Rolex
Datejust 31 278278-0022— lug 16mm

The lug width of the Rolex Datejust 31 ref. 278278-0022 is 16mm. This measurement is taken with a digital calliper positioned between the two spring bar holes on the underside of the case. It is essential to select straps with curved ends to match the integrated lug profile characteristic of the Datejust 31.

For the yellow gold Datejust 31, a vegetable-tanned alligator strap fitted with a deployant clasp is the most coherent choice both aesthetically and in terms of quality. The bombé belly grain complements the fluted bezel. Alternatively, smooth box calf leather offers a thinner profile suited to daily wear under a shirt cuff.

To replace the strap on the Datejust 31, use a fine-tipped spring bar tool or a dedicated 16mm spring bar remover. Insert the tool into the lateral notch of the lug, compress the spring bar, and slide the strap free. The operation is fully reversible in a matter of minutes and does not require a watchmaker, provided care is taken not to scratch the yellow gold case.

Yes. Aftermarket straps with a 16mm lug width and curved ends are compatible with the Datejust 31 ref. 278278-0022. Milano Straps offers a curated selection of handcrafted straps in this size, available in alligator, calf leather, shell cordovan and NATO, with interchangeable buckles and deployant clasps suited to the case material and dimensions.

The lifespan of a leather strap depends on the quality of the hide, frequency of wear, and exposure to moisture and perspiration. A high-grade vegetable-tanned alligator strap, worn in rotation and properly maintained, can last between three and five years while retaining its patina and structure. Calf leather typically lasts between one and three years. Prolonged contact with water and cosmetic products should be avoided.