Rolex
Datejust 31 178273-0006— lug 16mm

The Rolex Datejust 31 reference 178273-0006 has a lug width of 16mm. This measurement is taken with a digital calliper between the two lugs at their narrowest point, closest to the case. It is the standard lug width for the Datejust 31 family and determines compatibility with any aftermarket strap.

For the Datejust 31 178273-0006 in yellow Rolesor, a belly-cut alligator strap with a glossy finish is the most coherent choice with the aesthetic of the fluted gold bezel. Alternatively, vegetable-tanned calf leather offers a natural patina and superior everyday wearability. A deployant clasp in yellow gold or steel is recommended to preserve the strap's structure over time.

To replace the strap on the Datejust 31, you need a 16mm spring bar. Using a fine-tipped spring bar tool, compress the ends of the spring bar seated inside the case lugs and slide out the existing strap. The operation takes approximately two minutes per side and does not require specialist watchmaking skills, provided proper tools are used to avoid scratching the lugs.

Yes. Any strap with a 16mm attachment is technically compatible with the Datejust 31 178273-0006. Milanostraps.it offers a curated selection of handcrafted straps made specifically for this lug width, in leather, alligator, shell cordovan and other materials, with shaped ends to fit the geometry of Oyster lugs. The Casati Milano atelier also produces bespoke made-to-measure pieces.

The lifespan of a leather strap depends on the material and conditions of use. A quality alligator strap, vegetable-tanned and worn daily with moderate exposure, retains its structural and aesthetic integrity for 3 to 5 years. Calf leather has a slightly shorter average lifespan but develops a characteristic patina that many collectors value. Prolonged exposure to perspiration, water and heat is the primary factor in accelerated deterioration.