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It's a bit more complicated than that.
There is actually no such thread as an AF thread. AF refers to Across the
Flats and is measurement across the hexagonal nut and denotes the spanner
(wrench) size.
i.e. a 5/16" UNF bolt is 1/2" AF.
There was a change made in the name of the thread form early in BN1
production from SAE (Society of Automotive Engineers) some say (Standard
American Engineers but are wrong) to UNF (Unified National Fine). SAE
actually refers to the "Family" of threads which includes UNC and UNF.
These threads have a thread angle of 60 degrees. The "F" and "C" refer to
the pitch or threads per inch.
For the most part the threads used on the brake lines of Healeys are 3/8" x
24. 3/8" diameter and 24 threads per inch.
Whitworth refers to a different and older "family " of threads which have a
55 degree thread angle.
I should mention that there were also some differences in the shapes used
at the bases and peaks of these different thread forms which Google can
help you with if you haven't already fallen asleep.
Hope that doesn't serve to further muddy the waters.
M
On Sun., Feb. 26, 2023, 3:26 p.m. Hank Leach via Healeys, <
healeys@autox.team.net> wrote:
> Gary- The note about the type of thread used was what I was referring
> to-mentioned earlier. The early BN1 used AF type threads.(equivalent to a
> 1949 Chevrolet). All the later cars (and I do not know where the changeover
> was-maybe Michael does) had unified Girling threads. The lines should
> thread easily or else you have a different thread count and pitch. I don't
> think you will find the early type hoses from any supplier. They will have
> to be special made or found in NOS. Hank
>
> -----------------------------------------
> From: warthodson@aol.com
> To: "gradea1@charter.net"
> Cc: "healeys@autox.team.net"
> Sent: Saturday February 25 2023 1:24:04PM
> Subject: Re: [Healeys] 100 front brakes
>
> This car is a BN1.
> Yes, I was referring to the brake wheel cylinders or slave cylinders as
> opposed to the master cylinder.
> What are you referring to when you say "Be sure that you were supplied
> the correct threaded hose...most suppliers do not have the early style."
> How do I identify an early style hose from a latter style hose?
> Gary Hodson
>
> -----Original Message-----
> From: Hank Leach <gradea1@charter.net>
> To: 'warthodson@aol.com' <warthodson@aol.com>
> Cc: 'healeys@autox.team.net' <healeys@autox.team.net>
> Sent: Sat, Feb 25, 2023 12:59 pm
> Subject: RE: [Healeys] 100 front brakes
>
> Do you mean "wheel" cylinders and not "slave"...100s have a mechanical
> clutch. I understand that on all model Healeys the brake hoses have one
> threaded end and one flared end. That flare goes into the metal line nut.
>
> On the early 100 wheel cylinders they used an American AF thread but
> switched over to the Girling unified thread on later releases. The bleeder
> connection can be either in or out in shape (photo) but if the bleed screw
> is flat it uses the check ball (supplied in rebuild kits) and fits the
> recessed shape. The pointed bleeder uses no check ball. Be sure that you
> were supplied the correct threaded hose...most suppliers do not have the
> early style. Use Girling red grease on the threads. Hank
>
> -----------------------------------------
> From: "warthodson--- via Healeys"
> To: "healeys@autox.team.net"
> Cc:
> Sent: Friday February 24 2023 5:15:16PM
> Subject: [Healeys] 100 front brakes
>
> I will be assisting a friend to replace the flexible hoses on his 100
> front brakes. He has ordered and received a set of hoses, but the ends that
> thread into the slave Cyl do not match the shape of the mating surface in
> the slave. The ends of the hoses are flat & it is my understanding that the
> cyl. is cone shaped inside. The vender says this is not a problem. I think
> it is a problem.
> What do you say?
> Also, if it is an issue, where can we get a set of flex hoses that have
> the correct ends for this application & are also the correct length (I.E.
> Not too short)?
> Gary Hodson
>
> _______________________________________________
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>
--0000000000006457a005f593eba2
Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto"><div dir=3D"auto">It's a bit more complicated than th=
at.<div dir=3D"auto">There is actually no such thread as an AF thread. AF r=
efers to Across the Flats and is measurement across the hexagonal nut and d=
enotes the spanner (wrench) size.=C2=A0</div><div dir=3D"auto">i.e. a 5/16&=
quot; UNF bolt is 1/2" AF.</div><div dir=3D"auto">There was a change m=
ade in the name of the thread form early in BN1 production from SAE (Societ=
y of Automotive Engineers) some say (Standard American Engineers but are wr=
ong) to UNF (Unified National Fine). SAE actually refers to the "Famil=
y" of threads which includes UNC and UNF. These threads have a thread =
angle of 60 degrees.=C2=A0 The "F" and "C" refer to the=
pitch or threads per inch.</div><div dir=3D"auto">For the most part the th=
reads used on the brake lines of Healeys are 3/8" x 24. 3/8" diam=
eter and 24 threads per inch.=C2=A0</div><div dir=3D"auto">Whitworth refers=
to a different and older "family " of threads which have a 55 de=
gree thread angle.=C2=A0</div><div dir=3D"auto">I should mention that there=
were also some differences in the shapes used at the bases and peaks of th=
ese different thread forms which Google can help you with if you haven'=
t already fallen asleep.</div><div dir=3D"auto">Hope that doesn't serve=
to further muddy the waters.</div><div dir=3D"auto"><br></div><div dir=3D"=
auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D=
"gmail_attr">On Sun., Feb. 26, 2023, 3:26 p.m. Hank Leach via Healeys, <=
<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"noreferr=
er">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex"><div>Gary- The note about the type of thread used was what I was ref=
erring to-mentioned earlier. The early BN1 used AF type threads.(equivalent=
to a 1949 Chevrolet). All the later cars (and I do not know where the chan=
geover was-maybe Michael does) had unified Girling threads. The lines shoul=
d thread easily or else you have a different thread count and pitch. I don&=
#39;t think you will find the early type hoses from any supplier. They will=
have to be special made or found in NOS. Hank<br><br><div></div><p>-------=
----------------------------------</p>From: <a href=3D"mailto:warthodson@ao=
l.com" rel=3D"noreferrer noreferrer" target=3D"_blank">warthodson@aol.com</=
a><br>To: "<a href=3D"mailto:gradea1@charter.net"; rel=3D"noreferrer no=
referrer" target=3D"_blank">gradea1@charter.net</a>"<br>Cc: "<a h=
ref=3D"mailto:healeys@autox.team.net"; rel=3D"noreferrer noreferrer" target=
=3D"_blank">healeys@autox.team.net</a>"<br>Sent: Saturday February 25 =
2023 1:24:04PM<br>Subject: Re: [Healeys] 100 front brakes<br><br>
<div style=3D"color:#000000;font:12pt 'Comic Sans MS',sans-serif">
<div>This car is a BN1.</div>
Yes, I was referring to the brake wheel cylinders or slave
cylinders as opposed to the master cylinder.
