<html><head></head><body><div class="ydp6b0d9f9byahoo-style-wrap" style="font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">Wikipedia has a fairly comprehensive page on Whitworth bolts</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><a href="https://en.wikipedia.org/wiki/British_Standard_Whitworth" rel="nofollow" target="_blank">https://en.wikipedia.org/wiki/British_Standard_Whitworth</a></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">It looks like it might be a 7/32 which is between M5 and M6. Good luck finding one of those.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Moss has them and Rimmer Brothers have them (part no 104859). I suspect there is one old bloke in the Lake District 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="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Seriously, I'll bet Rimmer contracted a large quantity (1,000?) be produced and sold half of them to Moss.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">But these are hex head rather than Pozidrive. I have only a passing 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 feed stock. Making a Pozidrive (or even Philips) would require a stamping operation to form the head. If you insist on Pozidrive maybe you can arrange a swap with someone who has a Pozidrive screw and is willing to use the hex head.</div><div><br></div><div class="ydp6b0d9f9bsignature"><div style="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="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><font size="4">Dave <br></font></div><div><span style="font-size:10.0pt;font-family:sans-serif;color:black;"><br></span></div><br></div></div></div></div>
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On Tuesday, April 29, 2025 at 07:30:40 PM CDT, Roger Elliott <elliottr@rmi.net> wrote:
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<p>Thanks Dave,<br clear="none">
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<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="none">
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<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.
It would not go into a M5x.8<br clear="none">
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<p>I suspect you are right about it being a Whitworth.<br clear="none">
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<p>Thanks,<br clear="none">
Roger<br clear="none">
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<div id="ydp3e1984cdyiv2435572665yqt25310" class="ydp3e1984cdyiv2435572665yqt1383488318"><div class="ydp3e1984cdyiv2435572665moz-cite-prefix">On 4/29/25 18:34, DAVID MASSEY wrote:<br clear="none">
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<div dir="ltr">Moss lists these as </div>
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<div dir="ltr"><a shape="rect" href="https://mossmotors.com/323-215-screw-shaft-locating" class="ydp3e1984cdyiv2435572665moz-txt-link-freetext" rel="nofollow" target="_blank">https://mossmotors.com/323-215-screw-shaft-locating</a></div>
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<div dir="ltr">It may be whitworth or
something.</div>
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<div><font size="4">Dave <br clear="none">
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