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Going to 5/16" thick 316 chainplates was an easy decision since it was the only material available at the time. Plus it seemed that bigger could only be better and 316 has better corrosion resistance. The tables I looked at show 304 and 316 to have the same tensile and yeild strengths but that 304 has slightly better shear strength than 316 (10.7 vs. 11 Gpa). Even it it wasn't the only thing available we still would have opted for the 5/16" 316.
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