<div>What are you referring to when you say=C2=A0 "<span style=3D"font=
-family:arial,helvetica;font-size:small">Be sure that you
were supplied the correct threaded hose...most suppliers do not
have the early style."</span></div>
<div><font size=3D"3">How do I identify an early style hose from a
latter style hose?</font><br>
Gary Hodson<br><br><div style=3D"font-family:arial,helvetica;font-size:10pt=
;color:#000000">
<font size=3D"2">-----Original Message-----<br>
From: Hank Leach <<a href=3D"mailto:gradea1@charter.net"; rel=3D"noreferr=
er noreferrer" target=3D"_blank">gradea1@charter.net</a>><br>
To: '<a href=3D"mailto:warthodson@aol.com"; rel=3D"noreferrer noreferrer=
" target=3D"_blank">warthodson@aol.com</a>' <<a href=3D"mailto:warth=
odson@aol.com" rel=3D"noreferrer noreferrer" target=3D"_blank">warthodson@a=
ol.com</a>><br>
Cc: '<a href=3D"mailto:healeys@autox.team.net"; rel=3D"noreferrer norefe=
rrer" target=3D"_blank">healeys@autox.team.net</a>' <<a href=3D"mail=
to:healeys@autox.team.net" rel=3D"noreferrer noreferrer" target=3D"_blank">=
healeys@autox.team.net</a>><br>
Sent: Sat, Feb 25, 2023 12:59 pm<br>
Subject: RE: [Healeys] 100 front brakes<br><br></font>
<div>
<div><font size=3D"2">Do you mean "wheel" cylinders and not
"slave"...100s have a mechanical clutch. I understand that on all
model Healeys the brake hoses have one threaded end and one flared
end. That flare goes into the metal line nut.</font>
<div><font size=3D"2"><br clear=3D"none"></font></div>
<div><font size=3D"2">On the early 100 wheel cylinders they used an
American AF thread but switched over to the Girling unified thread
on later releases. The bleeder connection can be either in or out
in shape (photo) but if the bleed screw is flat it uses the check
ball (supplied in rebuild kits) and fits the recessed shape. The
pointed bleeder uses no check ball.=C2=A0 Be sure that you were
supplied the correct threaded hose...most suppliers do not have the
early style. Use Girling red grease on the threads. Hank<br clear=3D"none">=
<br clear=3D"none"></font>
<div></div>
<div>
<div><font size=3D"2">-----------------------------------------</font></div=
>
<font size=3D"2">From: "warthodson--- via Healeys"<br clear=3D"no=
ne">
To: "<a href=3D"mailto:healeys@autox.team.net"; rel=3D"noreferrer noref=
errer" target=3D"_blank">healeys@autox.team.net</a>"<br clear=3D"none"=
>
Cc:<br clear=3D"none">
Sent: Friday February 24 2023 5:15:16PM<br clear=3D"none">
Subject: [Healeys] 100 front brakes<br clear=3D"none"><br clear=3D"none"></=
font>
<div style=3D"color:#000000;font:12pt 'Comic Sans MS',sans-serif">
<font size=3D"2">I will be assisting a friend to replace the flexible
hoses on his 100 front brakes. He has ordered and received a set of
hoses, but the ends that thread into the slave Cyl do not match the
shape of the mating surface in the slave. The ends of the hoses are
flat & it is my understanding that the cyl. is cone shaped inside.
The vender says this is not a problem. I think it is a
problem.</font>
<div><font size=3D"2">What do you say?=C2=A0</font></div>
<div><font size=3D"2">Also, if it is an issue, where can we get a set
of flex hoses that have the correct ends for this application & are
also the correct length (I.E. Not too short)?</font></div>
<div><font size=3D"2">Gary Hodson<br clear=3D"none"></font>
<div><font size=3D"2">=C2=A0=C2=A0</font></div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div></div>
_______________________________________________<br>
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</blockquote></div></div>
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