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Bob,
If it looks like a 1/4" UNF then it's a 1/4" BSF.
If it looks like a 10-32 SAE machine screw, it is in fact a no. 2 BA.
Lucas used British thread forms!
NEITHER of which is interchangeable! In the case of no. 2 BA... 47-1/2
degree thread pitch (British Association) and 31.4 threads per inch versus
60 degree thread pitch and of course 32 tpi of the no. 10-32.
The 1/4" BSF is 55 degree thread pitch (Whitworth) and 26 tpi while the
1/4: UNF is 60 degree thread pitch and 28 tpi.
Cheers,
Curt
On Sun, Apr 14, 2019 at 4:48 PM Bob Spidell <bspidell@comcast.net> wrote:
> Anybody know the size of the brass nuts used on generator terminals
> (BN2)? They look to be close to SAE 1/4" fine; are they 1/4 BSF?
>
> TIA,
>
> Bob
>
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<div dir=3D"ltr">Bob,=C2=A0<div><br></div><div>If it looks like a 1/4"=
UNF then it's a 1/4" BSF.=C2=A0</div><div><br></div><div>If it lo=
oks like a 10-32 SAE machine screw, it is in fact a no. 2 BA.=C2=A0 Lucas u=
sed British thread forms!</div><div><br></div><div>NEITHER of which is inte=
rchangeable!=C2=A0 In the case of no. 2 BA... 47-1/2 degree thread pitch (B=
ritish Association) and 31.4 threads per inch versus 60 degree thread pitch=
and of course 32 tpi of the no. 10-32.</div><div><br></div><div>The 1/4&qu=
ot; BSF is 55 degree thread pitch (Whitworth) and 26 tpi while the 1/4: UNF=
is 60 degree thread pitch and 28 tpi.</div><div><br></div><div>Cheers,</di=
v><div><br></div><div>Curt</div></div><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr" class=3D"gmail_attr">On Sun, Apr 14, 2019 at 4:48 PM Bob Spidell=
<<a href=3D"mailto:bspidell@comcast.net";>bspidell@comcast.net</a>> w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Anybody kn=
ow the size of the brass nuts used on generator terminals <br>
(BN2)?=C2=A0 They look to be close to SAE 1/4" fine; are they 1/4 BSF?=
<br>
<br>
TIA,<br>
<br>
Bob<br>
<br>
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