Quote:
Originally Posted by Oliv996
The ration between M3 and M4 is quite still the same but you must consider the core diameter of the screw: 2.5 for M3 and 3.3 for M4 
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Quote:
Originally Posted by glypo
M3 = Nominal diameter 3 mm
M4 = Nominal diameter 4 mm
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The key is in detail. Never clever to correct someone without reading their post. I was clearly referring to the nominal diameter of the screw body.