Strap for Datejust 31 Yellow Gold Fluted / President / Black MOP

The Rolex Datejust 31 reference 178278-0111 has a lug width of 16mm. This measurement is specific to the 31mm case diameter and is not shared with other Datejust variants such as the 36mm (20mm) or the Lady-Datejust 28mm (13mm). To verify it accurately, use a digital calliper positioned between the lugs flush against the case.

For the yellow gold Datejust 31, alligator straps with hornback or mississippiensis grain and vegetable-tanned calf leather are the most coherent choices with the case aesthetics. Alligator provides a three-dimensional texture that complements the gold's reflections; calf leather develops a natural patina over time. For sports use, vulcanised rubber is the most suitable technical alternative. All straps must feature a 16mm attachment.

To replace the strap on a Datejust 31, you will need a fine-tipped spring bar tool with a 0.8mm point compatible with Rolex spring bars. Insert the tip into the hole on the lug, compress the spring bar and slide the strap out laterally. Extra care is required to avoid scratching the yellow gold lugs: it is advisable to protect the case with low-adhesion tape before proceeding.

Yes. Aftermarket straps with a 16mm attachment are fully compatible with the Datejust 31 178278-0111, provided the spring bars have the correct diameter (1.5mm Rolex standard) and the attachment width is precisely 16mm with no tolerance. Milanostraps.it offers a curated selection of handcrafted 16mm straps made from premium materials with fittings verified for this specific reference.

The lifespan of a leather strap depends on the material, care routine and frequency of wear. A quality alligator strap, worn daily and maintained correctly (kept away from water, perspiration and perfumes), retains its structural and aesthetic integrity for 3 to 5 years. Vegetable-tanned calf leather, being more porous, tends to deteriorate sooner under conditions of prolonged moisture. Casati Milano provides an 18-month warranty against manufacturing defects on all its straps.