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Bolt resembles an M5 but not the standard M5 thread, possibly finer
#10-32 UNF, 3/16×32TPI BSC, 3/16×32TPI BSF-Whitworth, 2BA
The first should only be found on US manufactured product, the others are candidates if the product is very old and British. An actual fine thread ISO M5 is the least likely, and once you go down that rabbit hole you're into a choice of almost any thread pitch according to the predilections of the engineer who specified it.
gbj_tester
@mespilus
Another broken saddle clamp bolt.
This time it isn't so easily replaceable.
Bolt resembles an M5 but not the standard M5 thread, possibly finer.
It has bamboozled Orbital Fasteners of Rickmansworth.