Subject: [Tigers] oil gauge block adaptor

From: "Ron Fraser" <[email-masked]>
Date: Sun, 4 Jul 2021 12:02:11 -0400

This is a multipart message in MIME format.

--===============8025164404799948641==
	boundary="----=_NextPart_000_000F_01D770CC.6C67CBE0"
Content-Language: en-us

This is a multipart message in MIME format.

------=_NextPart_000_000F_01D770CC.6C67CBE0
	charset="utf-8"
Content-Transfer-Encoding: quoted-printable

Terry

                I did some more digging and I find there is a difference =
in the number of threads per inch.

=20

NPTF

1/8=E2=80=9D       27 threads/ inch

=C2=BC=E2=80=9D           18

=20

BSPT

1/8=E2=80=9D       28 threads/ inch

=C2=BC=E2=80=9D           19

=20

So these 2 systems have threads that are not totally compatible or =
interchangeable.=20

=20

I believe the tubing end of the adaptor is parallel thread.

The threads per inch is the same for either system tapered or parallel.

=20

I would suggest measuring the part accurately is the only way to know =
for sure.

=20

Ron Fraser

=20

=20

------=_NextPart_000_000F_01D770CC.6C67CBE0
	charset="utf-8"
Content-Transfer-Encoding: quoted-printable

<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta =
http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta =
name=3DGenerator content=3D"Microsoft Word 15 (filtered =
medium)"><style><!--
/* Font Definitions */
@font-face
	{font-family:"Cambria Math";
	panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
	{font-family:Calibri;
	panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
	{margin:0in;
	margin-bottom:.0001pt;
	font-size:11.0pt;
	font-family:"Calibri",sans-serif;
	color:black;}
span.EmailStyle18
	{mso-style-type:personal-reply;
	font-family:"Calibri",sans-serif;
	color:windowtext;}
.MsoChpDefault
	{mso-style-type:export-only;
	font-size:10.0pt;}
@page WordSection1
	{size:8.5in 11.0in;
	margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
	{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body bgcolor=3Dwhite =
lang=3DEN-US link=3Dblue vlink=3Dpurple><div class=3DWordSection1><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'>Terry<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I did some more digging and I =
find there is a difference in the number of threads per =
inch.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'>NPTF<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'>1/8=E2=80=9D=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 27 threads/ inch<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'>=C2=BC=E2=80=9D=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 18<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'>BSPT<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'>1/8=E2=80=9D=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 28 threads/ inch<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'>=C2=BC=E2=80=9D=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 19<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:windowtext'>So these 2 systems =
have threads that are not totally compatible or interchangeable. =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:windowtext'>I believe the tubing =
end of the adaptor is parallel thread.<o:p></o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:windowtext'>The threads per inch =
is the same for either system tapered or =
parallel.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:windowtext'>I would suggest =
measuring the part accurately is the only way to know for =
sure.<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'color:windowtext'>Ron =
Fraser<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'color:windowtext'><o:p>&nbsp;</o:p></span></p></div></body></htm=
l>
------=_NextPart_000_000F_01D770CC.6C67CBE0--

--===============8025164404799948641==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

[email-masked]

Archive: http://www.team.net/pipermail/tigers http://autox.team.net/archive

Unsubscribe: http://autox.team.net/mailman/options/tigers/[email-masked]

--===============8025164404799948641==--

---

From: Terry Lawell <[email-masked]>
Date: Sun, 04 Jul 2021 17:07:00 -0500

This is a multi-part message in MIME format.
--===============2812859377927741459==
 boundary="------------020608020001060008060007"

This is a multi-part message in MIME format.
--------------020608020001060008060007
Content-Transfer-Encoding: 8bit

