Rolex
Datejust 31 178241-0005— lug 16mm

The Rolex Datejust 31 ref. 178241-0005 has a lug width of 16mm. This measurement is taken internally between the two lugs using a millimetre calliper, in direct contact with the case. Respecting this dimension is essential to ensure a correct fit and a clean aesthetic result with any aftermarket strap.

For the 178241-0005 in Everose gold and steel, a vegetable-tanned alligator strap is the most fitting choice for the watch's formal register. Shades of burgundy, tobacco or champagne complement the case's two-tone finish. For intensive daily wear, box-calf leather or fluoroelastomer rubber offer superior durability without compromising aesthetics.

The strap on the Rolex Datejust 31 is secured to the case via 16mm spring bars inserted into the lugs. To replace it, you will need a thin-blade spring bar tool or a dedicated lever tool to compress and release the spring bars without scratching the case. It is advisable to work on a soft surface and, if in doubt, to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. Several artisan manufacturers, including Casati Milano via milanostraps.it, produce aftermarket straps with a 16mm attachment compatible with the Datejust 31. It is important to verify that the strap's tail width matches or is slightly under 16mm and that the lug length suits the geometry of Rolex lugs. Available materials include alligator, calf leather, NATO and rubber.

Longevity depends on the material, frequency of use and level of care. A quality alligator strap, properly conditioned and kept away from excessive moisture and perspiration, can maintain its structural and aesthetic integrity for 3 to 5 years with regular wear. Calf leather typically lasts 2 to 3 years. Using a leather conditioner and rotating between straps significantly extends the lifespan. Casati Milano provides an 18-month guarantee against manufacturing defects.