Rolex
Datejust 31 278285rbr-0029— lug 16mm

The Rolex Datejust 31 ref. 278285rbr-0029 has a lug width of 16mm. This measurement is taken on the inside of the lugs, at the strap attachment point. Using the correct dimension is essential to ensure proper spring bar fitment and precise visual symmetry between strap and case.

For the Datejust 31 in Everose gold, the most suitable materials are vegetable-tanned alligator belly — prized for its natural texture and patina development over time — and shell cordovan for a sleek, compact grain. Both complement the warm tones of rose gold. The buckle or deployant clasp should be in 18-carat rose gold to maintain metallic coherence with the case.

To replace the strap on the Datejust 31, you need to remove the spring bars connecting the strap to the 16mm lugs. Use a dedicated bifurcated spring bar tool. Rest the case on a soft cushion, compress the spring bar inward toward the lug and slide the strap free. Care must be taken to avoid scratching the Everose gold lugs during the operation.

Yes, high-quality aftermarket straps compatible with the 16mm lug width of the Datejust 31 are available. Milanostraps.it offers a curated selection of handcrafted leather straps made to fit the 16mm attachment with standard spring bars. Casati Milano also produces fully bespoke straps by appointment, with personal leather selection and artisanal construction.

The lifespan of a leather strap depends on the material, tanning method and care routine. An alligator or shell cordovan strap with vegetable tanning, kept away from prolonged water and sweat exposure and periodically conditioned, can last between 3 and 7 years while retaining structural and aesthetic integrity. Casati Milano straps carry an 18-month warranty against manufacturing defects.