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Myth: The higher the bolt grade, the lower the stretching ability of the bolt.
Truth: whatever their grade, bolts made from the same material have the same modulus of elasticity E:
According to the law of Hooke, the stretching ability of a material depends on its modulus E while its stress σ and elongation ε are linked as follows: σ=E x ε. Therefore, the higher grade means the same elongation under the same force for the same bolt sizes, but a greater load can be supported before yielding or breaking.
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