<div dir="ltr">Michael,<div><br></div><div>It might be from the 16-UN series of threads. Definitely in the "special" category. What a surprise! Are you able to measure the thread angle? The 16-UN series is 60 degrees.</div><div><br></div><div><img src="cid:ii_lwxq2z8p0" alt="16-UN.JPG" width="562" height="490" style="margin-right: 0px;"><br></div><div>Harold</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jun 2, 2024 at 7:32 AM Michael Salter <<a href="mailto:michaelsalter@gmail.com">michaelsalter@gmail.com</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"><div dir="auto">The thread on the flare nut used to secure the temperature bulb into the head on later 6 cylinder engines is 5/8" diameter and 16 TPI.<div dir="auto">Is this some sort of standard thread or a "special"?</div></div>
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