[TR] TR] Rocker Shaft locating screw

[DAVID MASSEY]

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.  Good luck finding one of those.
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.
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.  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.
Dave 


 

    On Tuesday, April 29, 2025 at 07:30:40 PM CDT, Roger Elliott <elliottr at rmi.net> wrote:   

  
Thanks Dave,
 
 
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.
 
 
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
 
 
I suspect you are right about it being a Whitworth.
 
 
Thanks,
 Roger
 
 On 4/29/25 18:34, DAVID MASSEY wrote:
  
 
  Moss lists these as  
  https://mossmotors.com/323-215-screw-shaft-locating 
  It may be whitworth or something. 
     Dave 
  
  
  
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