Rolex
Datejust 31 278278-0030— lug 16mm

The Rolex Datejust 31 278278-0030 features a lug width of 16 millimetres. This measurement corresponds to the distance between the two spring bar pins that protrude from the case when the bracelet is removed. A compatible strap must measure precisely 16 millimetres in width to attach symmetrically to the case without play or binding.

For the yellow gold Datejust 31, an alligator strap in shades of brown, burgundy, or cognac is recommended, as it enhances the warmth of the metal. Alternatively, vegetable-tanned calf leather offers elegant softness, whilst shell cordovan guarantees longevity and develops a remarkable cognac patina over time. In summer, a cotton supima NATO strap provides practicality without aesthetic compromise.

The strap is secured to the case by two spring bars positioned laterally. Using a dedicated spring bar removal tool, gently push one pin inward to release the strap from the lower case lug. Repeat on the other side. Insert the new strap by aligning the bars to the holes, then re-engage the pins with the same tool until they click into position.

Yes, any strap with a 16 millimetre lug width is compatible. Premium aftermarket straps crafted from alligator, calf, or shell cordovan are an excellent choice for personalising your watch. It is essential to verify lug width compatibility before purchase and select brands that guarantee construction quality and premium materials.

A premium leather strap—crafted in alligator or calf—typically lasts 3 to 5 years of daily wear, depending on the tanning method, frequency of use, and maintenance. Alligator tends to last longer owing to the inherent robustness of the leather. Regular maintenance (gentle cleaning and seasonal conditioning) significantly extends the strap's lifespan.