Rolex
Datejust 31 178278-0130— lug 16mm

The lug width (ansa width) of the Rolex Datejust 31 ref. 178278-0130 is 16 millimetres. This measurement represents the distance between the lugs on the case and is essential for selecting compatible straps. All aftermarket straps must be shaped and drilled to this precise specification.

The best strap depends on usage and aesthetic preference. For formal elegance, we recommend cognac alligator or burgundy shell cordovan. For daily versatility, vegetable-tanned calf leather or FKM rubber. Compatibility with the yellow gold case requires warm tones: cognac, tobacco, or deep black. Casati Milano creates bespoke custom straps ensuring precision-crafted attachment to the case.

Strap replacement requires a spring bar removal tool and a protected work surface. Position the watch with the strap facing upward, apply gentle pressure to the edge of the spring bar tension with the tool, then extract the pin from the case holes. Insert the new strap aligning the holes, reposition the bar and release the spring. We recommend entrusting this operation to a professional to avoid case damage.

Yes, provided it is manufactured to correct technical specifications. An artisan strap in 16mm lug width with precision-crafted attachments and free from manufacturing defects guarantees the same reliability as an original Rolex strap. Casati Milano provides 18-month warranty on manufacturing defects and uses premium materials (alligator, cordovan, calf leather). Always verify that the lug width corresponds exactly to 16mm.

Longevity varies based on material and usage. Quality artisan alligator resists 4-7 years with daily wear; shell cordovan, being more durable, lasts 8-10 years; vegetable-tanned calf leather 3-5 years. FKM rubber lasts longer, 5-8 years. Factors such as sun exposure, perspiration, humidity and frequency of use influence durability. The natural patina that develops (especially in alligator) is a sign of aesthetic ageing, not functional deterioration.