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Windscreen screws on 100s are no. 4 BA. The six cylinder screws are NOT
2BA. AH Spares is wrong on this one.
Regarding no. 2 BA and 10-32 being similar they may be about the same size
but they are in NO WAY interchangeable!!!
A 10-32 screw has 32 tpi and has a 60 degree pitch angle of the threads. A
no. 2 BA has 31.4 tpi and is 47 1/2 degree pitch angle of the threads.
Cheers,
Curt
AH Concours Registry Chairman and fastener expert
On Wed, Feb 10, 2016 at 1:31 PM, Ian Hey <rianhey@btinternet.com> wrote:
> Hello All
>
>
>
> I have a BJ7 and have been told (by AH Spares) that the windscreen screws
> are 2BA. That is similar to No10 UNF so that is what mine now are.
>
>
>
> No 6-36 sounds as if it is very similar to 4BA which is 0.142 inch
> diameter, 38.5 threads per inch. BA (British Association) threads are
> widely used for threads less than =C2=BC inch in all British mechanical a=
nd
> electrical equipment up to the 1960s and 1970s. They have probably died
> out now in new equipment. The largest is 0BA which has a diameter of 0.2=
36
> inch.
>
>
>
> I suspect that the windscreen screws referred to as No 6-36 are actually
> 4BA
>
>
>
> Regards
>
>
>
> Ian Hey
>
>
>
>
>
>
>
>
>
>
>
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<div dir=3D"ltr"><div><div><div><div>Windscreen screws on 100s are no. 4 BA=
.=C2=A0 The six cylinder screws are NOT 2BA. AH Spares is wrong on this one=
.<br><br></div>Regarding no. 2 BA and 10-32 being similar they may be about=
the same size but they are in NO WAY interchangeable!!!<br><br></div>A 10-=
32 screw has 32 tpi and has a 60 degree pitch angle of the threads.=C2=A0 A=
no. 2 BA has 31.4 tpi and is 47 1/2 degree pitch angle of the threads.<br>=
<br></div>Cheers,<br><br></div>Curt <br>AH Concours Registry Chairman and f=
astener expert<br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_=
quote">On Wed, Feb 10, 2016 at 1:31 PM, Ian Hey <span dir=3D"ltr"><<a hr=
ef=3D"mailto:rianhey@btinternet.com"; target=3D"_blank">rianhey@btinternet.c=
om</a>></span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>
<div link=3D"blue" vlink=3D"purple" lang=3D"EN-GB">
<div>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial">Hello All<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial">I have a BJ7 and have been told (by AH Spare=
s) that the
windscreen screws are 2BA.=C2=A0 That is similar to No10 UNF so that is wha=
t
mine now are.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial">No 6-36 sounds as if it is very similar to 4=
BA which is
0.142 inch diameter, 38.5 threads per inch.=C2=A0 BA (British Association)
threads are widely used for threads less than =C2=BC inch in all British me=
chanical
and electrical equipment up to the 1960s and 1970s.=C2=A0 They have probabl=
y
died out now in new equipment.=C2=A0 The largest is 0BA which has a diamete=
r of
0.236 inch.<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial">I suspect that the windscreen screws referre=
d to as No 6-36
are actually 4BA<u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial">Regards<span class=3D"HOEnZb"><font color=3D=
"#888888"><u></u><u></u></font></span></span></font></p><span class=3D"HOEn=
Zb"><font color=3D"#888888">
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><u></u><font size=3D"2" face=3D"Arial"><span style=
=3D"font-size:10.0pt;font-family:Arial">Ian Hey</span></font><u></u><font s=
ize=3D"2" face=3D"Arial"><span style=3D"font-size:10.0pt;font-family:Arial"=
><u></u><u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Arial"><span style=3D"font-=
size:12.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"font-=
size:10.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Arial"><span style=3D"font-=
size:12.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Arial"><span style=3D"font-=
size:12.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
<p class=3D"MsoNormal"><font size=3D"3" face=3D"Arial"><span style=3D"font-=
size:12.0pt;font-family:Arial"><u></u>=C2=A0<u></u></span></font></p>
</font></span></div>
</div>
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