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What is the yield strength of bolt of class 4.6?

a) 400 N/mm2
b) 240 N/mm2
c) 250 N/mm2
d) 500 N/mm2

Answer: b
Explanation: For class 4.6, ultimate strength = 4×100 = 400 N/mm2
yield strength / ultimate strength = 0.6
yield strength = 0.6×400 = 240 N/mm2.

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