Rolex
Datejust 31 278341rbr-0004— lug 16mm

The lug width of the Datejust 31 reference 278341rbr-0004 is 16 millimetres. This specification indicates the distance between the lugs of the case where the strap is attached. It is essential to choose a strap specifically designed for 16mm lug width to ensure a precise fit and harmonious aesthetic transition.

Alligator remains the classic choice to enhance the formal character of the two-tone Everose and steel case. For daily wear, vegetable-tanned calf leather offers softness and develops a noble patina over time. If you prefer practicality without aesthetic compromise, an FKM rubber strap maintains the case's elegance whilst preserving resistance to environmental exposure. Shell cordovan represents the pinnacle of tactile quality for those willing to invest in maintenance.

The strap is replaced by extracting the spring bars from the case lugs. Use a dedicated tool to press the small internal hook of the bar, freeing the worn strap. Align the new bars with the housing and snap the hooks until locked: it must be stable with no play. If inexperienced, consult a certified watchmaker to avoid scratching the case.

Yes, provided the lug width is exactly 16mm and the craftsmanship is of high quality. Artisanal premium leather straps, such as those offered by Milano Straps, guarantee superior aesthetic cohesion and durability compared to generic products. Ensure the buckle or deployant clasp is proportioned to the case diameter (31mm) to maintain visual harmony.

Durability depends on material and usage. An alligator strap with vegetable tanning, with proper maintenance (regular cleaning, drying after humidity exposure), can last 3–5 years under moderate daily use, developing a noble patina. Shell cordovan, more robust, extends this lifespan to 6–7 years. An FKM rubber strap resists 5–8 years without visible degradation. Breakdown depends on prolonged direct sunlight exposure and stagnant humidity.