<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Thank you Curt for that explanation. <div class=""><br class=""></div><div class="">Richard<br class=""><div class=""><br class=""></div><div class=""><br class=""><div apple-content-edited="true" class="">
Richard Mayor<br class=""><a href="mailto:boyracer466@gmail.com" class="">boyracer466@gmail.com</a><br class=""><br class="">
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<br class=""><div><blockquote type="cite" class=""><div class="">On May 23, 2023, at 12:28 PM, Curtis Arndt <<a href="mailto:cnaarndt@gmail.com" class="">cnaarndt@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class="">Richard,</div><div class=""><br class=""></div><div class="">Great question. and an easy one to answer. </div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">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... <b class=""><font size="4" class="">hence NOT whitworth!!! </font></b>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!</div><div class=""><br class=""></div><div class="">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.</div><div class=""><br class=""></div><div class="">Rant over.</div><div class=""><br class=""></div><div class="">Curt Arndt</div><div class="">The fastener authority for the Concours Registry.</div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 23, 2023 at 12:01 PM Ricchardd Mayor <<a href="mailto:boyracer466@gmail.com" class="">boyracer466@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class="">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? <div class=""><br class=""></div><div class=""><br class=""><div class="">
Richard Mayor<br class=""><a href="mailto:boyracer466@gmail.com" target="_blank" class="">boyracer466@gmail.com</a><br class=""></div></div></div></blockquote></div></div>
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