The Steel Grade Question
If you've spent any time researching watch links or aftermarket bracelet components, you've probably come across the terms 316L and 904L stainless steel. Rolex famously switched to 904L for its watches and bracelets. But what does that actually mean, and does the grade matter for watch links specifically?
What Is 316L Stainless Steel?
316L is the most common grade of stainless steel used in watchmaking and watch accessories. The 'L' stands for low carbon, which improves weldability and corrosion resistance compared to standard 316. It contains chromium, nickel, and molybdenum - the molybdenum being the key additive that makes it highly resistant to chloride corrosion (i.e., saltwater).
316L is used by: TAG Heuer, Omega, IWC, Breitling, Tudor (on many models), and the vast majority of aftermarket watch component manufacturers.
It's an excellent material. Durable, corrosion-resistant, takes a great polish, and highly biocompatible for skin contact. There's a reason it's the industry standard.
What Is 904L Stainless Steel?
904L is a super-austenitic stainless steel with significantly higher chromium and nickel content, plus the addition of copper. It's typically used in highly corrosive industrial environments- chemical processing plants, for instance. In watchmaking, Rolex is its most famous adopter.
904L advantages over 316L:
- Higher corrosion resistance, particularly against acids
- Slightly harder, which means it holds a polished finish longer
- More scratch-resistant over time
The trade-offs: 904L is harder to machine, which makes it more expensive to work with and typically means it's only cost-effective at scale (i.e., Rolex-level production volumes).
Does It Matter for Watch Links?
Honestly? For most everyday wearers, the practical difference is minimal. Both grades are extremely corrosion-resistant under normal wear conditions - sweat, rain, brief water exposure. Unless you're regularly swimming in highly chlorinated pools or seawater for extended periods, 316L will perform excellently and is effectively indistinguishable to the eye.
Where 904L does make a genuine difference is in long-term finish retention. The slightly greater hardness means fine polished surfaces stay sharper for longer. If you're the kind of person who notices micro-scratches forming on brushed surfaces and it bothers you, 904L has an edge.
What Does Steel Reef Use?
Our links are precision-machined from high-grade stainless steel, engineered to be colour-matched and finish-matched to the original bracelets they're designed for. Each product listing specifies the grade used. For Rolex-compatible links, we ensure the finish characteristics and dimensional tolerances match what you'd expect from an Oystersteel bracelet.
Browse our range of precision-machined watch links:
