Strap for Datejust 31 Stainless Steel Fluted / Oyster / Grey - Roman

The lug width (also called ansa width) of the Rolex Datejust 31 278274-0027 is precisely 16mm. This measurement represents the distance between the two lugs—the curved shoulders of the case—measured from the inner edge of one lug to the inner edge of the other. This is a rare specification, specific to certain Datejust 31 models, making verification essential before purchasing an aftermarket strap. We recommend measuring with a digital calliper or flexible ruler for absolute accuracy.

For the Datejust 31 in stainless steel and white gold, we recommend crocodile leather of superior quality, with fine grain and natural shades (brown, black, cognac). Crocodile develops a noble patina over time that dialogues beautifully with the two-tone case. Alternatively, vegetable-tanned calfskin offers soft texture and elegant striations. For more practical options, a cotton or silk NATO strap ensures versatility and easy changing. All our 16mm straps are available in the dedicated online collection.

Changing the strap requires simple tools: a fine-tipped screwdriver or a dedicated spring bar removal tool. Locate the two horizontal holes at each lug where the spring bar sits. Gently push the spring bar inward with your tool—it will retract slightly. Extract the current strap with slow, careful movements. Repeat for the other lug. Reverse the process with your new strap, ensuring the spring bars seat completely and the strap sits symmetrically between the lugs.

Yes, absolutely. Milano Straps offers a complete collection of artisanal leather and synthetic material straps compatible with the 16mm lug width. Every strap is verified for compatibility and crafted to premium standards. We also offer the Casati Milano service—a bespoke sartorial atelier where you can personally select leather, follow the crafting process, and receive a custom strap with an 18-month manufacturer guarantee.

Longevity depends on leather quality and usage frequency. A superior-grade crocodile strap, like those offered by Milano Straps, typically lasts 4–6 years with daily wear, developing an enchanting patina. Vegetable-tanned calfskin has similar longevity, 4–5 years, with more visible ageing. Proper storage is crucial: avoid excessive humidity, prolonged direct sunlight, and repeated contact with water. A well-maintained strap can last beyond these estimates, acquiring noble signs of ageing. We recommend alternating between at least two straps to extend overall lifespan.