Rolex
Datejust 31 178279-0083— lug 16mm

The Rolex Datejust 31 reference 178279-0083 has a lug width of 16mm. This measurement, taken between the inner walls of the two lugs, determines compatibility with any aftermarket or original strap. It is a specific dimension that precludes the direct use of standard 18mm or 20mm straps without adapters.

For an 18-carat white gold case measuring 31mm in diameter, a 16mm alligator strap with a glossy finish represents the most technically and aesthetically coherent choice, as the regular grain complements the fluted bezel. Shell cordovan offers a uniform surface with a progressive patina, while vegetable-tanned calf leather provides immediate suppleness and a noble ageing character suited to refined daily wear.

To replace the strap or bracelet on the Datejust 31, a spring bar tool of appropriate diameter for the 16mm lugs is required. Insert the tool into the side notch of the lug, compress the spring bar, and slide the strap free. Care should be taken to avoid scratching the white gold case: covering adjacent surfaces with masking tape during the procedure is strongly advisable.

Yes. The aftermarket offers a range of 16mm straps compatible with the Datejust 31 178279-0083 in various materials: alligator, calf leather, shell cordovan, NATO nylon, and rubber. Milano Straps provides a curated selection of handcrafted 16mm straps, available with steel or gold-tone buckles or deployant clasps, browsable online or customisable at the Casati Milano atelier.

The lifespan of a leather strap depends on the material, maintenance, and frequency of use. A quality alligator strap, properly conditioned and rotated with other straps, can maintain its structural and aesthetic integrity for 3 to 5 years. Shell cordovan tends to last longer owing to the density of its fibres. Perspiration and prolonged water exposure are the primary causes of deterioration: for intensive use, rubber or nylon alternatives are worth considering.