Rolex
Datejust 31 178274-0040— lug 16mm

The Rolex Datejust 31 reference 178274-0040 has a lug width of 16 mm. This measurement refers to the internal distance between the two lugs of the Oyster case and should be verified with a digital calliper before purchasing any aftermarket strap to ensure a precise fit.

For this reference featuring a mother-of-pearl dial and Rolesor case, an alligator belly strap in vegetable-tanned leather is the most coherent aesthetic choice. The natural grain texture complements the iridescent depth of the mother-of-pearl without competing with it. Shell cordovan offers a refined, smooth finish that develops a rich patina over time, while box-calf leather is recommended for intensive daily wear. A deployant clasp in white gold or brushed steel completes any of these options with visual symmetry.

To remove the original strap or bracelet from the Datejust 31, a fine-tipped springbar tool is required. The 16 mm lugs accommodate springbars with a standard 1.5 mm diameter. Insert the tool tip into the lug hole, compress the springbar and slide the strap free. Always work on a soft surface to prevent scratches to the case or caseback. For models fitted with an Oyster or Jubilee bracelet, a dedicated quick-release tool is advisable.

Yes. The Datejust 31 178274-0040 accepts any strap with a 16 mm lug width and standard 1.5 mm springbars. Milanostraps.it offers a curated selection of handcrafted straps in 16 mm width, available both as bespoke orders and ready-to-ship options, all compatible with the straight lug geometry of the Oyster case. It is essential to ensure the strap has a straight — not curved — end to fit correctly.

Strap longevity depends on the material, craftsmanship and frequency of wear. A high-quality vegetable-tanned alligator strap, regularly conditioned with a neutral leather cream, will maintain its structural and aesthetic integrity for 3 to 5 years under frequent use. Box-calf leather offers comparable durability but is more susceptible to moisture. Shell cordovan, owing to its dense fibre structure, is the most durable among smooth leathers. Casati Milano provides an 18-month warranty against manufacturing defects.