Rolex
Datejust 31 178344-0007— lug 16mm

The lug width of the Rolex Datejust 31 reference 178344-0007 is 16 millimetres. This dimension is specific to the 31mm Datejust case and is not compatible with other Rolex references of different sizes. Measurement is performed by placing a digital calliper perpendicularly inside the lug, measuring the distance between the attachment holes. An incorrect measurement compromises the strap's compatibility.

For the Datejust 31 178344-0007 with Rolesor case (stainless steel and white gold) and mother-of-pearl dial, an alligator strap with vegetable tanning is the premium choice: it enhances the material contrast between organic leather and metal, developing natural patina over time. Vegetable-tanned calf leather represents the sober and versatile alternative. For extreme durability and noble patina, shell cordovan is unrivalled. The ideal thickness is 4–4.5 millimetres to preserve the visual proportions of the case.

The strap is changed using a two-ended spring bar tool. Position the small end of the tool in the internal hole of the lug, gently push upward to release the spring pin. Repeat on the opposite lug. Remove the strap and insert the new one by aligning the pins with the holes. Push until you hear an audible click. If you prefer to avoid the risk of scratches, Casati Milano offers a strap-change service in-atelier with inspection of the attachment mechanics.

Yes, the Rolex Datejust 31 178344-0007 is fully compatible with aftermarket artisanal straps of 16mm lug width. It is crucial that the strap be specifically manufactured for this width: a 14mm or 18mm strap cannot be installed. High-quality straps, such as those crafted by Casati Milano in alligator, calf leather or shell cordovan, often deliver aesthetic and construction results superior to OEM Rolex straps, with customisation options for leather type, finishing and deployante clasp.

The lifespan of a leather strap depends on the material, tanning method and intensity of wear. A high-quality vegetable-tanned alligator strap, worn daily, has an average life of 3–5 years before replacement is necessary due to visible wear. Shell cordovan, owing to its structural resistance, can last 8–12 years. Vegetable-tanned calf leather offers intermediate durability of 4–6 years. The patina developed by natural tanning testifies to elegant ageing, not degradation. Casati Milano provides an 18-month warranty against manufacturing defects and offers restoration and regeneration services to extend the strap's lifespan.