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Understanding UNC and Whitworth is one thing but BSPP and BSTP fittings =
is a
whole 'nother rabbit hole!
_____ =20
From: Healeys [mailto:healeys-bounces@autox.team.net] On Behalf Of =
Michael
Salter
Sent: Wednesday, December 23, 2020 9:48 AM
To: Bob Haskell
Cc: Healey List
Subject: Re: [Healeys] Whitworth vs UNC
Thanks Bob ... I think you have nailed it. =20
M
On Wed., Dec. 23, 2020, 12:46 p.m. Bob Haskell, =
<rchaskell@earthlink.net>
wrote:
Michael,
I'm going to guess 1/4" BSP. 0.518" OD - 19TPI.
https://britishfasteners.com/threads-bsp
Cheers,
Bob Haskell
Austin Healey 3000 BN7/BT7 registrar
On 12/23/20 11:30 AM, Michael Salter wrote:
> Well I have one for you Curt.
> The thread on the oil drain back pipe on the 100 engine (1B1236) has=20
> me stumped.
> The tube is 0.500" O.D. with an I.D. of 0.362"
> The OD of the thread is 0.511" and it is 19 T.P.I.
> I cannot find a 19 TPI x 1/2" pipe or tube spec anywhere .... any =
ideas?
>
> M
>
>
> On Wed, Dec 23, 2020 at 10:54 AM Curtis Arndt <cnaarndt@gmail.com=20
>
> Here is an excerpt from one of my articles...
>
> 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.
>
> 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=B0 and Whitworth by definition is 55=B0. The wrong
> bolt will never torque properly and will eventually wear the
> aluminum generator front plate.
>
> Cheers,
>
> Curt
>
> On Mon, Dec 21, 2020 at 3:53 PM Roger Grace
>
> My understanding is that they are close but not
> interchangeable ?
> Thread angles are slightly different.
>
> For AH generator adjusting link is this 5/16 W or 5/16 UNC =
?
>
> At back of my mind think they should be Whitworth - think
> you told me that is why they come loose if you use UNC ?
>
> 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 ?
>
> Moss sent me a UNC bolt for this link - well that is what
> they called it ?
>
> Would appreciate your expert input.
>
> Regards,
> Roger Grace
>
>
> _______________________________________________
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> =
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>
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D314203502-24122020><FONT =
color=3D#0000ff=20
size=3D2 face=3DArial>Understanding UNC and Whitworth is one thing but =
BSPP and BSTP=20
fittings is a whole 'nother rabbit hole!</FONT></SPAN></DIV><BR>
<DIV lang=3Den-us class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>From:</B> Healeys=20
[mailto:healeys-bounces@autox.team.net] <B>On Behalf Of </B>Michael=20
Salter<BR><B>Sent:</B> Wednesday, December 23, 2020 9:48 =
AM<BR><B>To:</B> Bob=20
Haskell<BR><B>Cc:</B> Healey List<BR><B>Subject:</B> Re: [Healeys] =
Whitworth vs=20
UNC<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Thanks Bob ... I think you have nailed it.
