Originally Posted by Patriot Services
Future advice. On spindle mounts, blades or anything else subject to corrosion I use premium bolts. Step up to grade 8 or stainless fasteners. Removing broken bolts is one of my least favorite, avoidable repairs.
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While I like stainless steel hardware for rust related issues, NEVER use stainless in any applications that are under a lot of stress, jarring/jolts, certainly not to hold a spinning mower blade on. Stainless is rather brittle in comparison to other metals and have a tendency to snap or shear off under these conditions. A zinc coated grade 8 bolt with anti-seize is the best option.