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sometimes harder is NOT better,,the harder they are,, they are also more brittle..making them prone to snap instead of give ,or flex.. this would make them a safety issue and certainly a big issue on suspension or any other parts that you would bet your life on...bolts snapping ,,suspension falling out at 100 m.p.h. would ruin your day ,,if not your life..
grade 3- too soft 5-8- best gr.12-too much ...
.....at least that's the way i understand it....
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