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because they fail at the worst of times. Popular options are grade eight hex cap screws, grade 8 bolts with part of the head ground flat (this is all to accomodate the tight clearance against the sprocket with is not sufficient for a bolt head) and some very very high shear strength roll pins available from Grainger. There are many posts about them, search "roll pin" "shear pin", and "hex cap screw". Mine are held axially with .032" stainless steel safety wire.
My scrambler with new tires easily snaps grade 8 bolts while skid steering at high speed on dry grass.The bolts are 5/16 x 4.roll pins snap easier.I am figuring that this will stop if I stay in mud .I am looking forward to this winter!I figure snow and ice will be much easier on the hub shear bolts
I have an 81 I/C 8x8 argo, I used regular roll pins, but I insert a smaller roll pin inside the original roll pin, so each spot has two roll pins, one inside the other.
Just was talking this with top mechanic, he drills to 3/8" and upsizes grade 8s. I was asking him to key my axles and spockets. The discussion was does does overdrilling weaken the axles too much. Yes, on richard's relics axles (cold rolled bar stock) but no on 2dsmaxalaska axles(made from 4010, says he has not broken one at the bolt in 20 years hauling heavy)
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