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Thanks Bob ... I think you have nailed it.
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
> > 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
> >
> > 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=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.
> >
> > 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
> >
> >
> > _______________________________________________
> > Support Team.Net http://www.team.net/donate.html
> > Suggested annual donation $12.75
> >
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> >
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> >
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> >
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> >
> >
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<div dir=3D"auto">Thanks Bob=C2=A0 ... I=C2=A0 think you have nailed it.=C2=
=A0<div dir=3D"auto"><br></div><div dir=3D"auto">M</div></div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed., Dec. 23, 2=
020, 12:46 p.m. Bob Haskell, <<a href=3D"mailto:rchaskell@earthlink.net"=
>rchaskell@earthlink.net</a>> wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:=
1ex">Michael,<br>
<br>
I'm going to guess 1/4" BSP.=C2=A0 0.518" OD - 19TPI.<br>
<br>
<a href=3D"https://britishfasteners.com/threads-bsp"; rel=3D"noreferrer nore=
ferrer" target=3D"_blank">https://britishfasteners.com/threads-bsp</a><br>
<br>
Cheers,<br>
<br>
Bob Haskell<br>
Austin Healey 3000 BN7/BT7 registrar<br>
<br>
On 12/23/20 11:30 AM, Michael Salter wrote:<br>
> Well I have one for you Curt.<br>
> The thread on the oil drain back pipe on the 100 engine (1B1236) has <=
br>
> me stumped.<br>
> The tube is 0.500" O.D. with an I.D. of 0.362"<br>
> The OD of the thread is 0.511" and it is 19 T.P.I.<br>
> I cannot find a 19 TPI x 1/2" pipe or tube spec anywhere .... any=
ideas?<br>
><br>
> M<br>
><br>
><br>
> On Wed, Dec 23, 2020 at 10:54 AM Curtis Arndt <<a href=3D"mailto:cn=
aarndt@gmail.com" target=3D"_blank" rel=3D"noreferrer">cnaarndt@gmail.com</=
a> <br>
> <mailto:<a href=3D"mailto:cnaarndt@gmail.com"; target=3D"_blank" rel=
=3D"noreferrer">cnaarndt@gmail.com</a>>> wrote:<br>
><br>
>=C2=A0 =C2=A0 =C2=A0Here is an excerpt from one of my articles...<br>
><br>
>=C2=A0 =C2=A0 =C2=A0On Tue, Dec 22, 2020 at 1:48 PM Curtis Arndt <<a=
href=3D"mailto:cnaarndt@gmail.com"; target=3D"_blank" rel=3D"noreferrer">cn=
aarndt@gmail.com</a><br>
>=C2=A0 =C2=A0 =C2=A0<mailto:<a href=3D"mailto:cnaarndt@gmail.com"; ta=
rget=3D"_blank" rel=3D"noreferrer">cnaarndt@gmail.com</a>>> wrote:<br=
>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The bolt is 5/16" BSW!=C2=A0 =C2=
=A0Don't let anyone tell you different.<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Even my 45K original mile '60 Bug=
eye has its original 5/16"<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0BSW bolt in the generator front plate=
.=C2=A0 The problem arises<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0since a 5/16" UNC bolt has the s=
ame tpi (threads per inch) as<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the 5/16" BSW bolt.=C2=A0 The is=
sue is that UNC has a thread pitch<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0angle of 60=C2=B0=C2=A0and Whitworth =
by definition is 55=C2=B0. The wrong<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0bolt will never torque properly and w=
ill eventually wear the<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0aluminum generator front plate.<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Curt<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Mon, Dec 21, 2020 at 3:53 PM Roger=
Grace<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<<a href=3D"mailto:roggrace@telus.=
net" target=3D"_blank" rel=3D"noreferrer">roggrace@telus.net</a> <mailto=
:<a href=3D"mailto:roggrace@telus.net"; target=3D"_blank" rel=3D"noreferrer"=
>roggrace@telus.net</a>>> wrote:<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0My understanding is tha=
t they are close but not<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0interchangeable ?<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thread angles are sligh=
tly different.<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0For AH generator adjust=
ing link is this 5/16 W or 5/16 UNC ?<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0At back of my mind thin=
k they should be Whitworth -=C2=A0 think<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0you told me that is why=
they come loose if you use UNC ?<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Finding it difficult to=
identify one from the other.<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Any tips to do this wel=
come.<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Have a definite W bolt =
and comparing to UNC can only see<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0slight rounding of UNC =
?<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Moss sent me a UNC bolt=
for this link - well that is what<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0they called it ?<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Would appreciate your e=
xpert input.<br>
><br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Regards,<br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Roger Grace<br>
><br>
><br>
>=C2=A0 =C2=A0 =C2=A0_______________________________________________<br>
>=C2=A0 =C2=A0 =C2=A0Support Team.Net <a href=3D"http://www.team.net/don=
ate.html" rel=3D"noreferrer noreferrer" target=3D"_blank">http://www.team.n=
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</blockquote></div>
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