The difference is coating vs material. Zinc plating is a thin sacrificial layer that wears; hot-dip galvanizing is a thicker, tougher zinc coat; stainless resists corrosion through the metal itself. For anything outdoors or damp, stainless lasts longest — 316 near salt.
Zinc-plated hinges
Zinc plating is a thin electroplated layer over steel — cheap and fine for dry indoor use. But it's sacrificial: once the coating wears or scratches through, the steel underneath rusts. Zinc-plated hinges belong indoors, not on exterior or damp doors.
Hot-dip galvanized hinges
Hot-dip galvanizing dips the steel in molten zinc for a thick, rugged coating that lasts far longer outdoors than plating. It's a solid budget choice for gates and outbuildings, with an industrial look. The catch is the same in principle: it's still a coating, and once it's worn or damaged at an edge, corrosion can start.
Stainless hinges
Stainless resists corrosion through the alloy itself — scratch it and the passive layer reseals. There's no coating to wear off. 304 handles dry and inland exposure indefinitely; 316, with added molybdenum, handles salt and chlorine. It costs more up front but doesn't have a coating clock ticking.
Which to use
- Dry indoor → zinc-plated is fine and cheapest.
- Outdoor budget, inland → hot-dip galvanized or 304 stainless.
- Coastal, pool, marine, or buy-it-once → 316 stainless.
- Always match fastener material to the hinge to avoid rust streaks and galvanic corrosion.
Frequently asked questions
Is galvanized as good as stainless outdoors?
Hot-dip galvanized lasts well outdoors and costs less, but it's a coating — once worn or chipped, the steel can rust. Stainless resists corrosion through the metal, so it lasts longer, especially near salt.
Will zinc-plated hinges rust outside?
Yes, fairly quickly. Zinc plating is thin and sacrificial; outdoors it wears through and the steel rusts. Use galvanized or stainless outside, not zinc-plated.