When did M12 become 18mm across the flats, rather than 19mm?
When you moved out of Germany; DIN says 19mm, ISO says 18mm
lol
But fasteners have to be EN 15048, so ISO dims.
And ISS have stopped making the 18mm podger, that they once did.
Not as head-scratching as BB standards, but really...
@Scilly.Suffolk started
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When you moved out of Germany; DIN says 19mm, ISO says 18mm