Strap for Rolex Datejust 31 278248

The Rolex Datejust 31 reference 278248 is fitted with a 16mm lug width. This is the exact internal distance between the two lugs (or spring bars) where the strap connects to the case. The 16mm specification is shared with other Datejust 31 versions and facilitates compatibility with high-quality aftermarket straps.

The choice depends on intended use and aesthetic preference. For maximum elegance, hand-dyed alligator with vegetable tanning is the ideal choice, developing a rich patina over time. German calf leather of superior thickness (Fjord, grained) offers daily versatility whilst maintaining excellent build standards. Shell cordovan is exceptional if water resistance and inherent lustre are desired. For sporty contexts, FKM rubber is the most practical solution.

Strap replacement requires removal of the existing strap and insertion of the new strap through the case lugs. We recommend entrusting this operation to a competent watchmaker to avoid risk of case or lug damage. New 16mm straps must be measured with precision to ensure correct comfort and wrist fit, considering both circumference and generosity in the buckle zone.

Yes, all straps with 16mm lug width are compatible with the Datejust 31 278248. Artisanal quality straps — such as those offered by Casati Milano — guarantee greater aesthetic and constructive flexibility compared to factory straps, with the possibility of customising colour, material and buckle type (deployante, standard buckle, etc.).

The lifespan of a leather strap depends on usage, climate and material quality. A superior quality alligator or vegetable-tanned calf strap can last 3–5 years of daily wear, developing a fascinating patina. Shell cordovan, thanks to its moisture resistance, tends to last slightly longer. All Casati Milano straps benefit from an 18-month warranty against manufacturing defects, regardless of natural wear.