Rolex
Datejust 31 278381rbr-0005— lug 16mm

The Rolex Datejust 31 278381rbr-0005 has a lug width of 16mm. This measurement is specific to the 31mm Oyster case and is not shared with the 28mm variant (13mm) or the 36mm variant (19-20mm). Any aftermarket strap must feature a precise 16mm attachment width.

For the Datejust 31 in Rolesor Everose, alligator leather in burgundy or cognac tones is the most coherent choice for the elegant bi-colour case. Vegetable-tanned calfskin suits those who appreciate a developing patina over time, while shell cordovan offers natural resistance and lustre. All straps must feature a precisely cut 16mm attachment.

Replacing the strap on a Datejust 31 requires a fine-tipped spring bar tool (1mm) to release the spring bars from the lugs. Work on a soft surface to protect the case from scratches. If in doubt, it is advisable to consult a professional watchmaker or Casati Milano atelier for a safe and damage-free installation.

Yes. The Datejust 31 with 16mm lugs is fully compatible with bespoke aftermarket straps. Milano Straps offers a curated selection of 16mm straps in alligator, calfskin, shell cordovan and rubber, crafted to the same dimensional tolerances as original Rolex straps. Compatibility refers to the attachment width; length can be customised at the time of order.

Longevity depends on the material and daily wear conditions. A quality alligator strap, with proper care, typically lasts 2 to 4 years. Vegetable-tanned calfskin has a similar lifespan but develops a distinctive patina over time. Shell cordovan is the most durable of the premium leathers and can exceed 4 years of use. Milano Straps provides an 18-month warranty against manufacturing defects on all handcrafted straps.