Strap for Rolex Datejust 31 278344RBR

The Rolex Datejust 31 in reference 278344RBR is equipped with 16mm lugs. This measurement is determined by the exact distance between the inner edges of the two lugs that connect the case to the strap. The 16mm width is specifically calibrated for the 31mm case, ensuring optimal visual proportion. Any compatible strap must be measured with precision: the attachment holes must correspond exactly to 16mm, with no tolerances accepted.

For the Datejust 31 278344RBR in Rolesor white, alligator remains the most sophisticated and versatile choice. A glossy black alligator emphasises formal elegance, while cognac alligator warms the white gold tone, creating chromatic harmony. Vegetable-tanned calf offers a more compact structure and robustness, ideal for intensive daily wear. Shell cordovan provides maximum durability with an exclusive satin finish. For sporty or summer use, FKM rubber ensures humidity resistance and a modern visual effect.

The Datejust 31 strap is changed using a specialised spring bar remover tool, a small instrument with a flat tip that allows you to compress the spring pins inside the lugs. Position the spring bar remover in the groove of each pin, compress it gently and slide the old strap outward. Insert the new strap, ensuring that the attachment holes are perfectly aligned to the 16mm lug width, and allow the pins to click into place. It is recommended to perform the operation on a soft surface (wool cloth) to avoid scratching the case.

Yes, any leather, rubber or fabric strap with a 16mm lug width is fully compatible. Compatibility depends on three factors: the shoulder width (16mm for this reference), correct positioning of the attachment holes on the spring pins, and sufficient material flexibility to bend slightly during insertion into the lugs. Casati Milano artisanal straps for 16mm lug width are specifically tested for the Datejust 31 and guarantee no anomalous movement between strap and case.

The lifespan of a leather strap depends on the chosen material and usage conditions. An alligator or vegetable-tanned calf, used under normal conditions (not frequent water immersion), provides a useful life of 5-7 years of daily wear. Shell cordovan, due to its extraordinary durability, can exceed 10 years. Natural leather aging contributes to aesthetics (patina) but gradually reduces flexibility; when the strap begins to crease at the wrist edges, it is time to replace it. Excessive humidity, prolonged direct sunlight and frequent salt water contact accelerate wear. All Casati Milano straps are covered by an 18-month warranty against manufacturing defects.