For bathroom and kitchen hardware, 304 is the better choice; 201 is cheaper but rusts sooner in humid, chloride-exposed settings. They look identical in the store, so the difference only shows up months later. Here is what separates them and when each makes sense.

The core difference: nickel vs manganese

Both are austenitic stainless steels with ~16–18% chromium, so both form a passive protective layer. The difference is what stabilizes it:

  • 304 uses ~8% nickel — a stable, durable passive layer and better all-round corrosion resistance.
  • 201 replaces most of the nickel with manganese and nitrogen to cut cost (nickel is the expensive ingredient), typically only ~1–5% nickel.

In a dry indoor setting the gap is small. In a wet bathroom it grows.

Side-by-side

Property 304 201
Nickel ~8% ~1–5%
Corrosion resistance (humid) Better Lower — surface rust over time
Cost Higher Lower
Best use Wet/structural, long-life Dry, indoor, cost-driven

How to tell them apart

Day one they look nearly identical, but there are signals:

  • The listing — and whether it states a composition. A grade name (“304,” “SUS304”) is a label; a stated composition — “18/8,” i.e. 18% chromium and 8% nickel — commits to the nickel, which is the expensive ingredient and exactly where costs get cut. Prefer hardware that states its composition (KES lists its steel as 18/8). A vague “stainless steel” claim at a suspiciously low price is often 201.
  • A rough visual tell. 304 tends to look brighter and cleaner; 201, with less nickel and more manganese, can read slightly darker — a touch grayish or faintly yellowish. Not definitive, but a dull gray cast is a warning sign.
  • Long-term behavior. 201 tends to show faint surface rust (“tea staining”) first at welds, edges, and where water pools.

Cost vs long-term value

201 wins on upfront price — that’s the whole reason it exists. But for a wet, multi-year fixture, 304’s corrosion resistance usually makes it the better long-term value: you’re buying years of finish life and fewer rust headaches. Pay the 304 premium on the parts that get wet. And when you compare listings, look for the composition claim: “18/8” tells you what is in the steel; a bare grade name does not.

Frequently Asked Questions

Is 201 stainless steel safe?

It’s structurally fine for dry uses; the concern in bathrooms is corrosion and appearance, not safety.

Can I tell 304 from 201 with a magnet?

No — both are weakly magnetic at best; a magnet test is unreliable for distinguishing them.

What does “18/8” mean on a product page?

18% chromium and 8% nickel — the composition that defines 304. A maker that states 18/8 is declaring its nickel content rather than only using the grade name, and nickel is the number that predicts how the steel holds up in a humid bathroom. KES states 18/8 for its steel parts.

Is 304 worth the extra cost?

For wet bathroom and kitchen parts, yes — longer finish life and less rust.