Rolex
Datejust 31 278275-0032— lug 16mm

The Rolex Datejust 31 reference 278275-0032 has a lug width of 16mm. This measurement is specific to the 31mm case variant and differs from the 36mm version (20mm lugs) and the 28mm version (13mm lugs). Before purchasing an aftermarket strap, always verify the lug gap with a calliper to confirm an exact 16mm fit.

For the Everose gold case of the Datejust 31 278275-0032, a vegetable-tanned alligator strap in tobacco, cognac or bordeaux offers the finest stylistic coherence. Box calf leather is an excellent daily-wear alternative that develops a natural patina over time. In either case, the strap must measure exactly 16mm at the lug end.

To replace the strap on the Datejust 31, use a fine-tipped spring bar tool to release the spring bars securing the strap to the lugs. Work carefully to avoid scratching the Everose gold case. Place the watch face-down on a soft pad and ensure adequate lighting throughout the process. Casati Milano can also perform the swap during a scheduled appointment.

Yes, high-quality aftermarket straps compatible with the Datejust 31 278275-0032 are available. The essential requirement is a 16mm lug width — a less common size compared to the more widespread 18mm and 20mm standards. Milano Straps offers a dedicated selection of 16mm straps in leather, rubber and nylon, crafted to fit Oyster-style lugs without any modification.

The lifespan of a leather strap depends on the material, frequency of use and exposure to perspiration and moisture. A quality vegetable-tanned alligator strap, worn on rotation, typically lasts between three and five years while retaining its structural integrity. Box calf leather develops a characteristic patina within one to two years of regular wear. Keeping the strap away from heat and humidity will significantly extend its service life.