Rolex
Datejust 31 278240-0003— lug 16mm

The Rolex Datejust 31 278240-0003 has a lug width of 16mm. This measurement is specific to the 31mm case diameter and requires straps with curved ends to correctly follow the curvature of the Oyster lugs.

For the Datejust 31 278240-0003, alligator hornback or shell cordovan straps are the most appropriate choices given the model's formal character. Box calf leather with vegetable tanning suits everyday wear, while rubber and NATO straps adapt well to casual or sportier contexts. All options must feature a 16mm lug width and curved ends.

To replace the strap on the Datejust 31 278240-0003, use a spring bar tool to remove the 16mm spring bars from the lugs. Take care not to scratch the Oystersteel case: protect the lugs with soft tape and work on a padded surface. Alternatively, a watchmaker or the Casati Milano atelier can carry out the swap professionally.

Yes, a wide range of quality aftermarket straps are compatible with the Rolex Datejust 31 278240-0003. The essential technical requirement is a 16mm lug width with curved ends to respect the Oyster lug geometry. Milano Straps offers a curated selection of handcrafted 16mm straps in various materials, all compatible with this reference.

The lifespan of a leather strap for the Datejust 31 depends on the material and maintenance. A high-quality alligator strap, with regular use and proper care — avoiding prolonged moisture exposure and conditioning every 3–4 months — can last between 3 and 5 years. Shell cordovan tends to last longer thanks to its dense fibrous structure. Vegetable-tanned calf leather straps have an average lifespan of 2–3 years with daily use. Milano Straps provides an 18-month guarantee against manufacturing defects on all its straps.