Technical Early ford steering arm castle nut size ?

What size is the nut and does anyone have 1 in the uk please

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This weekend. Get there early, walk fast . Usually finished by 2PM.

 

Trevor..........I'd strongly suggest buying a thread gauge, you can then measure the number of threads and with the diameter of the threaded section you should be able to purchase a nut.........it will be UNF or Unified Fine thread BTW.......probably 1/2",9/16th or 5/8th UNF judging by the pic.......andyd

 

It is not a standard shaped castle nut, it has a shoulder on the back edge, if you can't fine them I have some extra , just pay for the postage

later kb