<div dir="ltr">Mike<div><br></div><div>Just as a matter of interest; early Whitworth fasteners like nuts and bolts heads were originally larger than is the general  case today</div><div><br></div><div>They were one size different so for example on a spanner you will see markings like 1W/4 and 5/16 BSF. on the same end.</div><div><br></div><div>Best regards</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, 5 Jun 2020 at 14:04, Michael MacLean <<a href="mailto:rrengineer.mike@att.net">rrengineer.mike@att.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Kees, <div id="gmail-m_-8382441617740887944yMail_cursorElementTracker_1591361637003">     I know the difference.  I have a degree in mechanical design and have worked as an aerospace fastener designer.  The threads in both nuts were exactly the same BSF thread.  The only difference was the distance across flats were BSF/Whitworth on one set of nuts and SAE across flats distance wise on the other set.  That is what surprised me.  I did not know hybrid fasteners even existed, but both sets were sold as fastener sets for 100-4 pedestal studs.</div><div id="gmail-m_-8382441617740887944yMail_cursorElementTracker_1591361992013">Mike MacLean<br><br><div id="gmail-m_-8382441617740887944ymail_android_signature"><a id="gmail-m_-8382441617740887944ymail_android_signature_link" href="https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature" target="_blank">Sent from AT&T Yahoo Mail on Android</a></div> <br> <blockquote style="margin:0px 0px 20px"> <div style="font-family:Roboto,sans-serif;color:rgb(109,0,246)"> <div>On Fri, Jun 5, 2020 at 3:33 AM, Kees Oudesluijs</div><div><<a href="mailto:coudesluijs@chello.nl" target="_blank">coudesluijs@chello.nl</a>> wrote:</div> </div> <div style="padding:10px 0px 0px 20px;margin:10px 0px 0px;border-left:1px solid rgb(109,0,246)"> _______________________________________________<br clear="none">Support Team.Net <a shape="rect" href="http://www.team.net/donate.html" target="_blank">http://www.team.net/donate.html</a><br clear="none">Suggested annual donation  $12.75<br clear="none"><br clear="none">Archive: <a shape="rect" href="http://www.team.net/pipermail/healeys" target="_blank">http://www.team.net/pipermail/healeys </a><a shape="rect" href="http://autox.team.net/archive" target="_blank">http://autox.team.net/archive</a><br clear="none"><br clear="none"><a shape="rect" href="mailto:Healeys@autox.team.net" target="_blank">Healeys@autox.team.net</a><br clear="none"><a shape="rect" href="http://autox.team.net/mailman/listinfo/healeys" target="_blank">http://autox.team.net/mailman/listinfo/healeys</a><br clear="none"><br clear="none">Unsubscribe/Manage: <a shape="rect" href="http://autox.team.net/mailman/options/healeys/rrengineer.mike@att.net" target="_blank">http://autox.team.net/mailman/options/healeys/rrengineer.mike@att.net</a><br clear="none"><br clear="none"> </div> </blockquote></div>_______________________________________________<br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Best wishes<div><br></div><div>John Harper</div><div><br></div><div>AHC UK 100 Register Secretary</div></div></div>