Rolex
Datejust 31 178341-0032— lug 16mm

The Rolex Datejust 31 reference 178341-0032 has a lug width of 16mm. To measure accurately, use a digital calliper placed inside the lugs at the point of strap attachment, excluding any protruding spring bar ends.

For this Everose Gold and steel reference, a vegetable-tanned alligator strap in cognac or dark brown is the most coherent choice given the watch's formal register. For everyday wear, smooth calfskin in burgundy or midnight blue offers comfort and versatility. A folding deployant clasp is recommended for higher-grade leather straps to protect stitching from daily wear.

You will need a double-pronged spring bar tool with a 0.8mm tip to remove the spring bars from the lugs. The Datejust 31 features closed, straight lugs: care must be taken not to scratch the case. Place the watch on a cushion or dedicated holder and work in good light. Alternatively, any qualified watchmaker or specialist atelier can perform the swap in minutes.

Yes. Several artisan manufacturers produce aftermarket straps with a 16mm lug width compatible with the Datejust 31. Milano Straps offers a curated selection of 16mm straps in various materials and finishes, available online with fast shipping. For a bespoke leather strap with in-atelier selection, the Casati Milano service is available by appointment.

Lifespan depends on material and conditions of use. A standard calfskin strap worn daily typically lasts 12 to 24 months. Shell cordovan and vegetable-tanned alligator, owing to their denser fibre structure, can last 3 to 5 years with normal care. Avoiding prolonged exposure to water, perspiration, and UV radiation significantly extends strap life.