When I've worked with these wet bolts, there is no case hardening of them, and even if there were, the hardening would only be very shallow at the surface. Even the grease passage is very small diameter which should not have much effect on its strength. The bolts can be black oxide treated or plated to help prevent corrosion.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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