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There are several articles on bolts on my site on the Technical page =
Miscellaneous Section
=20
John Sims
<http://www.healey6.com/> www.healey6.com
Matawan, NJ
=20
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Curtis Arndt
Sent: Wednesday, December 23, 2020 10:54 AM
To: Roger Grace <roggrace@telus.net>; Healey List =
<healeys@autox.team.net>
Subject: Re: [Healeys] Whitworth vs UNC
=20
Here is an excerpt from one of my articles...
=20
On Tue, Dec 22, 2020 at 1:48 PM Curtis Arndt <cnaarndt@gmail.com =
The bolt is 5/16" BSW! Don't let anyone tell you different. =20
=20
Even my 45K original mile '60 Bugeye has its original 5/16" BSW bolt in =
the generator front plate. The problem arises since a 5/16" UNC bolt =
has the same tpi (threads per inch) as the 5/16" BSW bolt. The issue is =
that UNC has a thread pitch angle of 60=C2=B0 and Whitworth by =
definition is 55=C2=B0. The wrong bolt will never torque properly and =
will eventually wear the aluminum generator front plate.
=20
Cheers,
=20
Curt
=20
On Mon, Dec 21, 2020 at 3:53 PM Roger Grace <roggrace@telus.net =
My understanding is that they are close but not interchangeable ?
Thread angles are slightly different.
=20
For AH generator adjusting link is this 5/16 W or 5/16 UNC ?
=20
At back of my mind think they should be Whitworth - think you told me =
that is why they come loose if you use UNC ?
=20
Finding it difficult to identify one from the other.
Any tips to do this welcome.
Have a definite W bolt and comparing to UNC can only see slight rounding =
of UNC ?
=20
Moss sent me a UNC bolt for this link - well that is what they called it =
?
=20
Would appreciate your expert input.
=20
Regards,
Roger Grace
=20
=20
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Arial Black",sans-serif'>There =
are several articles on bolts on my site on the Technical page =
Miscellaneous Section<o:p></o:p></span></b></p><p =
class=3DMsoNormal><b><span style=3D'font-size:12.0pt;font-family:"Arial =
Black",sans-serif'><o:p> </o:p></span></b></p><p =
class=3DMsoNormal><b><span style=3D'font-size:12.0pt;font-family:"Arial =
Black",sans-serif'>John Sims<o:p></o:p></span></b></p><p =
class=3DMsoNormal><b><span style=3D'font-size:12.0pt;font-family:"Arial =
Black",sans-serif'><a href=3D"http://www.healey6.com/";><span =
style=3D'color:#0563C1'>www.healey6.com</span></a><o:p></o:p></span></b><=
/p><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Arial Black",sans-serif'>Matawan, =
NJ<o:p></o:p></span></b></p><p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Arial =
Black",sans-serif'><o:p> </o:p></span></b></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in'><p class=3DMsoNormal><b>From:</b> Healeys =
<healeys-bounces@autox.team.net> <b>On Behalf Of </b>Curtis =
Arndt<br><b>Sent:</b> Wednesday, December 23, 2020 10:54 =
AM<br><b>To:</b> Roger Grace <roggrace@telus.net>; Healey List =
<healeys@autox.team.net><br><b>Subject:</b> Re: [Healeys] =
Whitworth vs UNC<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal>Here is =
an excerpt from one of my articles...<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On =
Tue, Dec 22, 2020 at 1:48 PM Curtis Arndt <<a =
href=3D"mailto:cnaarndt@gmail.com";>cnaarndt@gmail.com</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><p class=3DMsoNormal>The =
bolt is 5/16" BSW! Don't let anyone tell you =
different. <o:p></o:p></p><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Even my 45K original mil<span =
style=3D'font-family:"Arial",sans-serif'>e '60 Bugeye </span>has its =
original 5/16" BSW bolt in the generator front plate. =
The problem arises since a 5/16" UNC bolt has the same tpi (threads =
per inch) as the 5/16" BSW bolt. The issue is that UNC has a =
thread pitch angle of 60<span =
style=3D'font-size:12.0pt;font-family:"Segoe UI =
Symbol",sans-serif'>=C2=B0</span> and Whitworth by definition is =
55<span style=3D'font-size:12.0pt;font-family:"Segoe UI =
Symbol",sans-serif'>=C2=B0. </span><span =
style=3D'font-family:"Arial",sans-serif'> The wrong bolt will never =
torque properly and will eventually wear the aluminum generator front =
plate.</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>Cheers,</span><o:p></o:p></p></d=
iv><div><p class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-family:"Arial",sans-serif'>Curt</span><o:p></o:p></p></div>=
</div><p class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal>On Mon, Dec 21, 2020 at 3:53 PM Roger Grace <<a =
href=3D"mailto:roggrace@telus.net"; =
target=3D"_blank">roggrace@telus.net</a>> =
wrote:<o:p></o:p></p></div><blockquote =
style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in =
6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p =
class=3DMsoNormal>My understanding is that they are close but not =
interchangeable ?<o:p></o:p></p></div><div><p class=3DMsoNormal>Thread =
angles are slightly different.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>For AH generator adjusting link is this 5/16 W or 5/16 =
UNC ?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>At back of my mind think they should be Whitworth =
- think you told me that is why they come loose if you use UNC =
?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Finding it difficult to identify one from the =
other.<o:p></o:p></p></div><div><p class=3DMsoNormal>Any tips to do this =
welcome.<o:p></o:p></p></div><div><p class=3DMsoNormal>Have a definite W =
bolt and comparing to UNC can only see slight rounding of UNC =
?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Moss sent me a UNC bolt for this link - well that is =
what they called it ?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Would appreciate your expert =
input.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal>Regards,<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Roger Grace<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div><div><p =
class=3DMsoNormal><o:p> </o:p></p></div></div></blockquote></div></b=
lockquote></div></div></body></html>
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