July 2026
An in-depth look at 904L stainless steel vs 316L — corrosion resistance, polishing characteristics, weight feel, and why RICH Factory uses genuine 904L steel for all its Rolex super clone timepieces.
904L stainless steel, also known as Oystersteel in Rolex terminology, is an austenitic stainless steel alloy that contains higher levels of chromium, nickel, and molybdenum compared to the industry-standard 316L steel. Specifically, 904L contains approximately 23-28% chromium, 19-23% nickel, and 4-5% molybdenum, whereas 316L typically contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum. These higher alloying elements give 904L steel superior corrosion resistance, particularly against chlorides and acids. This makes it ideal for a watch that will be exposed to seawater, sweat, and everyday wear.
The differences between 904L and 316L go beyond just chemical composition. When polished, 904L steel exhibits a noticeably brighter, whiter shine compared to the slightly warmer tone of 316L. This is because the higher nickel content gives 904L a more reflective surface. Under a loupe, the difference is subtle but perceptible to trained eyes. Additionally, 904L is approximately 2-3% denser than 316L, meaning a watch case machined from 904L will feel slightly heavier on the wrist. For replica buyers who want the most genuine-feeling experience, this weight difference matters.
The vast majority of replica watch factories use 316L stainless steel for a simple reason: cost and machinability. 904L steel is approximately three times more expensive than 316L, and it is significantly harder to machine. The higher nickel content makes 904L tougher on cutting tools, requiring slower machining speeds and more frequent tool changes. This drives up production costs considerably. Most replica manufacturers opt for 316L to keep prices competitive, even though it means their cases lack the same brightness and corrosion resistance as genuine Rolex watches.
RICH Factory is one of the few replica manufacturers that uses genuine 904L stainless steel across its entire product line. Every RICH Factory watch — from the Submariner to the Daytona to the Datejust — uses 904L steel for the case, bracelet, and clasp. This commitment to material accuracy is one of the key factors that sets RICH Factory apart from competitors like VSF and Clean Factory, which use 316L steel. The result is a replica that not only looks like the genuine article but also feels like it on the wrist.
Over time, 904L steel maintains its appearance better than 316L. The higher chromium content creates a more stable passive oxide layer that resists pitting and discoloration. While both steels will show fine scratches from daily wear, 904L steel can be polished back to its original luster more easily. For collectors who plan to wear their replica regularly, this long-term appearance retention is a significant advantage. Many RICH Factory owners report that their watches continue to look excellent even after years of regular wear.
If you want to verify that your watch is genuinely 904L steel, the most reliable method is a professional XRF analyzer test. However, there are some practical indicators. 904L steel is slightly heavier than 316L — a full watch will feel about 5-10 grams heavier. The surface polish under bright light will appear whiter and more reflective. And 904L steel is more resistant to saltwater corrosion — if you accidentally expose your watch to seawater, 904L will show less discoloration than 316L.
Yes. Every RICH Factory replica uses genuine 904L stainless steel for the case, bracelet, and clasp components. This applies to all models including Submariner, Daytona, GMT, Datejust, and Explorer.
For buyers who value accuracy and longevity, yes. 904L steel offers superior corrosion resistance, a brighter polish, and slightly heavier weight that more closely matches the genuine Rolex feel.
The difference is subtle but noticeable when comparing side by side. 904L has a whiter, brighter polish while 316L appears slightly warmer in tone. The weight difference of 5-10 grams is also perceptible.