Rolex
Datejust 31 278381rbr-0010— lug 16mm

The Rolex Datejust 31 ref. 278381rbr-0010 has a lug width of 16mm. This measurement should be taken with a digital calliper between the two lugs at the narrowest point, closest to the case. It is important not to confuse this with the lug widths of larger Datejust references, which run at 18mm or 20mm.

For the Datejust 31 in Rolesor Everose, the most suitable materials are vegetable-tanned alligator — ideal for formal wear, as the natural grain complements the diamond-set bezel — and box-calf leather for a sleek dress aesthetic. Shell cordovan offers superior durability with a compact profile. In all cases, the attachment width must be precisely 16mm.

Replacing the strap on the Datejust 31 requires a fine-tipped spring bar tool. Insert the tip into the slot between the lug and the spring bar, compress the spring and release the strap. The process is fully reversible and does not require a watchmaker, but care must be taken to avoid scratching the Rolesor Everose lugs. Place the watch on a soft cloth throughout the procedure.

Yes. The Datejust 31 uses standard 16mm spring bars, compatible with any quality aftermarket strap made to that width. Milano Straps offers a curated selection of 16mm straps in artisan leather, rubber and fabric, produced to dimensional specifications calibrated for Rolex lugs. The underside curvature of each strap is optimised to follow the case profile without gaps.

Longevity depends on the material and usage. A quality alligator strap with vegetable tanning and reinforced stitching can last between three and five years with standard care — avoid prolonged contact with water and perspiration, and condition the leather periodically with a colourless cream. Box-calf has a similar lifespan. Shell cordovan, owing to the density of its fibres, frequently exceeds five years. Milano Straps provides an 18-month warranty against manufacturing defects on all artisan straps.