Rolex
Datejust 31 178279-0082— lug 16mm

The Rolex Datejust 31 ref. 178279-0082 features a lug width of 16mm. This is a non-standard size in mass production: to verify it precisely, use a digital calliper to measure the internal distance between the two lugs, flush against the case back.

For an 18-carat white gold case, a porosus alligator strap with vegetable tanning is the most aesthetically coherent choice, as the regular scale grain echoes the knurled bezel. Alternatively, smooth bombé calf leather or shell cordovan offer distinct character and durability. The 16mm lug width requires a bespoke strap or one specifically designed for this dimension.

To replace the strap on the Datejust 31, you will need a fine-tipped spring bar tool. The spring bars are released by applying gentle pressure in the lug holes. Work on a soft surface to protect the white gold case from scratches. If you are inexperienced, it is advisable to rely on a watchmaker or a specialist atelier such as Casati Milano.

Yes, there are high-quality aftermarket straps specifically designed for the 16mm lug width compatible with this model. Milano Straps offers a selection of 16mm straps in various materials — alligator, calf, NATO, rubber — crafted by hand and fully compatible with the Datejust 31 lugs. It is essential to ensure that the spring bars have the correct diameter to avoid damaging the white gold lugs.

The lifespan of a leather strap depends on the material, care and daily use. A quality vegetable-tanned porosus alligator strap, used carefully away from moisture and stored correctly, can last between 3 and 5 years before requiring replacement. Calf leather straps typically have a shorter lifespan (1–3 years) but develop a distinctive patina over time. Milano Straps offers an 18-month warranty against manufacturing defects on all Casati Milano straps.