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However the “UN” denotes a unified thread which is the same as SAE.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> WILLIAM B LAWRENCE <ynotink@msn.com><br>
<b>Sent:</b> Sunday, June 2, 2024 7:55 PM<br>
<b>To:</b> John Spaur via Healeys <healeys@autox.team.net>; 'Michael Salter' <michaelsalter@gmail.com>; 'Mirek Sharp' <m.g.sharp@sympatico.ca>; John Spaur <jmsdarch@sbcglobal.net><br>
<b>Subject:</b> Re: [Healeys] One for the thread guys</font>
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I believe the “S” denotes a straight thread as opposed to tapered.</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Healeys <healeys-bounces@autox.team.net> on behalf of John Spaur via Healeys <healeys@autox.team.net><br>
<b>Sent:</b> Sunday, June 2, 2024 7:13 PM<br>
<b>To:</b> 'Michael Salter' <michaelsalter@gmail.com>; 'Mirek Sharp' <m.g.sharp@sympatico.ca><br>
<b>Cc:</b> healeys@autox.team.net <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] One for the thread guys</font>
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<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">When I rebuilt the engine in my 1962 BT7 I cleaned the threads with a 9/16-18NF tap. When I reinstalled the bulb I used Hylomar, possibly the hardening
type, to seal the threads. No leaks.</span></p>
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D">John</span></p>
<p class="x_x_MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri",sans-serif; color:#1F497D"> </span></p>
<p class="x_x_MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Healeys [mailto:healeys-bounces@autox.team.net]
<b>On Behalf Of </b>Michael Salter<br>
<b>Sent:</b> Sunday, June 2, 2024 10:42 AM<br>
<b>To:</b> Mirek Sharp <m.g.sharp@sympatico.ca><br>
<b>Cc:</b> healeys@autox.team.net<br>
<b>Subject:</b> Re: [Healeys] One for the thread guys</span></p>
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<p class="x_x_MsoNormal">I don't have a 55 degree 16 TPI thread gauge but my 60 degree seems to be a very good fit.</p>
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<p class="x_x_MsoNormal">On Sun., Jun. 2, 2024, 12:45 p.m. , <<a href="mailto:m.g.sharp@sympatico.ca">m.g.sharp@sympatico.ca</a>> wrote:</p>
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<p class="x_x_MsoNormal" style=""><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">Bit of a stumper Mike. Tracy tools, my go-to source for taps and dies, sell a tap that is 5/8”x16 with a “UNS” thread form
<a href="https://www.tracytools.com/product/5-8-x-16-tpi" target="_blank">https://www.tracytools.com/product/5-8-x-16-tpi</a></span><span lang="EN-CA"></span></p>
<p class="x_x_MsoNormal" style=""><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif">I am unfamiliar with UNS but believe it is the abbreviation for Unified National Special, suggesting it is non-standard thread. Looks like a bit
of a rabbit hole and I am curious to see what others find.</span><span lang="EN-CA"></span></p>
<p class="x_x_MsoNormal" style=""><span lang="EN-CA" style="font-size:11.0pt; font-family:"Calibri",sans-serif"> </span><span lang="EN-CA"></span></p>
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<p class="x_x_MsoNormal" style=""><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Healeys <<a href="mailto:healeys-bounces@autox.team.net" target="_blank">healeys-bounces@autox.team.net</a>>
<b>On Behalf Of </b>Michael Salter<br>
<b>Sent:</b> Sunday, June 2, 2024 10:26 AM<br>
<b>To:</b> <a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a><br>
<b>Subject:</b> [Healeys] One for the thread guys</span><span lang="EN-CA"></span></p>
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<p class="x_x_MsoNormal" style=""><span lang="EN-CA"> </span></p>
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<p class="x_x_MsoNormal" style=""><span lang="EN-CA">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.</span></p>
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<p class="x_x_MsoNormal" style=""><span lang="EN-CA">Is this some sort of standard thread or a "special"?</span></p>
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