Rolex
Datejust 31 178279-0015— lug 16mm

The lug width of the Rolex Datejust 31 ref. 178279-0015 is 16mm. This measurement should be taken with a digital calliper inside the case lugs, parallel to the caseback. Respecting this dimension is essential to ensure correct fitment and a visually proportionate relationship between the case and the strap.

For a white gold 18-carat case such as that of ref. 178279-0015, an alligator strap with vegetable tanning is the most aesthetically and qualitatively coherent choice: the regular scale grain complements the polished finish of the precious metal. Shell cordovan is an alternative offering a compact, naturally lustrous surface. A deployant clasp in steel or white gold is recommended to preserve the strap and ensure consistent fit.

To replace the strap on the Datejust 31, a flat or forked spring bar tool with a blade width of 0.8–1.0mm suitable for 16mm lugs is required. Compress the spring bar between the lug and the strap, remove the bracelet, then insert the new strap by aligning the spring bar with the lug holes. It is advisable to work on a soft pad to avoid scratching the white gold case.

Yes. Any strap produced with a 16mm lug width and standard spring bar is compatible with the Datejust 31 ref. 178279-0015. Milano Straps offers a selection of handcrafted straps in 16mm — in alligator, calfskin, shell cordovan and rubber — made to precise dimensional tolerances to guarantee both mechanical and visual compatibility with the white gold case.

The longevity of a leather strap depends on the material and care. A quality vegetable-tanned alligator strap, used carefully (avoiding prolonged exposure to water and perspiration), typically lasts 2–4 years with daily wear. Shell cordovan, owing to its dense fibre structure, tends to last longer and develops a distinctive patina. Casati Milano straps carry an 18-month warranty against manufacturing defects.