Rolex
Datejust 31 278245-0024— lug 16mm

The Rolex Datejust 31 ref. 278245-0024 has a lug width of 16mm. This is an intermediate measurement specific to the 31mm case and is not interchangeable with the more common 18mm or 20mm widths found on larger Datejust models. Always verify this measurement before purchasing any aftermarket strap.

For an 18-carat Everose gold case such as that of the Datejust 31, a glossy alligator strap in bordeaux, cognac or tobacco tones offers the most coherent aesthetic match. As an alternative, vegetable-tanned calf leather develops a natural patina over time. For aquatic or sporting use, a vulcanised rubber strap in 16mm is recommended, fully compatible with the model's certified water resistance.

To replace the strap on the Datejust 31, a fine-tipped spring bar tool is required. Insert the tip into the small slot between the lug and the existing bracelet or strap to release the two spring bars. The operation requires care to avoid scratching the gold case. If in any doubt, we recommend consulting a watchmaker or visiting the Casati Milano atelier, where fitting is included as part of the bespoke appointment service.

Yes. Several artisan manufacturers, including milanostraps.it, produce aftermarket straps specifically made to 16mm lug width, compatible with the Datejust 31. It is essential that the strap is manufactured to a precise 16mm width without excessive tolerances, and that 1.5mm spring bars are included or specified. All Casati Milano straps are hand-finished and dimensionally checked prior to dispatch.

The lifespan of a leather strap depends on leather quality, frequency of use and exposure to perspiration and moisture. A high-quality alligator or vegetable-tanned calf strap, worn daily with proper care, typically lasts 2–4 years before requiring replacement. Avoiding direct contact with water, perfume and creams significantly extends its life. Casati Milano provides an 18-month warranty against manufacturing defects on all atelier-made straps.