Rolex
Datejust 31 178341-0002— lug 16mm

The Rolex Datejust 31 ref. 178341-0002 has a lug width of 16mm. This is the standard Rolex measurement for 31mm Datejust cases. To verify it, use a calliper to measure the internal distance between the two lugs at the point where the strap attaches to the case back.

For the Datejust 31 in Everose Rolesor, the most coherent materials are porosé alligator leather in bordeaux or cognac, shell cordovan in burgundy or black, and vegetable-tanned calfskin in tobacco or sand tones. These respect the warm chromatic hierarchy of the Everose gold and steel bimetal. A deployant clasp in rose gold optimises comfort and protects the leather at the buckle point.

The Datejust 31 integrated bracelet is removed by pushing out the 1.5mm fixing pins located in the lugs using a dedicated watchmaker's spring bar tool. It is advisable to rest the case on a dedicated cushion to avoid scratches to the case or case back. Alternatively, Casati Milano offers an in-atelier strap replacement service.

Yes. Any aftermarket strap with a 16mm lug width is compatible with the Datejust 31 ref. 178341-0002, provided it matches the curvature profile of Rolex lugs. Milano Straps offers a selection of 16mm straps in various materials and finishes, with customisable tapering and buckles in steel or rose gold.

Longevity depends on material and usage. A quality alligator or shell cordovan strap, with regular conditioning (leather cream every 2–3 months, avoiding prolonged exposure to water and perspiration), will maintain structural and aesthetic integrity for 3–5 years of daily wear. Vegetable-tanned calfskin develops a patina over time but is more susceptible to moisture. The Milano Straps guarantee covers manufacturing defects for 18 months.