Strap for Datejust 31 Stainless Steel Domed Diamond / Oyster / White

The Rolex Datejust 31 reference 178344-0051 has a lug width of 16mm. This measurement is specific to the 31mm variant of the Datejust family and is not shared with the 36mm or 41mm models, which use 20mm lug widths respectively. Verifying this dimension before purchasing any aftermarket strap is essential.

For the Datejust 31 178344-0051 in two-tone Rolesor white gold and steel, an alligator strap with vegetable-tanned belly grain is the most coherent aesthetic choice: the natural lustre of the symmetrical scales complements the white gold bezel without creating any discontinuity in finishing. Alternatively, box-calf leather provides a more discreet patina for informal settings, whilst vulcanised rubber is recommended for active use.

To replace the strap on the Datejust 31, a flat-head watchmaker's screwdriver or a dedicated spring bar tool is required to remove the spring bars securing the strap to the lugs. Insert the tool into the lug's side hole, compress the spring and slide the strap free. The operation requires care to avoid scratching the polished case surfaces. Alternatively, Casati Milano offers an in-atelier fitting service.

Yes, numerous aftermarket straps are compatible with the Datejust 31 178344-0051, provided they respect the 16mm lug width and use standard 1.5mm diameter spring bars. Milano Straps offers a curated selection of 16mm straps in various materials — alligator, calf leather, shell cordovan, rubber — all handcrafted and compatible with this reference without any modification to the case.

The lifespan of a leather strap depends on the material and frequency of wear. A quality vegetable-tanned alligator strap, used in rotation and maintained properly — kept away from water and excessive perspiration — retains its structural and aesthetic integrity for 3 to 5 years. Calf leather typically lasts 2 to 3 years. Casati Milano backs its straps with an 18-month warranty against manufacturing defects. Applying a water-resistant spray formulated for luxury leather significantly extends strap longevity.