Subject: [Healeys] One for the thread guys

From: Michael Salter <[email-masked]>
Date: Sun, 2 Jun 2024 10:25:48 -0400

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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.
Is this some sort of standard thread or a "special"?

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<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&quot; diameter and 16 TPI.<div dir="auto">Is this some sort of standard thread or a &quot;special&quot;?</div></div>

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From: Hank Leach via Healeys <[email-masked]>
Date: Sun, 02 Jun 2024 16:40:23 +0000 qoy1Ck0PIq+vxauE4MzSH0oWLNqNXt2WUzSVKKwzXcBIPNgAscf3pIsKc2VDin/CrfAWWQDCXj0PHjgc1yRSlUCbfQ9Q/Pn31vkCuPR5lwjiPsHhoE0v7thA yOipS9MxxxTOdbrEIfsb9w==

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<div>I always thought it to be BSP (British Pipe thread) but that is 14 TPI=
 and 55 degrees angle.&nbsp; Metric is 60 degrees and NPT measures the =
outside diameter to determine size so it is all very confusing. I have some=
 British HSS dies which are also quite different but as Harold mentions the=
 thread angle may be the clue to what they are. There must be a taper to be=
 true pipe fittings. Don't know about Coventry Radiador, but SU was a =
plumbing group (Skinners Union). All charts with dimensions are on internet=
. Hank<br>-------------------- <br><br>From: "Harold Manifold" =
&lt;[email-masked]&gt; <br>To: "Michael Salter" &lt;michaelsalter@gmail=
.com&gt; <br>Cc: &lt;[email-masked]&gt; <br>Sent: June 2, 2024 at =
9:15 AM PDT <br>Subject: Re: [Healeys] One for the thread guys </div>
<div>Michael,
<div>&nbsp;</div>
<div>It might be from the 16-UN series of =
threads. Definitely&nbsp;in the "special" category. What a surprise! Are =
you able to measure the thread angle? The 16-UN series is 60 degrees.</div>
<div>&nbsp;</div>
<div><img style=3D"margin-right: 0px;" =
src=3D"data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/4QL6RXhpZgAATU0AK=
Af/2Q=3D=3D" alt=3D"16-UN.JPG" width=3D"562" height=3D"490"></div>
<div>Harold</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
</div>
<div>&nbsp;</div>
<div class=3D"gmail_quote">
<div class=3D"gmail_attr">On =
Sun, Jun 2, 2024 at 7:32=E2=80=AFAM Michael Salter &lt;<a =
href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px=
 0.8ex; border-left: 1px solid rgb(204,204,204); padding-left: 1ex;">
<div>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>Is this some sort of standard thread or a "special"?</div>
</div>
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<div>&nbsp;</div>

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