Originally Posted by BleedingGreen
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.
Stainless fasteners are available in many grades and far from weak or brittle. Grade tells the whole story. Zinc coatings will chip off just from wrenching and anti seize will give false torque readings. There's a reason why its used so much in aerospace and weapons manufacturing and its not just corrosion resistance.
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