Rolex
Datejust 31 278243-0031— lug 16mm

The Rolex Datejust 31 reference 278243-0031 has a lug width of 16mm. This measurement is taken internally between the two lugs using a digital calliper and must be respected precisely when selecting any aftermarket strap, as even a one-millimetre discrepancy will prevent the spring bar from fitting correctly.

For the Datejust 31 in Oystersteel and yellow gold, an alligator belly or hornback strap in cognac, honey or burgundy tones offers the highest aesthetic coherence with the warmth of the gold components. Vegetable-tanned calf leather or shell cordovan are excellent alternatives for longevity and a distinctive patina. All straps must feature a 16mm attachment width.

To replace the bracelet or strap on the Datejust 31, the spring bars must be removed from the lugs using a dedicated springbar tool. Work on a soft surface to protect the case and ensure that the replacement spring bars are the correct diameter for Rolex's 16mm lugs. The procedure, while straightforward, requires care to avoid scratching the yellow gold case components.

Yes, there is a wide range of aftermarket straps with a 16mm attachment compatible with the Datejust 31 278243-0031. Milanostraps.it offers a curated selection of handcrafted straps in alligator, calf leather, shell cordovan and NATO nylon, available bespoke or ready to ship, with steel or gold-tone buckles and deployant clasps. Dimensional compatibility is ensured by the standard 16mm lug width.

The lifespan of a leather strap depends on the quality of the tanning process, the thickness of the leather and daily usage. A high-grade alligator or shell cordovan strap, properly maintained and rotated with other straps, can last between three and six years while retaining its shape and appearance. Vegetable-tanned calf develops a characteristic patina over time but is more susceptible to moisture. Avoiding prolonged contact with water and perspiration significantly extends its service life.