Rolex
Datejust 31 278274-0017— lug 16mm

The Rolex Datejust 31 278274-0017 has a lug width of 16mm. This measurement is specific to the Datejust 31 family and differs from the 36mm and 41mm variants, which use 20mm lugs. For a correct fit, straps with a 16mm end width must be used without adapters.

For the Datejust 31 in white Rolesor, the most suitable straps are alligator with hornback or square scale grain for formal occasions, or vegetable-tanned calf leather for daily wear. Shell cordovan is the optimal choice for those seeking durability and resistance to deformation. In all cases, the lug width must be exactly 16mm.

To replace the strap, a fine-tipped spring bar tool of 0.8–1mm is required, compatible with the integrated spring bars in the Datejust 31 lugs. Compress the spring bar on one side, release the strap, and insert the new one. The operation should be carried out on a soft surface to avoid scratching the steel and white gold case. If in doubt, it is advisable to consult a watchmaker or a specialist atelier.

Yes, high-quality aftermarket straps specifically produced for 16mm lugs are available and compatible with the Datejust 31 278274-0017. Milano Straps offers a selection of handcrafted straps in various materials — alligator, calf, cordovan, rubber — produced with curved or flat ends depending on the version. It is essential to verify the lug profile before purchase to ensure a precise fit.

The longevity of a leather strap depends on the material and care. A quality alligator strap, with moderate daily use, maintains structural integrity for 2–4 years. Shell cordovan, due to the compact fibre structure, frequently exceeds 4 years. Vegetable-tanned calf leather develops a patina over time but is more susceptible to moisture. Rotating between multiple straps and protecting them from water significantly extends the life of the strap.