Rolex
Datejust 31 178248-0031— lug 16mm

The Rolex Datejust 31 178248-0031 features a lug width of 16 millimetres. This measurement represents the distance between the two lugs on the case where the strap attaches. It is essential to measure accurately with a digital caliper between the internal holes of the lugs to ensure perfect compatibility with any aftermarket strap.

For the 178248-0031 in yellow gold, authentic alligator leather in a medium brown shade (cognac) represents the classical and most harmonious choice. Alligator enhances the warmth of yellow gold through the contrast of natural textures. For formal occasions, black alligator with satin finish conveys gravitas without compromise. Alternatively, vegetable-tanned calf leather offers artisanal authenticity and develops a noble patina over time.

Strap replacement requires two specific tools: a spring bar tool (lever for removing the elastic rings) and a stable surface to position the watch. Carefully insert the lever into the small hole beside one lug to compress the internal elastic ring, then lift the metal pin. Repeat from the other side. To install the new strap, align the holes with the lugs and push the pin until you hear an audible click. We recommend this operation be performed by a qualified atelier to avoid scratching the case.

Yes, absolutely. Any strap with a 16mm lug width is compatible with the 178248-0031, provided it is certified artisanal quality. Aftermarket straps from specialised leather brands—such as those available on Milano Straps for this size—offer aesthetic and functional versatility compared to the original Rolex strap, enabling seasonal rotation and customisation without compromising durability.

The lifespan of a leather strap depends on the quality of the tanning and daily use. An authentic alligator strap with vegetable tanning can last 3 to 5 years under intensive daily use, whilst calf leather straps typically have a useful life of 2 to 3 years before replacement is required. Exposure to moisture and perspiration accelerates wear. Casati Milano straps benefit from an 18-month warranty on manufacturing defects and can be revitalised through buckle replacement or leather refinishing.