Strap for Datejust 31 Yellow Gold Diamond / Oyster / Black MOP Computer

The Rolex Datejust 31 reference 178288-0066 has a lug width of 16 mm. This specification is particular to Datejust models with a 31 mm case and must not be confused with the 28 mm variant (13 mm lugs) or the 36 mm version (20 mm lugs). When selecting an aftermarket strap, ensure the spring bars are machined in AISI 316L stainless steel at the correct 16 mm length for a precise fit within the gold case horns.

For an 18-carat yellow gold case, glazed alligator leather in bordeaux, midnight blue or cognac tones is the most harmonious choice, as it complements the warmth of the gold without competing with it. Shell cordovan in burgundy or natural finish provides a compact, silky grain that develops a rich patina over time. Vegetable-tanned calf leather is the most practical option for daily wear. A deployant clasp in gold or PVD steel completes any leather pairing and ensures even pressure distribution on the wrist.

Replacing the strap on a Datejust 31 requires a flat-blade watchmaker's screwdriver (0.8–1.0 mm tip) or a spring bar tool to release the spring bars from the case lugs. The original Rolex spring bars measure approximately 1.8 mm in diameter and 16 mm in length; aftermarket spring bars in AISI 316L stainless steel of the same dimensions are recommended as replacements. The procedure takes approximately five minutes and does not require professional equipment, though care must be taken to avoid scratching the yellow gold surfaces.

Yes. Any aftermarket strap with a 16 mm lug width is fully compatible with the Datejust 31 178288-0066, provided the spring bars have the correct diameter (1.8 mm) and length (16 mm). Casati Milano crafts bespoke straps in alligator, shell cordovan and vegetable-tanned calf leather, supplied with spring bars and a choice of buckle or deployant clasp. Each strap is handmade to fit the yellow gold case horns with precision.

The lifespan of a leather strap depends on the material, frequency of use and exposure to perspiration and moisture. A quality vegetable-tanned calf strap worn daily typically lasts 18 to 24 months. Shell cordovan, owing to its dense fibre structure, can exceed three years with minimal maintenance. Alligator leather, when conditioned with a leather cream every three to four months and kept away from water, retains its structural integrity and gloss for two to four years. Casati Milano straps carry an 18-month production defect warranty.