Kees, <div id="yMail_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="yMail_cursorElementTracker_1591361992013">Mike MacLean<br><br><div id="ymail_android_signature"><a id="ymail_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">Sent from AT&T Yahoo Mail on Android</a></div> <br> <blockquote style="margin: 0 0 20px 0;"> <div style="font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Fri, Jun 5, 2020 at 3:33 AM, Kees Oudesluijs</div><div><coudesluijs@chello.nl> wrote:</div> </div> <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> _______________________________________________<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" ymailto="mailto:Healeys@autox.team.net" href="mailto:Healeys@autox.team.net">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>