High Tensile Sprocket Bolts

[Trent B]

As Don said you want bolts with a higher shear force rather than tensile force, and partially threaded is better than fully threaded. From a partially threaded standpoint you want as few threads between the bolt head and the nut as possible (eg get as few as possible to have a tight fit) because each thread acts as a crack and the stress from shear force will concentrate their increasing the odds of failure.

Additionally make sure the change in stress as the wheel rotates is at the minimum for each bolt (eg center the sprocket well, evenly tightened bolts etc.) Fatigue or failure as a result of changing stress amplitude through a cycled application is one of the leading causes of failure in parts.