Yes, there are codes for this. However they involve mathmatics for you to utilize them,... and for you to ask this question shows some education needed....
304 stainless can mean so much, be specific, manufacturer, state, location and time of manufacturing.
Also look at the storage time and conditions of the stock. I fthe world was perfect than 304 would be also!!
Look to the ground-based technology references, this deals with natural securement and not mechanical.
In fastenind anything to the earth, you must remember the earth is round and not square....