparin=
g an American pitch gauge, 60 degree angle, to his =E2=80=9CWhitworth=E2=80=
=9D 55 degree angle guage.=C2=A0</div><div>=C2=A0=C2=A0</div><div><div>
<div>Richard Mayor</div><div><a href=3D"mailto:[email-masked]" targe=
t=3D"_blank">[email-masked]</a></div><div><br></div><br>

</div>

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From: Alan Seigrist via Healeys <[email-masked]>
Date: Tue, 28 Mar 2023 14:13:21 +0800

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Richard -

Incidentally, there is only one Whitworth bolt on a BN1 as far as I'm aware
- on the Dynamo adjustment bracket.

Bolts and nuts on a BN1 are generally easy to identify  - anything on the
drivetrain will be BSF, and anything on the chassis will be UNF (SAE
Fine).

Anything on the carbs or instruments will be BA, except for the fuel line
which generally BSP (if I am not mistaken).

Best,

Alan

On Tue, Mar 28, 2023 at 8:09=E2=80=AFAM Alan Seigrist <[email-masked]=
> wrote:

> That said, the tooth shape is a little different so if you hold that up t=
o
> the light you will see gaps between the sawtooth.  This is how you can te=
ll
> with a thread guage if it is UNC or BSW, hold the bolt and sawtooth to th=
e
> On Tue, Mar 28, 2023 at 4:48=E2=80=AFAM richard mayor <boyracer466@gmail.=
com>
> wrote:
>
>> Just bought a =E2=80=9CWhitworth" thread pitch gauge from British Tool b=
ecause
>> I=E2=80=99ve begun to restore a BN1 and I need to confirm the 55 degree =
thread
>> actually Whitworth, even though they say it is. And even though the owne=
r,
>> Jon Caswell, knows it is not the 55 degree angle that it is represented =
to
>> be, he seems to think that is OK and doesn=E2=80=99t think he should rei=
mburse me
>> Check out these photos comparing an American pitch gauge, 60 degree
>> angle, to his =E2=80=9CWhitworth=E2=80=9D 55 degree angle guage.
>>
>> Richard Mayor
>> [email-masked]
>>
>>

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<div dir=3D"ltr">Richard -<div><br></div><div>Incidentally, there is only o=
ne Whitworth bolt on a BN1 as far as I&#39;m aware - on the Dynamo adjustme=
nt bracket.=C2=A0<br><br>Bolts and nuts on a BN1 are generally easy to iden=
tify=C2=A0 - anything on the drivetrain will be BSF, and anything on the ch=
assis will be UNF (SAE Fine).=C2=A0 <br><br>Anything on the carbs or instru=
ments will be BA, except for the fuel line which generally BSP (if I am not=
 mistaken).<br><br>Best,<br><br>Alan</div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Mar 28, 2023 at 8:09=E2=
=80=AFAM Alan Seigrist &lt;<a href=3D"mailto:[email-masked]">healey.n=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex"><div dir=3D"ltr">Hi Richard -<div><br></div><div>The 16 written=
 on the blade means the Threads Per Inch, which will always be the same reg=
ardless of the pitch angle.=C2=A0 So in this case, a 3/8&quot; Whitworth bo=
lt will be 55 deg w/ 16 TPI,=C2=A0 and a 3/8&quot; UNC bolt will be 60 deg =
w/ 16 TPI.=C2=A0 So when you put the sawtooth together like this, it will m=
esh.=C2=A0=C2=A0<br><br>That said, the tooth shape is a little different so=
 if you hold that up to the light you will see gaps between the sawtooth.=
=C2=A0 This is how you can tell with a thread guage=C2=A0if it is UNC or BS=
W, hold the bolt and sawtooth to the light and if you see gaps in the threa=
d, its not a match, even if it does mesh together.<br><br>Best,<br><br>Alan=
<br><br><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cla=
ss=3D"gmail_attr">On Tue, Mar 28, 2023 at 4:48=E2=80=AFAM richard mayor &lt=
;<a href=3D"mailto:[email-masked]" target=3D"_blank">boyracer466@gma=
il.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex"><div>Just bought a =E2=80=9CWhitworth&quot; thread pitch gauge from B=
ritish Tool because I=E2=80=99ve begun to restore a BN1 and I need to confi=
rm the 55 degree thread pitch angle on the Whitworth bolts.<div><br></div><=
div>It turns out that British Tool and Fasteners thread pitch gauge is not =
actually Whitworth, even though they say it is. And even though the owner, =
Jon Caswell, knows it is not the 55 degree angle that it is represented to =
be, he seems to think that is OK and doesn=E2=80=99t think he should reimbu=
rse me for any of the shipping, even one way.</div><div><br></div><div>Chec=
k out these photos comparing an American pitch gauge, 60 degree angle, to h=
is =E2=80=9CWhitworth=E2=80=9D 55 degree angle guage.=C2=A0</div><div>=C2=
=A0=C2=A0</div><div><div>
<div>Richard Mayor</div><div><a href=3D"mailto:[email-masked]" targe=
t=3D"_blank">[email-masked]</a></div><div><br></div><br>

</div>

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[email-masked]

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