Rolex
Datejust 31 178288-0029— lug 16mm

The Rolex Datejust 31 reference 178288-0029 has a lug width of 16mm. This measurement is specific to the 31mm case and should be verified using a calliper gauge measuring the internal distance between the two lugs at the strap attachment point.

For a 31mm yellow gold case, a vegetable-tanned alligator strap is the most coherent choice for formal wear, in cognac, burgundy or black tones. For everyday versatility, a box-calf strap in tobacco brown or midnight blue provides excellent comfort and durability from the very first wear.

The strap is removed using a spring bar tool: insert the forked end into the gap between the lug and the strap keeper to compress the spring bars and release the strap. The process takes approximately two minutes and requires no professional equipment, though it is advisable to work on a soft surface to avoid scratching the case.

Yes. Any aftermarket strap with a 16mm lug width and standard spring bars is compatible with the Datejust 31 178288-0029. Milano Straps and the Casati Milano atelier produce bespoke straps in leather, shell cordovan and other materials, with buckle or deployant clasp, crafted specifically for this lug size.

Longevity depends on the material and frequency of use. A quality alligator strap, with regular care (avoiding direct water contact and applying a neutral leather conditioner every 3-4 months), will maintain its structural and aesthetic integrity for 3-5 years. Calf leather tends to show wear sooner but develops a characterful patina. Shell cordovan, owing to its dense fibre structure, is the most durable of the fine leathers.