Strap for Datejust 31 Yellow Gold / Domed / Black MOP / Oyster

The Rolex Datejust 31 278248-0037 has a lug width of 16mm. This measurement is specific to the 31mm case size and differs from the 20mm found on Datejust 36 or 41 models. To verify it independently, measure the internal distance between the two parallel lugs at the point where the strap is attached using a digital calliper.

For the yellow gold Datejust 31 278248-0037, the most suitable materials are lacquered alligator — which echoes the lustre of the precious metal case — and shell cordovan, which develops a distinctive patina over time. Vegetable-tanned leather is preferable to chrome-tanned for longevity and chromatic depth. A gold-tone deployant clasp completes the pairing cohesively.

To replace the strap on the Datejust 31 278248-0037, use a dedicated springbar tool or a 1.2mm diameter springbar remover. Insert the tip into the small hole on the side of the lug, compress the springbar and slide the strap free. The process is reversible and does not require professional tools, though care must be taken to avoid scratching the yellow gold lugs.

Yes. Any aftermarket strap with a 16mm lug width is compatible with the Datejust 31 278248-0037, provided the tail thickness is proportionate to the profile of the yellow gold case. Milano Straps offers a curated selection of handcrafted 16mm straps in premium leathers, with gold-tone buckles or deployant clasps available for visual consistency.

The lifespan of a leather strap depends on the material, maintenance and frequency of use. A quality alligator strap, kept away from water and excessive perspiration, typically lasts 3 to 5 years. Shell cordovan, owing to its dense fibrous structure, can last well beyond 5 years, developing a distinctive patina over time. Casati Milano straps come with an 18-month warranty covering manufacturing defects.