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What is the yield strength of the bolt of class 4.6?


1. 400 N/mm2
2. 240 N/mm2
3. 250 N/mm2
4. 500 N/mm2

1 Answer

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Best answer
Correct Answer - Option 2 : 240 N/mm2

Explanation:

Bolts are classified as grade x. y where 

  • x represents 1/100th of ultimate tensile strength and
  • y represents the ratio of yield stress to ultimate tensile stress.


For a bolt of grade 4.6 implies that:

Ultimate strength, fu = 4 x 100 = 400 N/mm2

Yield strength, fy = 0.6 x ultimate strength = 0.6 x 400 = 240 N/mm2

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