Rolex
Datejust 31 178343-0013— lug 16mm

The Rolex Datejust 31 reference 178343-0013 features a lug width of 16mm. This measurement is taken with a digital calliper placed between the two lugs at the point where the strap meets the case. Respecting this precise dimension is essential to ensure a clean fit and accurate strap alignment on the wrist.

Given the two-tone Rolesor construction of the 178343-0013 — stainless steel and 18ct yellow gold — a polished alligator strap is the most coherent choice: its specular grain echoes the fluted bezel in gold. Alternatively, a vegetable-tanned calf strap develops a warm cognac patina that complements the yellow gold tone. For sporting or casual use, a vulcanised rubber strap offers durability without compromising the Oyster's formal aesthetic.

Replacing the strap on a Datejust 31 requires a fine-tipped springbar tool with a 1.5mm point, compatible with Rolex lug geometry. Insert the tip into the lateral lug hole, compress the spring bar and slide the strap free. Exercise care to avoid scratching the case: applying surgical tape over the lugs during the operation is strongly recommended.

Yes. The aftermarket offers a wide selection of 16mm straps fully compatible with the Datejust 31 178343-0013. Milano Straps provides handcrafted options in alligator, calf leather and shell cordovan, as well as rubber straps, all fitted with standard 1.5mm spring bars compatible with Rolex lugs. Material quality and finishing are on a par with — or superior to — original Rolex straps.

The lifespan of a leather strap on a Datejust 31 depends on the material and frequency of wear. A quality alligator strap, properly maintained with specific leather conditioners and kept away from water and excessive perspiration, typically lasts between three and five years with daily wear. Vegetable-tanned calf develops a distinctive patina over time. Casati Milano offers an 18-month guarantee against manufacturing defects on all handcrafted straps.