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Wikipedia has a fairly comprehensive page on Whitworth bolts
https://en.wikipedia.org/wiki/British_Standard_Whitworth
It looks like it might be a 7/32 which is between M5 and M6.=C2=A0 Good luc=
k finding one of those.
Moss has them and Rimmer Brothers have them (part no 104859).=C2=A0 I suspe=
ct there is one old bloke in the Lake District who still has the tooling an=
d is making them in his retirement.=C2=A0 Such was the nature of the Britis=
h Auto Industry in the early years after the war.
Seriously, I'll bet Rimmer contracted a large quantity (1,000?) be produced=
and sold half of them to Moss.
But these are hex head rather than Pozidrive.=C2=A0 I have only a passing f=
amiliarity with machine shop operations but I suspect that making the hex h=
ead version is much easier to make using an NC lathe and hexagonal feed sto=
ck.=C2=A0 Making a Pozidrive (or even Philips) would require a stamping ope=
ration to form the head.=C2=A0 If you insist on Pozidrive maybe you can arr=
ange a swap with someone who has a Pozidrive screw and is willing to use th=
e hex head.
Dave=20
=20
On Tuesday, April 29, 2025 at 07:30:40 PM CDT, Roger Elliott <elliottr@=
rmi.net> wrote: =20
=20
Thanks Dave,
=20
=20
I have a couple of the screws. (though mine have a Pozidriv head instead.=
=C2=A0 The problem is I have 2 rocker shafts that were tapped for the wrong=
size. So, I am trying to figure out if I could tap them to the right size.
=20
=20
What I said on a previous post was wrong.=C2=A0 I went back to a hardware s=
tore and the locating screw slid right into the M6x1 tester with out having=
to turn it.=C2=A0 So it is smaller than that.=C2=A0 It would not go into a=
M5x.8
=20
=20
I suspect you are right about it being a Whitworth.
=20
=20
Thanks,
Roger
=20
On 4/29/25 18:34, DAVID MASSEY wrote:
=20
=20
Moss lists these as=C2=A0=20
https://mossmotors.com/323-215-screw-shaft-locating=20
It may be whitworth or something.=20
Dave=20
=20
=20
=20
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<html><head></head><body><div class=3D"ydp6b0d9f9byahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div><div dir=
=3D"ltr" data-setdir=3D"false">Wikipedia has a fairly comprehensive page on=
Whitworth bolts</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div=
dir=3D"ltr" data-setdir=3D"false"><a href=3D"https://en.wikipedia.org/wiki=
/British_Standard_Whitworth" rel=3D"nofollow" target=3D"_blank">https://en.=
wikipedia.org/wiki/British_Standard_Whitworth</a></div><div dir=3D"ltr" dat=
a-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">It look=
s like it might be a 7/32 which is between M5 and M6. Good luck findi=
ng one of those.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div=
dir=3D"ltr" data-setdir=3D"false">Moss has them and Rimmer Brothers have t=
hem (part no 104859). I suspect there is one old bloke in the Lake Di=
strict who still has the tooling and is making them in his retirement. =
; Such was the nature of the British Auto Industry in the early years after=
the war.</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D=
"ltr" data-setdir=3D"false">Seriously, I'll bet Rimmer contracted a large q=
uantity (1,000?) be produced and sold half of them to Moss.</div><div dir=
=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"fa=
lse">But these are hex head rather than Pozidrive. I have only a pass=
ing familiarity with machine shop operations but I suspect that making the =
hex head version is much easier to make using an NC lathe and hexagonal fee=
d stock. Making a Pozidrive (or even Philips) would require a stampin=
g operation to form the head. If you insist on Pozidrive maybe you ca=
n arrange a swap with someone who has a Pozidrive screw and is willing to u=
