Derive hex head size from bolt size?

I need a nut that will fit an M12 x 1.75 bolt

It also needs to be 19mm hex head size.

The problem is that none of the eBay sellers are saying what the size of the head is. So is the reason they are omitting this information because it's obvious? Is there a chart somewhere that tells you what size the head needs to be given the bolt size?

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