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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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