Another idea which I have seen used is to place a spacer on the outside of the bolt and use a longer bolt. When you torque a bolt, you are counting on the stretch of the fastener to maintain tension. The shorter the bolt is means it will yield to shock load and fatigue sooner. A 5/8 bolt may require an additional inch or two spacer. Using a harder grade bolt some times is not the correct answer when dealing with stress failure as they will snap, rather than stretch and return to the proper tension.
Check out some final drive components made by the heavy equipment manufactures and you will see the application of longer bolts and spacers to overcome shock loads on fasteners.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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