se the hex head.</div><div><br></div><div class=3D"ydp6b0d9f9bsignature"><d=
iv style=3D"color: black; font-style: normal; font-size-adjust: none; font-=
weight: normal; font-stretch: normal; font-size: 12pt; line-height: normal;=
font-family: Arial, Helvetica, sans-serif;"><div style=3D"color: black; fo=
nt-style: normal; font-size-adjust: none; font-weight: normal; font-stretch=
: normal; font-size: 12pt; line-height: normal; font-family: Arial, Helveti=
ca, sans-serif;"><div><font size=3D"4">Dave <br></font></div><div><span sty=
le=3D"font-size:10.0pt;font-family:sans-serif;color:black;"><br></span></di=
v><br></div></div></div></div>
<div><br></div><div><br></div>
=20
</div><div id=3D"ydp3e1984cdyahoo_quoted_6067833480" class=3D"ydp3e=
1984cdyahoo_quoted"><div class=3D"ydp3e1984cdyahoo-style-wrap" style=3D"fon=
t-family:Arial, Helvetica, sans-serif;font-size:16px;">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div class=3D"ydp3e1984cdquoted-text-header">
On Tuesday, April 29, 2025 at 07:30:40 PM CDT, Roge=
r Elliott <elliottr@rmi.net> wrote:
</div>
</div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"ydp3e1984cdinline_rep=
ly_quote_container" data-split-quote-node=3D"true">
<div><br></div><div><br></div>
<div><div id=3D"ydp3e1984cdyiv2435572665"><div>
<p>Thanks Dave,<br clear=3D"none">
</p>
<p>I have a couple of the screws. (though mine have a Pozidriv head
instead. The problem is I have 2 rocker shafts that were tapped
for the wrong size. So, I am trying to figure out if I could tap
them to the right size.<br clear=3D"none">
</p>
<p>What I said on a previous post was wrong. I went back to a
hardware store and the locating screw slid right into the M6x1
tester with out having to turn it. So it is smaller than that.&=
nbsp;
It would not go into a M5x.8<br clear=3D"none">
</p>
<p>I suspect you are right about it being a Whitworth.<br clear=3D"none=
">
</p>
<p>Thanks,<br clear=3D"none">
Roger<br clear=3D"none">
</p>
<div id=3D"ydp3e1984cdyiv2435572665yqt25310" class=3D"ydp3e1984cdyiv243=
5572665yqt1383488318"><div class=3D"ydp3e1984cdyiv2435572665moz-cite-prefix=
">On 4/29/25 18:34, DAVID MASSEY wrote:<br clear=3D"none">
</div>
<blockquote type=3D"cite">
</blockquote></div></div><div id=3D"ydp3e1984cdyiv2435572665yqt97806"=
class=3D"ydp3e1984cdyiv2435572665yqt1383488318"><div><div style=3D"font-fa=
mily:Arial, Helvetica, sans-serif;font-size:16px;" class=3D"ydp3e1984cdyiv2=
435572665ydp87caafd6yahoo-style-wrap">
<div>
<div dir=3D"ltr">Moss lists these as </div>
<div dir=3D"ltr"><br clear=3D"none">
</div>
<div dir=3D"ltr"><a shape=3D"rect" href=3D"https://mossmotors.com=
/323-215-screw-shaft-locating" class=3D"ydp3e1984cdyiv2435572665moz-txt-lin=
k-freetext" rel=3D"nofollow" target=3D"_blank">https://mossmotors.com/323-2=
15-screw-shaft-locating</a></div>
<div dir=3D"ltr"><br clear=3D"none">
</div>
<div dir=3D"ltr">It may be whitworth or
something.</div>
<div><br clear=3D"none">
</div>
<div class=3D"ydp3e1984cdyiv2435572665ydp87caafd6signature">
<div style=3D"color:black;font-style:normal;font-size-adjust:no=
ne;font-weight:normal;font-stretch:normal;font-size:12pt;line-height:normal=
;font-family:Arial, Helvetica, sans-serif;">
<div style=3D"color:black;font-style:normal;font-size-adjust:=
none;font-weight:normal;font-stretch:normal;font-size:12pt;line-height:norm=
al;font-family:Arial, Helvetica, sans-serif;">
<div><font size=3D"4">Dave <br clear=3D"none">
</font></div>
<div><span style=3D"font-size:10.0pt;font-family:sans-serif=
;color:black;"><br clear=3D"none">
</span></div>
</div></div></div></div></div></div></div></div><div class=
=3D"ydp3e1984cdyqt1383488318" id=3D"ydp3e1984cdyqt70469"><br clear=3D"none"=
></div></div>
</div>
</div></div></body></html>
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