[Healeys] Exhaust hangers

[Ricchardd Mayor]

Thank you Curt for that explanation.  

Richard


Richard Mayor
boyracer466 at gmail.com


> On May 23, 2023, at 12:28 PM, Curtis Arndt <cnaarndt at gmail.com> wrote:
> 
> 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 <mailto: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 <mailto:boyracer466 at gmail.com>

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