Strap for Datejust 31 Stainless Steel/ Rose Gold / Diamond / Rose - Roman / Jubilee

The Rolex Datejust 31 ref. 278381rbr-0002 features a lug width of 16 millimetres. This measurement is specific to the Datejust 31 model and is calculated centre-to-centre between the spring bars that connect the strap to the case. Any aftermarket strap must comply with this specification for a perfect fit. Other models, such as the Datejust 36, use 20mm lugs, making straps non-interchangeable.

The ideal strap depends on intended use. For formal elegance, black alligator or cognac shell cordovan represent the superior choice: the former offers sharp contrast on the Everose and steel Rolesor, the latter develops exclusive patina over time. Perle grey Derby leather maintains everyday versatility. For a discrete sporty profile, charcoal grey NATO canvas transforms the timepiece whilst respecting its heritage. The 16mm lug width requires compact proportions: avoid straps thicker than 4.5mm to prevent visually overwhelming the 31mm case. Construction quality and finishing should match the watch's internal standards.

Strap replacement requires a spring bar tool, an instrument with two curved ends that compress the elastic tubular bars inward, releasing the strap from the case lug. Position the watch on a soft surface (cloth or pad), gently insert the tool into the gap between case and strap, pushing the bar downward until you feel a small click. The strap separates cleanly. For installing the new 16mm strap, align the hole with the spring bar and press until you hear another click indicating secure retention. Total operation: 3–5 minutes. Alternatively, entrust the service to Casati Milano specialists.

Yes, provided the strap is specifically manufactured for a 16mm lug width. Quality certified aftermarket straps do not damage the Rolex case and offer materials (alligator, cordovan, leather) that Rolex doesn't provide in standard catalogues. Compatibility is guaranteed by correct lug measurement: centre-to-centre between the tubular bars. Avoid generic straps without certified measurement specifications, as they may not fit the lugs or could shift during wear. Milano Straps offers an exclusive collection of certified 16mm straps, crafted in Italian workshops with 18-month warranty.

Longevity depends on material and usage patterns. A shell cordovan strap, treated with natural wax, resists 5–7 years of daily wear before requiring restoration (re-waxing), an operation extending lifespan by another 4–5 years. Alligator, less elastic, lasts 3–4 years under standard conditions. Derby leather offers comparable resistance. Determinant factors: humidity, sun exposure, frequency of use, regular care (gentle cleaning with soft cloth). Casati Milano's 18-month warranty covers manufacturing defects and assembly issues, not natural wear.