These tools give general guidance based on common industry rules of thumb. Always confirm load ratings and sizing against the hinge manufacturer's specifications and your local building code before buying or installing.
The logic behind it
Any exposure to salt or chlorine — coastal air, marine use, pools, or chemical/wash-down environments — points to 316, whose molybdenum resists chloride pitting. Indoor and inland-outdoor jobs are well served by 304 at a lower cost. When it's borderline and you value longevity, 316 is the safe default.
Frequently asked questions
What if I'm just over the line from the coast?
If you're within roughly five miles of saltwater, treat it as coastal and choose 316. Salt carries inland on the air.
Is 316 ever the wrong choice?
Only on your wallet — it performs identically to 304 away from salt, so paying for it indoors or inland is wasted money, not a risk.