Rolex
Datejust 31 278271-0005— lug 16mm

The lug width is 16 millimetres. This is the exact diameter between the case lugs, determined by the geometry of the barrel arbor. Verify this measurement with a digital calliper before ordering a strap, as even 0.1mm deviation compromises fit and security.

Alligator is the classical choice for this rose gold and steel bicolour: the geometric grain texture amplifies the formality of the case. Vegetable-tanned calf offers a patina that develops over time. Shell cordovan is ideal for those desiring extraordinary aesthetic ageing. A rubber or NATO strap transforms the Datejust 31 into a practical travel or yacht club watch.

It requires specific tools: a spring bar tool and hands experienced in case handling. The procedure involves removing the case back, positioning the helical spring into its housing, ensuring the lug enters parallel to the case lugs, and verifying secure locking. Consult an expert if you lack experience: improper technique risks case damage and safety compromise.

Yes, if constructed to Rolex precision standards. The lug must measure exactly 16mm, with lateral shoulders shaped to the case geometry, and an interior finish that reduces friction. A quality artisanal strap, crafted from noble leather with meticulous construction, guarantees superior fit, security, and longevity compared to generic aftermarket alternatives.

Durability depends on material and wear patterns. Professional-grade alligator lasts 4–8 years with daily wear and routine maintenance. Vegetable-tanned calf ranges from 3–6 years. Shell cordovan, with minimal care, can endure 10+ years thanks to its density and resilience. Daily use frequency, climate, sun exposure, and perspiration accelerate deterioration.