Ron,

  The fitting I pulled out has an NPT 1/4-18 on the block side and what 
appears to be a BSPP 1/4" on the line side. I bought a 1/4-18 tap and 
die from NAPA today and did some checking. The die fit on the fitting 
very easily and was still easy all the way to the base. The tap actually 
went into the block quite easily and then tightened towards the end of 
the tap. So the conclusion was there is nothing wrong with the fitting 
or the threads in the block. However, when I inserted the fitting into 
the block, it would progress about 4 threads before it stopped. I took 
it out and inserted a 1/4" MIP brass fitting into the block and it 
tightened down after about 7 threads. I pulled it out and measured the 
thread diameter at the point where it stopped. They were at about the 
same diameter reading but were at different depths on the fittings. It 
turns out my original fittings has a different taper than the brass 
fitting as well as being much thicker at the base end. I am thinking 
someone may have used an NPTF thread which gets crushed at insertion, is 
very hard to extract, and cannot be used again. This would address all 
of the symptoms I experienced while removing the fitting and trying to 
reinsert it back into the block. I am going to order a new fitting and 
see what happens.
  Thanks for doing additional research on it for me.

Cheers, Terry

On 7/4/21, 11:02 AM, Ron Fraser wrote:
>
> Terry
>
> I did some more digging and I find there is a difference in the number 
> of threads per inch.
>
> NPTF
>
> 1/8” 27 threads/ inch
>
> ¼” 18
>
> BSPT
>
> 1/8” 28 threads/ inch
>
> ¼” 19
>
> So these 2 systems have threads that are not totally compatible or 
> interchangeable.
>
> I would suggest measuring the part accurately is the only way to know 
> for sure.
>
> Ron Fraser
>

--------------020608020001060008060007
Content-Transfer-Encoding: 8bit

<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    Ron, <br>
    <br>
     The fitting I pulled out has an NPT 1/4-18 on the block side and
    what appears to be a BSPP 1/4" on the line side. I bought a 1/4-18
    tap and die from NAPA today and did some checking. The die fit on
    the fitting very easily and was still easy all the way to the base.
    The tap actually went into the block quite easily and then tightened
    towards the end of the tap. So the conclusion was there is nothing
    wrong with the fitting or the threads in the block. However, when I
    inserted the fitting into the block, it would progress about 4
    threads before it stopped. I took it out and inserted a 1/4" MIP
    brass fitting into the block and it tightened down after about 7
    threads. I pulled it out and measured the thread diameter at the
    point where it stopped. They were at about the same diameter reading
    but were at different depths on the fittings. It turns out my
    original fittings has a different taper than the brass fitting as
    well as being much thicker at the base end. I am thinking someone
    may have used an NPTF thread which gets crushed at insertion, is
    very hard to extract, and cannot be used again. This would address
    all of the symptoms I experienced while removing the fitting and
    trying to reinsert it back into the block. I am going to order a new
    fitting and see what happens.<br>
     Thanks for doing additional research on it for me.<br>
    <br>
    Cheers, Terry<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 7/4/21, 11:02 AM, Ron Fraser wrote:<br>
    </div>
    <blockquote cite="mid:[email-masked]"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <meta name="Generator" content="Microsoft Word 15 (filtered
        medium)">
      <style><!--
/* Font Definitions */
@font-face
	{font-family:"Cambria Math";
	panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
	{font-family:Calibri;
	panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
	{margin:0in;
	margin-bottom:.0001pt;
	font-size:11.0pt;
	font-family:"Calibri",sans-serif;
	color:black;}
span.EmailStyle18
	{mso-style-type:personal-reply;
	font-family:"Calibri",sans-serif;
	color:windowtext;}
.MsoChpDefault
	{mso-style-type:export-only;
	font-size:10.0pt;}
@page WordSection1
	{size:8.5in 11.0in;
	margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
	{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
      <div class="WordSection1">
        <p class="MsoNormal"><span style="color:windowtext">Terry<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">               
            I did some more digging and I find there is a difference in
            the number of threads per inch.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">NPTF<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">1/8”      
            27 threads/ inch<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">¼”          
            18<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">BSPT<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">1/8”      
            28 threads/ inch<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">¼”          
            19<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">So these 2
            systems have threads that are not totally compatible or
            interchangeable. <o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">I believe
            the tubing end of the adaptor is parallel thread.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">The threads
            per inch is the same for either system tapered or parallel.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">I would
            suggest measuring the part accurately is the only way to
            know for sure.<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext">Ron Fraser<o:p></o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
      </div>
    </blockquote>
    <br>
  </body>
</html>

--------------020608020001060008060007--

--===============2812859377927741459==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

[email-masked]

--===============2812859377927741459==--