Rolex
Datejust 31 178243-0075— lug 16mm

The Rolex Datejust 31 reference 178243-0075 has a lug width of 16mm. This measurement is taken internally between the two lugs of the case, at the spring bar seating point. It is an essential specification when sourcing a compatible aftermarket strap.

For the Datejust 31 in Yellow Rolesor, a polished alligator strap in cognac or dark brown enhances the two-tone case through its natural belly grain. Shell cordovan is an excellent choice for those seeking a patina that deepens with wear. For less formal occasions, a vegetable-tanned calf leather strap or a NATO-style strap offer quality alternatives without compromising craftsmanship.

Strap replacement requires a dedicated spring bar tool or fork-tip instrument to release the attachment pins. The Datejust 31 lugs feature lateral holes that facilitate the procedure. It is advisable to work on a soft surface to avoid scratching the case, and to ensure the replacement spring bar matches the correct diameter and length for 16mm lugs.

Yes. The Datejust 31 accepts aftermarket straps with a 16mm lug width and standard spring bars. Milano Straps offers a curated selection of handcrafted straps in alligator, shell cordovan, vegetable-tanned calf leather, nylon NATO, and vulcanised rubber, all produced with a 16mm attachment width for full compatibility with this reference.

The lifespan of a leather strap depends on the quality of the hide, daily care, and exposure to perspiration and moisture. A premium alligator or shell cordovan strap, kept away from water and conditioned regularly with appropriate products, will maintain its structural and aesthetic integrity for five to eight years under regular wear. Vegetable-tanned leather develops a distinctive patina that increases its character over time.