Rolex
Datejust 31 278344RBR-0033— lug 16mm

The lug width of the Rolex Datejust 31 reference 278344RBR-0033 is 16mm. This measurement is taken at the inner gap between the two lugs, at the point where the spring bar seats, and is the determining factor for selecting any compatible aftermarket strap.

For the Datejust 31 278344RBR-0033 in white Rolesor with a diamond-set bezel, straps in vegetable-tanned alligator or box-calf leather represent the most coherent choice with the case's aesthetic register. Porosus or Hornback alligator complements the geometry of the bezel, whilst polished box-calf maintains a formal, minimalist profile. A deployant clasp completes the system and preserves the strap over time.

To replace the strap on the Datejust 31, the spring bars connecting the strap to the case lugs must be removed. A dedicated spring bar tool with a curved tip is inserted into the lug hole to compress the spring. Care is required to avoid scratching the white gold case: it is advisable to protect the lugs with PTFE tape or to entrust the operation to an experienced watchmaker.

Yes, compatible aftermarket straps are available for the Rolex Datejust 31, provided the lug width is precisely 16mm and the strap ends are shaped to fit the integrated Oyster lugs correctly. Milano Straps offers a selection of handcrafted 16mm straps in leather, alligator and other materials, finished to a standard befitting the quality of the case. The Casati Milano atelier also provides a fully bespoke made-to-measure service.

The lifespan of a leather strap depends on the material, tanning method and daily use. A vegetable-tanned alligator strap, properly conditioned with suitable products and rotated with other straps, can last between three and six years whilst retaining its grain and structure. Box-calf leather develops a characteristic patina over time but is more sensitive to moisture. Avoiding prolonged contact with water, perspiration and perfume significantly extends the strap's service life.