Rolex
Datejust 31 178344-0034— lug 16mm

The Rolex Datejust 31 ref. 178344-0034 has a lug width of 16mm. This measurement should be taken with a digital calliper inside the lug channel at its narrowest point. Respecting this dimension is essential when selecting an aftermarket strap to ensure proper fit and a refined appearance.

For the Datejust 31 178344-0034 in white Rolesor, a polished alligator strap is the most coherent choice given the case's elegant character. Alternatively, vegetable-tanned calfskin develops a natural patina over time, while shell cordovan offers exceptional durability and a compact grain texture. All straps must measure 16mm at the lug and ideally feature curved ends to match Rolex's lug geometry.

To replace the strap on the Datejust 31, use a spring bar tool to release the spring bars securing the strap to the lugs. Work on a soft surface to avoid scratching the case. If you are not experienced with this procedure, it is advisable to consult a watchmaker or a specialist atelier such as Casati Milano, which offers a strap fitting service.

Yes, there are many high-quality aftermarket straps compatible with the Datejust 31 ref. 178344-0034, provided they feature a 16mm lug width and curved ends to suit the Rolex lug profile. Milano Straps produces handcrafted straps in leather, rubber, and other materials specifically calibrated for this model, with bespoke customisation available through the Casati Milano atelier.

The lifespan of a leather strap depends on the material, frequency of use, and care. A high-quality alligator strap worn daily and properly maintained can last between 2 and 5 years. Vegetable-tanned calfskin develops character over time but is more sensitive to moisture. Shell cordovan is the most durable among classic leathers. Milano Straps provides an 18-month guarantee against manufacturing defects on all handcrafted straps.