How would that difference in thread be expressed?
They are all 1mm pitch, the diameters vary. M20 will have a nominal overall diameter of 20mm
Ah, just saw your edit. Yeah I think I need 20mm, but a listing for a 20mm bolt I saw had comprehensive compatibility lists that ruled out most road cranks. Oh well - cheap enough to just order one and see.
@AlexD started
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They are all 1mm pitch, the diameters vary. M20 will have a nominal overall diameter of 20mm