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gbj_tester in reply to @mespilus

It is a BBB aluminium seat post that, I believe, was standard on this 'Team C' carbon Boardman

In that case it's definitely a regular ISO coarse metric thread, and any fit issues are down to damage.

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mespilus in reply to @gbj_tester

Saddle was changed maybe two months ago,
and,
I don't remember the bolts being particularly hard to loosen/tighten.
Would neglectful, (no grease), corrosion of the (barrel?) nut lead to such an amount of play?
A standard M5 bolt wobbles in the remaining thread.

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gbj_tester in reply to @mespilus

A standard M5 bolt wobbles in the remaining thread.

If the bolt broke, the thread interface was overloaded. You would expect the female thread to be deformed to an oversize condition. You need to replace the nut part as well as the bolt.

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