High strength structual bolts has a large bolt head and nut as it is designed to withstand full tensioning. 8.8/s high strength structural bolts fully tensioned bolts that are used snug tight, 8.8/tf high strength structural bolts full tensioned friction type joint, 8.8/tb high strength structural bolts fully tensioned bearing type joint,
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Jam nuts, cotter pins, lock nuts, lock washers and similar devices also prevent the loss of the bolt or nut by back off but they result in added weight, inconvenience and cost. they do not reduce the tendency to fatigue when loose. further, the insecurity of conventional mechanical locks are reason enough for most designers to reject them. such
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