Rolex
Datejust 31 278271-0004— lug 16mm

The Rolex Datejust 31 reference 278271-0004 has a lug width of 16mm. This is a non-standard size in the aftermarket strap segment. Before purchasing a replacement strap, it is essential to confirm the measurement using digital callipers positioned between the lugs at the point of strap attachment.

For the Datejust 31 in Everose Rolesor, a vegetable-tanned alligator strap in burgundy or cognac tones is the most harmonious choice, reflecting the warm hues of the rose gold case. Alternatively, navy blue or forest green calf leather creates an elegant contrast against the typically white mother-of-pearl dial. Vulcanised rubber is recommended for frequent use in conditions where the case's water resistance becomes relevant.

The strap on the Datejust 31 is secured via spring bars fitted into the case lugs. To remove it, insert a suitable spring bar tool into the notch on the 16mm spring bar, compress it and slide the strap free. No specialist watchmaking tools are required, though it is advisable to work on a soft surface to protect the case from scratches.

Yes. Aftermarket straps with a 16mm attachment are compatible with the Datejust 31, provided they feature pre-curved ends designed to follow the profile of the Oyster case's horn lugs. Milanostraps.it offers a curated selection of handcrafted 16mm straps in various materials, specifically made to sit correctly against the Rolex case.

Longevity depends on material and usage. A quality vegetable-tanned alligator strap, properly maintained — rotated with other straps, kept away from prolonged moisture, occasionally treated with leather conditioner — can retain its structural and aesthetic integrity for three to five years. Shell cordovan, owing to its dense fibre structure, typically lasts longer and develops a distinctive patina over time. Calf leather straps have shorter lifespans but are more economical to replace.