Strap for Datejust 31 Stainless Steel Fluted / Oyster / White - Roman

The lug width of the Rolex Datejust 31 ref. 278274-0009 is 16mm. This measurement is taken with a calliper positioned between the two lugs at their narrowest internal point, where the strap sits. It is important not to confuse this dimension with that of the Datejust 36 (20mm) or the Lady-Datejust 28 (13mm).

For the Datejust 31 278274-0009 in Oystersteel and white gold, a polished alligator strap in black or midnight blue enhances the precious character of the bezel. Shell cordovan is preferable for those seeking durability and progressive patina. Vegetable-tanned calfskin offers a more everyday option with excellent texture. In all cases, the correct width is 16mm, and a deployant clasp in steel or white gold improves visual symmetry.

To replace the strap on the Datejust 31, the spring bars securing the original bracelet or strap to the lugs must be removed. A dedicated springbar tool is used, inserting the tip into the lug hole to compress the spring and release the bar. Care must be taken to avoid scratching the steel case. The new 16mm strap is inserted in the same position, ensuring both spring bars are correctly locked into the lugs on either side.

Yes, numerous aftermarket straps are compatible with the Datejust 31, provided they feature a 16mm lug width. Milano Straps offers handcrafted straps in alligator, shell cordovan, calfskin and rubber, fitted with standard 1.8mm spring bars compatible with the Oyster lugs of this reference. An original Rolex bracelet is not required: Italian artisan quality can match or exceed factory finishing.

The lifespan of a leather strap depends on the material and care taken. A quality alligator strap worn daily and kept away from excess moisture or perspiration typically lasts 2–4 years. Shell cordovan, thanks to its denser fibre structure, can exceed 4–5 years. Vegetable-tanned calfskin has a shorter life (1–3 years) but ages with considerable aesthetic character. Casati Milano straps are covered by an 18-month production defect guarantee.