Strap for Datejust 31 Stainless Steel Domed / Pink / Pink

The Rolex Datejust 31 ref. 178240-0028 has a lug width of 16mm. This measurement should be taken at the base of the lugs using a digital calliper, not at the tapered tip. The 16mm figure defines the strap width at the upper attachment point; the tail end may be tapered to 14mm depending on aesthetic preference.

For the steel Datejust 31, the most suitable options are vegetable-tanned calf leather for classic everyday wear, bombé alligator for formal occasions, or shell cordovan for superior durability with refined aesthetics. The choice depends on intended use and dial colour: warm tones (brown, cognac, beige) pair well with light dials; black alligator complements virtually any configuration.

To replace the strap on the Datejust 31, a 1.8mm or narrower springbar tool is required. Insert the tool into the lug notch, compress the springbar and slide the strap free. Care must be taken to avoid scratching the 904L stainless steel case: it is advisable to protect the case flanks with PTFE tape or to entrust the operation to a watchmaker or the Casati Milano atelier.

Yes. The aftermarket sector for 16mm lug widths offers leather, rubber, nylon and metal options fully compatible with the Datejust 31. milanostraps.it lists a curated selection of handcrafted 16mm straps sized for this case diameter. It is important to verify that the strap's end-piece profile matches the curvature of the Rolex lug to ensure a precise, play-free fit.

Strap longevity depends on material and care. A quality vegetable-tanned calf strap worn daily typically lasts 2–4 years; a hand-finished alligator strap can last 4–6 years or more if kept away from water and heavy perspiration. Shell cordovan, owing to its dense fibre structure, generally outlasts most bovine leathers. Casati Milano provides an 18-month guarantee against manufacturing defects on every strap.