株式会社ノルトロックジャパン | NORD-LOCK GROUP BOLTEDブログ Do Higher Grade Bolts Have Lower Stretching Ability?

Do Higher Grade Bolts Have Lower Stretching Ability?

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:

  • For carbon steel bolts (ISO 898-1): E=210 kN/mm2.
  • For stainless steel bolts (ISO 3506-1): E=170 kN/mm2.

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.

More insights and references

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【特集】ボルトの歴史を辿る ボルト。それは一見、モノを固定するためのとても単純な製品のように見えます。しかし、深く掘り下げてみると、取るに足りないように見えるボルトとねじの背景には、多くのドラマが積み重なった濃密な歴史がありました。ボルトの歴史は、そのまま人類の産業史と重なって来るのです。 詳細
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