Rolex
Datejust 31 278240-0016— lug 16mm

The Rolex Datejust 31 ref. 278240-0016 has a lug width of 16mm. This is a non-standard measurement within the Rolex range, specific to the Datejust 31 line. Before purchasing an aftermarket strap, it is advisable to confirm the measurement using a digital calliper applied internally between the lugs.

For the Datejust 31 278240-0016 with its Mint Green dial, the most suitable options are: hornback alligator in dark moss green or navy blue for a formal character pairing; shell cordovan for a mirror-like surface that complements the Jubilee bracelet; vegetable-tanned calf leather for everyday wear with a natural patina development over time. The 16mm lug width requires straps specifically calibrated to this measurement.

To replace the strap or bracelet on a Datejust 31, a springbar tool is required to remove the spring bars securing the strap to the lugs. Care must be taken to avoid scratching the Oystersteel lugs. If you are unfamiliar with watchmaking tools, it is advisable to entrust the operation to a qualified watchmaker or to the Casati Milano atelier.

Yes, compatible aftermarket straps do exist, provided they conform to the 16mm lug width. Most generic straps are produced in standard sizes of 18mm, 19mm or 20mm, so compatibility must be verified prior to purchase. Milanostraps.it offers a dedicated selection of 16mm straps compatible with the Datejust 31.

The lifespan of a leather strap depends on material quality and daily use. A well-crafted calfskin strap typically lasts 12 to 24 months with regular wear. Alligator and shell cordovan, owing to the higher density of their fibres, can last 3 to 5 years or more with proper care. Prolonged exposure to water and perspiration significantly reduces longevity; rotating between two straps is the most effective strategy to preserve them.