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  • Bolt marking "90" meaning

    Discussion in 'The main mechanical design forum' started by adarg, Oct 17, 2013.

    1. adarg

      adarg New Member

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      Hi guys, I am holding a bolt in my hand that has the marking "90" on its head. I am used to 8.8, 10.9 etc grades. Does someone know about this bolt- what it's proof load and characteristics?

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    3. Valmiki

      Valmiki Member

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      I can only guess that it is a special, and that it has a tensile strength of 90 tons/sq inch ??
       

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