Quote:
Originally Posted by glypo
How? It takes it away.
Just got in from work and I'm doing maths again already....
M3 = Nominal diameter 3 mm
M4 = Nominal diameter 4 mm
Stress = Force / Area
Therefore stress is inversely proportional to area.
Circumference = pi x d
M3 = 3.14 x 3 = 9.42 mm
M4 = 3.14 x 4 = 12.56 mm
Obviously this is a 33.3% increase in surface area, thus stress around the screw will drop by 33.3% also. So therefore the stress will be reduced on the housing with a bigger bolt.
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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
