Rolex
Datejust 31 178343-0039— lug 16mm

The lug width of the Rolex Datejust 31 178343-0039 is 16mm. This measurement should be taken with a digital calliper, measuring the internal distance between the two lugs at the point where they meet the case. It is a size specific to the 31mm Datejust format and requires dedicated straps to ensure correct mechanical and aesthetic fitment.

For the Datejust 31 178343-0039 in Yellow Rolesor, the most suitable straps are alligator with hornback grain in cognac or dark chocolate tones, which complement the gold elements of the case. Alternatively, vegetable-tanned box-calf leather develops a distinctive patina over time, whilst shell cordovan offers formal rigour and superior longevity. The correct lug width is 16mm.

To replace the strap on a Rolex Datejust 31, a spring bar tool is required to remove the 1.8mm spring bars housed in the 16mm lugs. It is advisable to work on a soft surface to protect the polished case surfaces. If in doubt, it is recommended to consult a watchmaker or a specialist atelier such as Casati Milano.

Yes, high-quality aftermarket straps are available for the Rolex Datejust 31 178343-0039, provided they have a lug width of 16mm and standard 1.8mm spring bars. Milano Straps offers a selection of handcrafted straps in 16mm, available bespoke or ready to purchase online, in various materials and finishes suited to the Yellow Rolesor case.

The lifespan of a leather strap on a Rolex Datejust 31 depends on the material and frequency of use. A quality alligator or shell cordovan strap, properly maintained (avoiding prolonged moisture and applying leather conditioner periodically), can last between 3 and 7 years. Vegetable-tanned calf leather typically lasts 2 to 4 years with regular wear. Milano Straps provides an 18-month guarantee against manufacturing defects.