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<p>Hi Mike<br>
</p>
<p>Hybrid nuts and bolts even exist in UNF/UNC thread with metric AF
spanner sizes. Probably the same for some UK thread patterns. I do
not mean sizes that fit metric tools but deliberately made that
way. I suppose it may have been caused by manufacturing USA and US
products in "metric countries", e.g. Farmall tractors produced in
France. You won't find these in any books/tables.<br>
</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 5-6-2020 om 15:00 schreef Michael
MacLean:<br>
</div>
<blockquote type="cite"
cite="mid:1222118630.3202848.1591362010548@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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>
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<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><a class="moz-txt-link-rfc2396E" href="mailto:coudesluijs@chello.nl"><coudesluijs@chello.nl></a> wrote:</div>
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