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Glossary

Oystersteel

A plain-language definition of Oystersteel — what it is and why it matters on a Rolex.

Oystersteel is Rolex's name for the 904L stainless steel it uses across its Oyster watches. More corrosion-resistant and harder to machine than the 316L steel most brands use, it takes an exceptionally bright polish and stands up to sweat, salt water, and chemicals.

Why Rolex uses it

Most of the watch industry uses 316L stainless steel. Rolex switched its steel watches to the 904L alloy — which it brands Oystersteel — for its superior resistance to corrosion and pitting, especially from salt water and acids. The trade-off is that 904L is significantly harder to machine and finish, which is part of why Rolex brought steel processing in-house.

The practical benefit to an owner: an Oystersteel case holds its high-polish and satin finishes beautifully over decades and shrugs off the sweat-and-saltwater life of a dive or daily watch.

Oystersteel FAQ

Oystersteel, answered.

What is Oystersteel?

Oystersteel is Rolex's branding for 904L stainless steel, used across its Oyster watches. It resists corrosion better than the common 316L steel and takes a brighter polish.

Is Oystersteel better than normal stainless steel?

For corrosion resistance and finish, yes — 904L outperforms the industry-standard 316L, particularly against salt water and acids. It is also harder and more expensive to work.