Rolex
Datejust 31 178241-0015— lug 16mm

The Rolex Datejust 31 reference 178241-0015 has an official lug width of 16 mm. This measurement is taken as the internal distance between the two lugs using a calliper. It is the key parameter for selecting a compatible replacement strap.

For the Datejust 31 178241-0015 in steel and Everose gold, the most suitable straps are vegetable-tanned alligator in cognac, havana or bordeaux tones, or shell cordovan for everyday wear. A deployant clasp in steel or rose gold ensures both security and visual symmetry with the two-tone case.

To replace the strap on the Datejust 31, the springbars must be removed using a dedicated springbar tool. The lugs on this model are short and slightly downward-curved, so a fine-tipped tool is recommended to avoid scratching the case. The operation does not require specialist watchmaking tools.

Yes, many artisan manufacturers produce aftermarket straps with a 16 mm lug width compatible with the Datejust 31 178241-0015. Milano Straps offers a curated selection of leather, rubber and fabric straps, both made to order and available online, with curved or straight ends to suit individual aesthetic preferences.

The lifespan of a leather strap depends on the material, care and frequency of use. A high-quality vegetable-tanned alligator strap, properly maintained and stored, can last between 3 and 7 years while retaining its structural and aesthetic integrity. Shell cordovan tends to last longer due to its exceptionally dense fibre structure. Avoiding prolonged contact with water and perspiration significantly extends strap life.