Strap for Datejust 31 Stainless Steel Fluted / Jubilee / Bronze Roman

The lug width of the Rolex Datejust 31 178274-0090 is 16 mm. This is a specific dimension that requires straps made for this format. Before purchasing an aftermarket strap, it is advisable to measure the internal distance between the lugs with a calliper to confirm exact compatibility.

For the Datejust 31 in steel and white gold, an alligator strap — lacquered or satin-finished — is the most coherent choice given the watch's formal register. Alternatively, vegetable-tanned calf leather develops a patina that improves with daily wear, while shell cordovan offers durability and a tight grain. The 16 mm lug width requires craftsmen specialised in smaller formats.

To replace the strap on the Datejust 31, a 1.8 mm spring bar tool is required to remove the spring bars securing the bracelet or strap to the lugs. Care must be taken to avoid scratching the steel case or the white gold lug surfaces. If in doubt, it is preferable to consult a watchmaker or visit the Casati Milano atelier.

Yes, high-quality aftermarket straps compatible with the Datejust 31's 16 mm lug width do exist. It is essential to ensure the strap is pre-curved or made from supple enough material to follow the curved lug geometry of this model. Milano Straps offers a curated selection of handcrafted 16 mm compatible straps made from premium selected leathers.

The lifespan of a leather strap depends on material and usage: a quality alligator strap used daily under moderate conditions typically lasts 2 to 4 years. Shell cordovan and vegetable-tanned calf leather tend to last longer due to their dense fibre structure. Frequent exposure to water, perspiration and perfume accelerates deterioration. Casati Milano offers an 18-month warranty against manufacturing defects.