Rolex
Datejust 31 278241-0018— lug 16mm

The lug width of the Rolex Datejust 31 ref. 278241-0018 is 16mm. This measurement is taken by placing a digital calliper between the inner walls of the lower lugs on the case. It is a dimension specific to this 31mm family, distinct from the Datejust 36 (20mm) and the Lady-Datejust 28 (13mm).

For the Datejust 31 278241-0018 in Rolesor Everose, a palmate-grain alligator strap in bordeaux or cognac is the most coherent choice for the watch's formal register. Alternatively, vegetable-tanned box-calf leather develops a natural patina over time, while shell cordovan offers a tight grain and natural lustre. All straps must feature a 16mm lug width with curved ends to accommodate the Rolex Oyster lug geometry.

To replace the strap on the Datejust 31, you will need a spring bar tool with a 1.8mm tip. Insert the tool into the lateral groove of the lug to compress the spring bars and release the strap. It is advisable to work on a soft watchmaker's mat to protect the Rolesor Everose case from scratches. If this is your first strap change, having a watchmaker perform the operation is recommended.

Yes. The Datejust 31 ref. 278241-0018 uses standard 16mm spring bars, making it compatible with any quality aftermarket strap in that lug width. milanostraps.it offers handcrafted straps in alligator, calf leather, shell cordovan and rubber, with curved ends designed for the Rolex Oyster lug profile. The recommended standard length is 115/75mm for average female wrists.

Longevity depends on the material and conditions of use. A high-quality alligator strap, rotated with other straps and kept away from prolonged moisture, will typically last 3 to 5 years before showing structural wear. Vegetable-tanned calf leather develops character through patina but may deteriorate more quickly with frequent perspiration. Casati Milano straps carry an 18-month guarantee against manufacturing defects; with proper care (leather conditioner every 3–4 months), the useful life is significantly extended.