I am currently looking for materials to produce some 3mm and 4mm shafts from. These will range from 50 to 80 mm in length. The shafts will be exposed to the elements, mostly dirt and water. I am afraid that the stainless will not have enough strenth compared to say a grade 5 steel bolt. But I have not found a steel alloy with enough corrosion resistance other than stainless. Currently 303 stainless is being considered becouse it is free machining. The shaft will experiance shock loads of up to 50lbs over a 25 mm area that is in double shear.
Any Ideas if the SS will hold up or is there a better steel to use that would be somewhat corrosion resistant.
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