Rolex
Datejust 31 178344-0020— lug 16mm

The lug width of the Rolex Datejust 31 ref. 178344-0020 is 16mm. This measurement should be taken internally between the two lugs using a digital calliper. Respecting this dimension is essential to ensure a perfect fit of the strap to the Rolesor case in steel and white gold.

For the Datejust 31 178344-0020 with meteorite dial and Rolesor case, the most suitable straps are in glossy alligator in grey or black tones, or in shell cordovan in navy blue or burgundy. These materials complement the Widmanstätten texture of the dial and enhance the fluted white gold bezel. A fine-grained vegetable-tanned calf leather strap is a refined and understated alternative.

Replacing the strap on a Rolex Datejust 31 requires a dedicated springbar tool or a thin flat-head instrument to release the spring bars from the lugs. It is recommended to work on a soft surface to avoid scratching the case. For a high-value watch such as this reference, it is advisable to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes, many artisan manufacturers produce aftermarket straps with a 16mm lug width and curved ends compatible with the Datejust 31 case. Milano Straps offers a selection of 16mm straps in various materials — leather, alligator, shell cordovan, rubber — with a buckle or deployant clasp. It is essential to verify that the strap features curved ends to ensure correct fitment against the case.

The lifespan of a leather strap depends on the quality of the material and daily care. A high-quality alligator or shell cordovan strap, worn in rotation with other straps and stored away from moisture and heat, can last between 3 and 7 years whilst retaining its structural and aesthetic integrity. Milano Straps straps are covered by an 18-month warranty against manufacturing defects.