In most bolted joints it is the clamping force and resulting friction that holds the load, not the shear strength of the bolt. Unless you're talking about a true shear bolt application the bolt should not be in shear loading. If it gets into this condition it means the joint is loose, the clamp load is lost, and regardless of the grade of bolt it is bound to fail. The benefit of a higher grade bolt is it allows for increased torque which translates into increased clamp load. If you have space to do it try putting several hardened plain washers under the head of the bolt to increase the shank length that is available to stretch - this is also a common way of increasing the integrity of a bolted joint.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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