Strap for Datejust 31 Stainless Steel Domed Diamond / Jubilee / MOP - Roman

The Rolex Datejust 31 reference 178344-0004 features a lug width of 16mm, measured internally between the two lugs at the point of contact with the case. This is a non-standard size that requires straps with ends shaped to match the tapered geometry of this model's lugs.

For a Datejust 31 with a mother-of-pearl dial and white gold components, vegetable-tanned alligator leather is the most coherent choice both aesthetically and in terms of longevity. Alternatively, shell cordovan offers a dense, lustrous surface that complements the metallic case components. For everyday wear, box-calf leather provides formal neatness with less visual weight.

Replacing the strap on the Datejust 31 requires a double-pronged springbar tool to remove the springbars from the lugs. It is advisable to work on a soft surface to avoid scratching the case. The Datejust 31 lugs are tapered, so always ensure the new strap features shaped ends compatible with the lug geometry of the 178344-0004.

Yes, high-quality aftermarket straps compatible with the Datejust 31 16mm lug width are available. Milano Straps produces handcrafted straps in 16mm with shaped ends designed to fit the curvature of Rolex lugs, available in alligator, calf leather, shell cordovan and rubber. Each strap comes with an 18-month warranty against manufacturing defects.

The lifespan of a leather strap on a Datejust 31 depends on the material and care taken. A quality alligator strap, treated with natural waxes and kept away from prolonged exposure to water and perspiration, can last between 3 and 5 years while retaining its structural integrity and appearance. Shell cordovan, due to the density of its fibres, tends to last longer and develops a desirable patina over time. Using a deployant clasp significantly reduces stress on the stitching, extending the strap's useful life.