Stainless Steel Grade

A purchasing agent from Pine Grove says:
I have a few of these springs that have slight rusting. What is the grade of the stainless steel?
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Paul from SWISCO responded:
That's an interesting question. Let's see if this helps: the springs come from Adept. The item description from Adept reads "stainless steel 300 Series Full Hard". Do you need to know anything else about these springs?
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