Rolex
Datejust 31 278241-0028— lug 16mm

The Rolex Datejust 31 ref. 278241-0028 has a lug width of 16mm. This measurement is taken at the narrowest point between the two lugs using a digital calliper, where the strap spring bar sits. This is specific to the 31mm case family and is not interchangeable with the 20mm straps used on the Datejust 36.

For the two-tone Rolesor version in Oystersteel and Everose gold, alligator leather straps in polished bordeaux, plum or anthracite accentuate the bimetallic contrast of the case. Vegetable-tanned leather develops an authentic patina over time. For daily wear or aquatic use, a vulcanised rubber strap at 16mm is the most technically appropriate choice given the 100-metre Oyster water resistance.

The strap on the Datejust 31 is secured by 16mm spring bars inserted into the case lugs. A fine-tipped spring bar tool is required to compress the bars without scratching the steel or gold surfaces. Extra care is needed on Rolesor models due to the risk of marking the two-tone metal. If in doubt, consult a watchmaker or the Casati Milano atelier.

Yes. The Datejust 31 278241-0028 uses standard 16mm spring bars, compatible with a wide range of artisan aftermarket straps. milanostraps.it offers a dedicated 16mm selection in leather, NATO and rubber, designed to fit the short lug profile of the Datejust 31 without modification. It is important to confirm that the strap end attachments are flat, as the Datejust 31 lugs do not require curved ends as found on some Rolex sport models.

Longevity depends on material and usage. A quality vegetable-tanned alligator strap, kept away from excessive perspiration and water, will typically last 2–4 years with daily wear. Shell cordovan, owing to the density of the horse muscle fibres, tends to last longer and develops a compact patina. The Casati Milano guarantee covers 18 months against manufacturing defects. Rotating between two straps significantly extends the life of both.