• That’s a bit narrow but it’s not unusual for M6 bolts to be a couple 0.0s of a mm narrower (there’s an ISO somewhere, and it’s probably indicated that the true size can be below 6.0mm; it’s ISO 965, for the curious). I’d guess it’s an M6. Measured an m6 bolt on my desk, it’s 5.84mm.

  • I did my googling and think ISO965 said 5.794mm as the min for M6 so still under (but <1/10mm feels like it could be reasonably feasible in the absence of anything immediately similar - especially given that 0.1mm is also the increment on the caliper)

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