The bolts on my 3402Rl Mor/Ryde pin box are 5/8" grade 5 bolts, you can tell that because they have the three slashes shaped like a Y on the head of the bolt. If they were grade 8 bolts they would have 6 slashes, no markings would represent a regular bolt.
Torque should be 135 - 170 lbs.
Hope that helps.
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