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Richard,
Great question. and an easy one to answer.
The British Standards [the ONLY official source] state explicitly that the
definition of a Whitworth fastener is one that has a 55 degree thread pitch
angle versus the 60 degrees of UNF/UNC, ANF/ANC, and SAE fine and
coarse and the 47-1/2 degree thread pitch of BA - British Association.
Whitworth IS NOT defined and a fastener that uses a Whitworth sized hex
head as both BSC British Standard Cycle and CEI Cycle Engineers Institute
have these heads and use whitworth spanners BUT also have threads with a 60
degree pitch angle... *hence NOT whitworth!!! *Where does the BS [not
British Standard] come from? Wikipedia, which is wrong on this subject,
something I've tried to correct for two decades to no avail!
The five most common whitworth fasteners [yes, there are more] used on
Austin Healeys are... BSF - British Standard Fine, BSW - British Standard
Whitworth, BSPP - British Standard Pipe Parallel, BSPT - British Standard
Pipe Tapered and BSB - British Standard Brass. ALL have a 55 degree thread
pitch angle. Discussion over, and anyone who says otherwise in WRONG! Not
my opinion, just the facts as set forth by the British Standards, so
irrefutable.
Rant over.
Curt Arndt
The fastener authority for the Concours Registry.
On Tue, May 23, 2023 at 12:01=E2=80=AFPM Ricchardd Mayor <boyracer466@gmail=
.com>
wrote:
> I have a question for you all regarding Whitworth (55* thread pitch angle=
)
> fasteners. I have generally referred to both BSW and BSF as Whitworth
> fasteners. But, I have been =E2=80=9Ccorrected=E2=80=9D a number of times=
over this last
> year by some that say BSF is not Whitworth. So, is BSF Whitworth, or is =
it
> not?
>
>
> Richard Mayor
> boyracer466@gmail.com
>
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<div dir=3D"ltr"><div>Richard,</div><div><br></div><div>Great question. and=
an easy one to answer.=C2=A0</div><div><br></div><div>The British Standard=
s [the ONLY=C2=A0official source] state=C2=A0explicitly that the definition=
of a Whitworth fastener is one that has a 55 degree thread pitch angle ver=
sus the 60 degrees of UNF/UNC, ANF/ANC, and SAE fine and coarse=C2=A0and th=
e 47-1/2 degree thread pitch of BA - British=C2=A0Association.=C2=A0</div><=
div><br></div><div>Whitworth=C2=A0IS NOT defined and a fastener that uses a=
Whitworth sized hex head as both BSC British Standard Cycle and CEI Cycle =
Engineers Institute have these heads and use whitworth spanners BUT also ha=
ve threads with a 60 degree pitch angle...=C2=A0<b><font size=3D"4">hence N=
OT whitworth!!!=C2=A0</font></b>Where does the BS [not British Standard] co=
me from? Wikipedia, which is wrong on this subject, something I've=C2=
=A0tried to correct for two decades to no avail!</div><div><br></div><div>T=
he five most common whitworth fasteners=C2=A0[yes, there are more] used on =
Austin Healeys are... BSF - British Standard Fine, BSW - British Standard W=
hitworth, BSPP - British Standard Pipe Parallel, BSPT - British Standard Pi=
pe Tapered and BSB - British Standard Brass. ALL have a 55 degree thread pi=
tch angle. Discussion over, and anyone who says otherwise=C2=A0in WRONG! No=
t my opinion, just the facts as set forth by the British Standards, so irre=
futable.</div><div><br></div><div>Rant over.</div><div><br></div><div>Curt =
Arndt</div><div>The fastener authority=C2=A0for the Concours Registry.</div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tu=
e, May 23, 2023 at 12:01=E2=80=AFPM Ricchardd Mayor <<a href=3D"mailto:b=
oyracer466@gmail.com">boyracer466@gmail.com</a>> wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex"><div style=3D"overflow-wrap: bre=
ak-word;">I have a question for you all regarding Whitworth (55* thread pit=
ch angle) fasteners.=C2=A0 I have generally referred to both BSW and BSF as=
Whitworth fasteners. But, I have been =E2=80=9Ccorrected=E2=80=9D a number=
of times over this last year by some that say BSF is not Whitworth.=C2=A0 =
So, is BSF Whitworth, or is it not?=C2=A0<div><br></div><div><br><div>
Richard=C2=A0Mayor<br><a href=3D"mailto:boyracer466@gmail.com"; target=3D"_b=
lank">boyracer466@gmail.com</a><br></div></div></div></blockquote></div></d=
iv>
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