<DIV><BR></DIV>
<DIV>M</DIV></DIV><BR>
<DIV class=3Dgmail_quote>
<DIV class=3Dgmail_attr dir=3Dltr>On Wed., Dec. 23, 2020, 12:46 p.m. Bob =
Haskell,=20
<<A =
href=3D"mailto:rchaskell@earthlink.net";>rchaskell@earthlink.net</A>>=20
wrote:<BR></DIV>
<BLOCKQUOTE class=3Dgmail_quote=20
style=3D"PADDING-LEFT: 1ex; BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px =
0px 0.8ex">Michael,<BR><BR>I'm=20
going to guess 1/4" BSP. 0.518" OD - 19TPI.<BR><BR><A=20
href=3D"https://britishfasteners.com/threads-bsp"; rel=3D"noreferrer =
noreferrer"=20
=
target=3D_blank>https://britishfasteners.com/threads-bsp</A><BR><BR>Cheer=
s,<BR><BR>Bob=20
Haskell<BR>Austin Healey 3000 BN7/BT7 registrar<BR><BR>On 12/23/20 =
11:30 AM,=20
Michael Salter wrote:<BR>> Well I have one for you Curt.<BR>> =
The thread=20
on the oil drain back pipe on the 100 engine (1B1236) has <BR>> me=20
stumped.<BR>> The tube is 0.500" O.D. with an I.D. of =
0.362"<BR>> The OD=20
of the thread is 0.511" and it is 19 T.P.I.<BR>> I cannot find a 19 =
TPI x=20
1/2" pipe or tube spec anywhere .... any ideas?<BR>><BR>>=20
M<BR>><BR>><BR>> On Wed, Dec 23, 2020 at 10:54 AM Curtis =
Arndt <<A=20
href=3D"mailto:cnaarndt@gmail.com"; rel=3Dnoreferrer=20
target=3D_blank>cnaarndt@gmail.com</A> <BR>> <mailto:<A=20
href=3D"mailto:cnaarndt@gmail.com"; rel=3Dnoreferrer=20
target=3D_blank>cnaarndt@gmail.com</A>>> =
wrote:<BR>><BR>> =20
Here is an excerpt from one of my=20
articles...<BR>><BR>> On Tue, Dec 22, 2020 at =
1:48 PM=20
Curtis Arndt <<A href=3D"mailto:cnaarndt@gmail.com"; =
rel=3Dnoreferrer=20
target=3D_blank>cnaarndt@gmail.com</A><BR>> =
<mailto:<A=20
href=3D"mailto:cnaarndt@gmail.com"; rel=3Dnoreferrer=20
target=3D_blank>cnaarndt@gmail.com</A>>> =
wrote:<BR>><BR>> =20
The bolt is 5/16" BSW! Don't =
let anyone=20
tell you different.<BR>><BR>> =
Even my=20
45K original mile '60 Bugeye has its original 5/16"<BR>> =
=20
BSW bolt in the generator front plate. The =
problem=20
arises<BR>> since a 5/16" UNC bolt =
has the=20
same tpi (threads per inch) as<BR>> =
the=20
5/16" BSW bolt. The issue is that UNC has a thread =
pitch<BR>> =20
angle of 60=B0 and Whitworth by =
definition is=20
55=B0. The wrong<BR>> bolt will =
never torque=20
properly and will eventually wear the<BR>> =
=20
aluminum generator front plate.<BR>><BR>> =
=20
Cheers,<BR>><BR>> =20
Curt<BR>><BR>> On Mon, =
Dec 21,=20
2020 at 3:53 PM Roger Grace<BR>> =
<<A=20
href=3D"mailto:roggrace@telus.net"; rel=3Dnoreferrer=20
target=3D_blank>roggrace@telus.net</A> <mailto:<A=20
href=3D"mailto:roggrace@telus.net"; rel=3Dnoreferrer=20
target=3D_blank>roggrace@telus.net</A>>> =
wrote:<BR>><BR>> =20
My understanding is that they =
are=20
close but not<BR>> =20
interchangeable ?<BR>> =
=20
Thread angles are slightly different.<BR>><BR>> =
=20
For AH generator adjusting link is =
this 5/16=20
W or 5/16 UNC ?<BR>><BR>> =
=20
At back of my mind think they should be Whitworth - =20
think<BR>> you told =
me that=20
is why they come loose if you use UNC ?<BR>><BR>> =
=20
Finding it difficult to identify one from =
the=20
other.<BR>> Any tips =
to do=20
this welcome.<BR>> =
Have a=20
definite W bolt and comparing to UNC can only see<BR>> =
=20
slight rounding of UNC =
?<BR>><BR>> =20
Moss sent me a UNC bolt for =
this link=20
- well that is what<BR>> =20
they called it ?<BR>><BR>> =
=20
Would appreciate your expert input.<BR>><BR>> =
=20
Regards,<BR>> =
=20
Roger Grace<BR>><BR>><BR>> =20
_______________________________________________<BR>> =
=20
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