Quote:
Originally Posted by joyridin'
Thought this was interesting. I had the original axles material tested and rockwell tested today.
Material is: 1215
HRc: 41-44 on surface, tester would not go low enough for inside (case hardened)
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If they are 1215 then that explains why they broke. 1215 is a resulphurized free machining steel which is not suitable for structural applications. It has very low strength and harden ability. Make sure the replacements are made from 4340 or 9310 series.