Rolex
Datejust 31 178343-0055— lug 16mm

The Rolex Datejust 31 reference 178343-0055 has a lug width of 16mm. This measurement, taken with a digital calliper between the inner walls of the lugs, is the specification required when ordering any compatible aftermarket strap.

Given the two-tone Rolesor configuration of the 178343-0055, an alligator strap with Mississippiensis grain or a vegetable-tanned box-calf leather strap offers the most coherent aesthetic match. A deployant clasp in yellow gold or stainless steel completes the pairing with proper pressure distribution across the wrist.

Replacing the strap on a Datejust 31 requires a fine-tipped spring bar tool, inserted into the lug holes to compress the spring bars and release the existing bracelet or strap. It is advisable to entrust this operation to a watchmaker or specialist atelier to avoid scratching the polished gold or Oystersteel surfaces.

Yes. Aftermarket straps with a 16mm lug width are fully compatible with the Datejust 31 178343-0055, provided they follow the correct tapered geometry and are sized appropriately for the wearer's wrist circumference. Milanostraps.it offers a curated selection of handcrafted 16mm straps in various materials, with standard Rolex spring bar attachment.

Longevity depends on the material and daily use. An alligator strap in vegetable-tanned leather, properly maintained with conditioning cream and rotated with other straps, retains its structural and aesthetic integrity for between three and five years. Shell cordovan, owing to the density of its fibres, tends to last considerably longer. Prolonged exposure to water, perspiration and direct sunlight significantly shortens the strap's lifespan.