baconsdozen said:

18mm is virtually the same as 5/8 whitworth. In fact some sockets come marked 5/8 whit / 18mm. There are two whit sizes that have almost direct mm replacements 28mm being the other. Have a look at the conversion charts here

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Oldseadog said:

These are from my days as an apprentice, and are still used occasionally as some things never change

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ricc said:

more likely its the same trackrod end they used on a series in 1948 with a whitworth nut that an 18mm just happens to fit


i had a hilka socket set back in the seventies ... with a set of af sockets and all the even numbered metric ones that were never used...no 13,17, or 19 work that one out.

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