Strap for Datejust 31 Stainless Steel Diamond / Oyster / Silver Computer

The Rolex Datejust 31 reference 178384-0015 has a lug width of 16mm. This measurement is taken internally between the two lugs at the point where the strap is inserted, using a digital calliper. Respecting this dimension precisely is essential to ensure correct fitment between strap and case.

For the Datejust 31 178384-0015 in white Rolesor configuration, an alligator Mississippi strap with a polished finish offers the highest aesthetic coherence with the white gold bezel. Alternatively, vegetable-tanned calfskin develops a distinctive patina over time and suits refined daily wear. Both options must feature a 16mm lug width.

The strap on the Datejust 31 is secured via removable spring bars. Using a springbar tool, compress the spring bar laterally to release it from the lug hole, remove the old strap, then insert the new one by engaging one side first before pressing the other into place. Always work on a soft surface to avoid scratching the case, and verify both spring bars are fully seated before wearing the watch.

Yes. Aftermarket straps with a 16mm lug width and standard 1.8mm spring bar diameter are compatible with the Datejust 31 178384-0015. Milano Straps produces handcrafted straps in alligator, calfskin and rubber specifically calibrated for this size, with buckle options in steel or gold, without affecting the watch's warranty.

The lifespan of a leather strap depends on the quality of the tanning process, frequency of wear, and exposure to perspiration and moisture. A high-quality alligator strap, worn regularly but not exclusively, retains its structural and aesthetic integrity for 3 to 5 years. Vegetable-tanned calfskin offers a similar lifespan whilst developing a characteristic patina. Rotating between multiple straps significantly extends the life of each one.