[Healeys] Exhaust hangers

[Curtis Arndt]

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 PM Ricchardd Mayor <boyracer466 at 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 “corrected” 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 at gmail.com
>
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