Rolex
Datejust 31 278289rbr-0007— lug 16mm

The lug width of the Rolex Datejust 31 ref. 278289RBR-0007 is 16mm. This measurement should be taken between the two case lugs at the point of strap attachment using a calliper. It is a specific size requiring straps manufactured precisely to 16mm to ensure a correct fit without lateral play.

For a white gold case with a ruby-set bezel, a glossy alligator strap in bordeaux or midnight blue provides the best aesthetic balance, complementing the cool tone of the metal. Vegetable-tanned shell cordovan is the alternative for those seeking a compact surface and a long-lasting patina. In both cases, a deployant clasp in white gold or polished steel is preferable to a standard buckle to preserve the strap's shape over time.

The strap on a Rolex Datejust 31 is removed using a spring bar tool or a 1.5mm replacement pin to release the spring bars securing the strap to the lugs. Care must be taken to avoid scratching the white gold case: it is advisable to protect the lugs with soft adhesive tape or to entrust the replacement to a watchmaker or the Casati Milano atelier.

Yes. Compatible aftermarket straps must have a 16mm attachment width and standard 1.5mm spring bars. Milano Straps produces and selects handcrafted straps specifically for this size, available in alligator, calf leather, shell cordovan, and technical materials. Each strap is adaptable to both a standard buckle and a deployant clasp.

The lifespan of a leather strap depends on the material and daily use. A quality alligator or shell cordovan strap, with proper maintenance — avoiding prolonged exposure to water and perspiration, and occasionally applying a neutral conditioner — will maintain structural and aesthetic integrity for 3 to 5 years of regular wear. Casati Milano straps carry an 18-month warranty against manufacturing defects.