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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>I read that it is a 5/8 bolt, so I am a little uncertain now. The last time I replaced the bulb was 11 years ago. Also, I don’t recall that there was a copper washer which would be needed. Could it be a pipe thread?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=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'> WILLIAM B LAWRENCE [mailto:ynotink@msn.com] <br><b>Sent:</b> Sunday, June 2, 2024 12:58 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<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-family:"inherit",serif'>However the “UN” denotes a unified thread which is the same as SAE.<o:p></o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="98%" align=center></div><div id=divRplyFwdMsg><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:black'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:black'> WILLIAM B LAWRENCE <<a href="mailto:ynotink@msn.com">ynotink@msn.com</a>><br><b>Sent:</b> Sunday, June 2, 2024 7:55 PM<br><b>To:</b> John Spaur via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>>; 'Michael Salter' <<a href="mailto:michaelsalter@gmail.com">michaelsalter@gmail.com</a>>; 'Mirek Sharp' <<a href="mailto:m.g.sharp@sympatico.ca">m.g.sharp@sympatico.ca</a>>; John Spaur <<a href="mailto:jmsdarch@sbcglobal.net">jmsdarch@sbcglobal.net</a>><br><b>Subject:</b> Re: [Healeys] One for the thread guys</span> <o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-family:"inherit",serif'>I believe the “S” denotes a straight thread as opposed to tapered.<o:p></o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="98%" align=center></div><div id="x_divRplyFwdMsg"><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:black'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:black'> Healeys <<a href="mailto:healeys-bounces@autox.team.net">healeys-bounces@autox.team.net</a>> on behalf of John Spaur via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>><br><b>Sent:</b> Sunday, June 2, 2024 7:13 PM<br><b>To:</b> 'Michael Salter' <<a href="mailto:michaelsalter@gmail.com">michaelsalter@gmail.com</a>>; 'Mirek Sharp' <<a href="mailto:m.g.sharp@sympatico.ca">m.g.sharp@sympatico.ca</a>><br><b>Cc:</b> <a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a> <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>><br><b>Subject:</b> Re: [Healeys] One for the thread guys</span> <o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><div><p class=xxmsonormal><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><o:p></o:p></p><p class=xxmsonormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p><p class=xxmsonormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>John</span><o:p></o:p></p><p class=xxmsonormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p><p class=xxmsonormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:110.0pt;font-family:"Calibri",sans-serif'> Healeys [<a href="mailto:healeys-bounces@autox.team.net">mailto:healeys-bounces@autox.team.net</a>] <b>On Behalf Of </b>Michael Salter<br><b>Sent:</b> Sunday, June 2, 2024 10:42 AM<br><b>To:</b> Mirek Sharp <<a href="mailto:m.g.sharp@sympatico.ca">m.g.sharp@sympatico.ca</a>><br><b>Cc:</b> <a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a><br><b>Subject:</b> Re: [Healeys] One for the thread guys</span><o:p></o:p></p><p class=xxmsonormal> <o:p></o:p></p><div><p class=xxmsonormal>I don't have a 55 degree 16 TPI thread gauge but my 60 degree seems to be a very good fit.<o:p></o:p></p></div><p class=xxmsonormal> <o:p></o:p></p><div><div><p class=xxmsonormal>On Sun., Jun. 2, 2024, 12:45 p.m. , <<a href="mailto:m.g.sharp@sympatico.ca">m.g.sharp@sympatico.ca</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><div><p class=xxmsonormal><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><o:p></o:p></p><p class=xxmsonormal><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><o:p></o:p></p><p class=xxmsonormal><span lang=EN-CA style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=xxmsonormal><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><o:p></o:p></p></div><p class=xxmsonormal><span lang=EN-CA> </span><o:p></o:p></p><div><p class=xxmsonormal><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><o:p></o:p></p><div><p class=xxmsonormal><span lang=EN-CA>Is this some sort of standard thread or a "special"?</span><o:p></o:p></p></div></div></div></div></blockquote></div></div></div></div></div></body></html>