You are half right, a lower grade of stainless is less resistant to corrosion. Most bolts and hardware though are Type 304 and DO NOT rust. Must be the marine industry is supplying sub-par components to their customers, or you bought chrome plated fittings under the guise of stainless. But do a search for stainless rusting and you will find that true stainless does not rust. If you have pitting and rust spots, you have chrome!!!!
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