Rolex
Datejust 31 278278-0049— lug 16mm

The Rolex Datejust 31 278278-0049 has a lug width of 16mm. This measurement is standard across the entire Datejust 31 family and must be matched precisely to ensure compatibility with any aftermarket or replacement strap.

For the Datejust 31 in yellow gold, smooth alligator with a symmetrical belly grain in tabac, cognac or british green tones offers the most coherent pairing with the watch's identity. Vegetable-tanned calf leather and shell cordovan are excellent alternatives with a strong artisanal character. A deployant clasp in yellow gold or brushed steel is recommended to protect the lugs.

To replace the strap on a Datejust 31, the spring bars connecting the strap or bracelet to the case lugs must be removed using a spring bar tool. It is strongly advisable to entrust this operation to a qualified watchmaker or the Casati Milano atelier to avoid scratching the yellow gold lugs.

Yes. Any strap with a 16mm lug width and straight end is technically compatible with the Rolex Datejust 31 278278-0049. Milano Straps offers handcrafted straps in alligator, calf leather, shell cordovan and rubber, made specifically for this lug size, with finishes and clasps suited to yellow gold cases.

The lifespan of a leather strap depends on the quality of the tanning, daily care and exposure to moisture. A high-quality alligator or vegetable-tanned calf strap, properly maintained and rotated with other straps, can last between 3 and 7 years while retaining its structural and aesthetic integrity. Casati Milano straps carry an 18-month warranty against manufacturing defects.