Rolex
Datejust 31 278344rbr-0014— lug 16mm

The Rolex Datejust 31 ref. 278344RBR-0014 features lugs measuring exactly 16mm. This dimension is measured by inserting a calliper between the lug walls at the case back, in direct contact with the metal surfaces. A compatible strap must have a head width of 16mm to a tolerance of no more than ±0.3mm to ensure correct spring bar fitment.

Given the two-tone white gold and Oystersteel case of the Datejust 31 278344RBR-0014, the most suitable materials are alligator in cool tones (slate grey, navy blue) or vegetable-tanned calf leather for a natural patina effect over time. Shell cordovan in burgundy is a more distinctive choice. In all cases, a tapered tail of 14mm complements the geometry of the Oyster lugs.

To replace the strap on a Datejust 31, the spring bars connecting the bracelet or strap to the case lugs must be removed. Use a spring bar tool with a fine tip, inserting it into the lateral notch of the bar and compressing the spring-loaded ends to release one side at a time. It is advisable to work on a soft surface to avoid scratching the white gold case.

Yes. Any strap with a 16mm head and standard 1.5mm diameter spring bars is technically compatible with the Datejust 31. Milano Straps handcrafted straps are produced in the 16mm size with a tapered tail of 14mm, available in alligator, calf leather, shell cordovan or NATO nylon, with a standard buckle or deployant clasp upon request.

The longevity of a leather strap depends on the material, frequency of wear and care. A quality alligator strap, with regular alternating use, typically lasts 2 to 4 years before visible wear appears on the keeper and head. Vegetable-tanned calf develops a patina but is more susceptible to moisture. Rotating between two straps significantly extends the life of both. Milano Straps products carry an 18-month warranty against manufacturing defects.