Nord-Lock Group Publicaties 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

Does Adhesive Works as a Lubricant During Tightening? Chemical thread locking is a traditional solution used against bolt loosening, but does it has the same effect as a real lubricant? Lees verder
The Comparison: Bolts vs Rivets By using Nord-Lock washers, a bolted fastener can overcome many of the disadvantages of rivets, while still offering the advantages of bolts. Lees verder
Comparison of Common Bolt Tightening Methods Tightening methods can be categorized according to the principle of how the preload is generated. The 2 basic principles are rotational tightening and tensioning. Lees verder
The History of the Bolt When were the first bolts made and what were they used for? Nord-Lock Group traces the history of the bolt, from ancient Egypt through to modern day bolts & screws. Lees verder
Mythbusters: If the clamp length is at least five times the bolt’s diameter, then the joint will not loosen from vibration Is that true or false? Lees verder

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