Rolex Oystersteel is the brand's name for 904L stainless steel: a high-alloy, low-carbon steel with more nickel, chromium and molybdenum than the 316L used by most watchmakers, plus a little copper. Rolex began using 904L in the 1980s and adopted the Oystersteel name in 2018, so the two terms describe the same family of metal on the wrist. This guide explains what the alloy contains, how it compares with 316L, and what it means for the steel references you may be weighing. Bizak & Co. is a sourcing desk, not an authorised Rolex retailer, and every watch mentioned here is sourced to order.
Last reviewed on October 28, 2026 by Filip Biczak. Sources: Rolex, Oystersteel and Rolex, watch care and service.
Is Oystersteel the same as 904L steel?
In practice, yes. Oystersteel is the name Rolex gives to its 904L stainless steel, and the company has used 904L in its steel watches since the 1980s. The branded name arrived in 2018, when Rolex began describing its steel this way in its own material. Rolex does not publish a full recipe, so treat the percentages in this article as typical figures for the 904L grade, not a Rolex specification. What is certain is that the steel is a 904L-type alloy, and that Rolex melts and works it in its own foundry in Switzerland.
What is 904L steel made of?
904L is an austenitic stainless steel with a very low carbon content and a heavy dose of alloying elements. Typical ranges are roughly 19 to 23 percent chromium, 23 to 28 percent nickel, 4 to 5 percent molybdenum and 1 to 2 percent copper. Chromium forms the thin protective oxide layer that makes steel stainless, molybdenum helps it resist pitting, and copper improves resistance to certain acids. The grade was developed for chemical plants and seawater equipment, long before watchmakers noticed it.
How does Oystersteel compare with 316L?
Oystersteel is more corrosion resistant than 316L and costs more to make and machine, which is why few brands use it. 316L is the standard watch steel and a sound material, but it carries far less nickel and molybdenum and has no copper. The table sets out the typical differences.
| Attribute | Oystersteel (904L) | 316L |
|---|---|---|
| Type | High-alloy austenitic stainless steel | Standard austenitic stainless steel |
| Chromium (typical) | About 19 to 23 percent | About 16 to 18 percent |
| Nickel (typical) | About 23 to 28 percent | About 10 to 14 percent |
| Molybdenum (typical) | About 4 to 5 percent | About 2 to 3 percent |
| Copper | About 1 to 2 percent | None added |
| Corrosion resistance | Higher, especially against chlorides and acids | Good for everyday use |
| Machining | Harder to cut and polish | Easier and cheaper |
| Used by | Rolex steel watches, a few other makers | Most watch brands |
Why does the alloy matter on the wrist?
The alloy matters most for corrosion resistance and for how the case finishes. Sweat, sea air and chlorinated pools attack weaker steels over years, and a higher-alloy steel holds up better against that kind of exposure. Rolex also points to the way Oystersteel takes a polish, which gives the case and bracelet a bright, lasting finish. None of this means the watch cannot scratch: steel is softer than the sapphire crystal and the ceramic bezel, so day-to-day marks still appear, and an Oystersteel case ages like any other.
Is 904L harder to work, and does that affect servicing?
Yes, 904L is tougher on tools, so cases and bracelets cost more to produce, and that cost is one reason other brands stay with 316L. For an owner, the practical point is that polishing removes metal. Edges and lug chamfers stay sharp on a case that has been polished lightly or not at all, so ask for close photographs before you buy any pre-owned watch. Confirm service history with the seller and with Rolex's own guidance on care.
Which Rolex models use Oystersteel?
Every current Rolex steel model uses Oystersteel, and the main sports and everyday lines are the ones buyers ask us about most. Browse the Rolex Submariner references for the dive watch, the Rolex Daytona models for the chronograph, and the Rolex GMT-Master II watches for the travel watch. The Rolex Datejust references, the Rolex Explorer models and the Rolex Oyster Perpetual watches cover the dress and everyday end. Use the from-prices on the linked listings as a guide only, because they move and a sourced unit may price differently.
Two cautions. First, not every Rolex is steel: gold and platinum watches use their own metals, and two-tone models combine Oystersteel with gold. Second, a vintage Rolex made before the 1980s was usually cased in 316L, so the Oystersteel story starts with newer watches. If you want to compare how the two everyday lines differ beyond the case, read our guide to the Rolex Oyster Perpetual vs Datejust, or see how the best-known steel dive watch splits into Submariner Date vs no-date versions.
How do you look after an Oystersteel Rolex?
Rinse it with fresh water after the sea or a pool, wipe it dry, and clean the bracelet gently with a soft brush and mild soap while the crown is screwed down. Avoid harsh solvents, and have the watch serviced on the schedule Rolex recommends. Oystersteel needs less fuss than many steels, but the gaskets and crown seals are the parts that fail first, so water resistance depends on servicing, not on the alloy.
Quick answers
Is Oystersteel just 904L steel?
Oystersteel is Rolex's name for its 904L stainless steel. Rolex has used 904L in its steel watches since the 1980s and introduced the Oystersteel name in 2018. Rolex does not publish the exact composition, so the figures here are typical for the 904L grade.
Is 904L better than 316L?
For corrosion resistance, yes: 904L has more nickel, chromium and molybdenum, plus copper, so it resists pitting and acids better. 316L is still a sound and widely used watch steel, and the difference is most visible over many years of exposure.
Does Oystersteel rust or tarnish?
It is designed to resist rust and staining, and in normal wear it should not rust. Surface scratches and wear are still possible, and neglected seals or heavy chemical exposure can cause problems that no alloy prevents.
Do all steel Rolex watches use Oystersteel?
All current Rolex steel models use it. Older watches from before the 1980s were mostly cased in 316L, and two-tone and gold models use other metals for part of the case and bracelet.
Does Oystersteel affect the price of a Rolex?
The alloy is one cost in the watch, but price is driven by the model, condition, year and demand more than by the steel. Compare the from-prices on the linked listings for the reference you want.
Related reading: how Rolex Cerachrom ceramic bezels differ from aluminum.
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