Rolex
Datejust 31 278245-0020— lug 16mm

The Rolex Datejust 31 reference 278245-0020 has a lug width of 16mm. This is the specific measurement for the 31mm case format. Before purchasing an aftermarket strap, it is advisable to verify the internal distance between the lugs using a digital calliper, which should read between 15.8 and 16.2mm.

For the Everose gold case of the 278245-0020, the most suitable materials are square-scale Mississippi alligator leather for formal occasions, vegetable-tanned calf leather for daily wear — it develops a patina that complements the warmth of the gold — and shell cordovan for those seeking durability and a smooth surface texture. Vulcanised rubber is appropriate for summer and sporting contexts.

The strap on the Datejust 31 is secured to the case via 16mm spring bars inserted into the lugs. Replacement requires a fine-tipped spring bar tool to compress and remove the bars. It is recommended to work on a soft surface to protect the gold case surfaces, and to avoid forcing the lugs, which are an integral part of the precious metal case.

Yes. Aftermarket straps compatible with the Datejust 31 278245-0020 must have a 16mm attachment width and may be in leather, rubber or fabric. Milano Straps offers handcrafted straps made to the correct lug width, with options to personalise colour, stitching, and buckle or deployant clasp in various metals and finishes.

The lifespan of a leather strap depends on the material, frequency of use, and care. An alligator strap with correct tanning and protective finishing typically lasts between 3 and 5 years with regular use. Vegetable-tanned calf leather can last over 4 years while developing character. Shell cordovan, due to its dense fibre structure, offers the greatest long-term resistance. All Milano Straps straps carry an 18-month warranty against manufacturing defects.