Strap for Rolex Datejust 31 178343

The Rolex Datejust 31 ref. 178343 features a 16mm lug width. This measurement is specific to the 31mm women's and unisex Datejust models. Correct measurement is taken by placing a digital calliper parallel to the dial, between the two lug shoulders, to ensure compatibility with aftermarket straps.

For the Datejust 31 178343 in Rolesor bicolour (steel and yellow gold), alligator in warm tones (cognac, tobacco brown, burgundy) represents maximum elegance. Shell cordovan offers superior durability and an intrinsic lustre that dialogues perfectly with the gold finish. Vegetable-tanned calf allows a patina that evolves over time. NATO or rubber materials remain incongruent with Rolesor aesthetics.

Changing the strap on the Datejust 31 178343 requires removing the existing bracelet or strap by extracting the articulation pins from the lugs using a spring bar tool. Next, insert the pins into the new strap and secure them to the lugs, ensuring the strap is 16mm wide. If inexperienced, consult an authorised Rolex service centre or a specialist craftsman such as Casati Milano.

Yes, an aftermarket strap is compatible provided the lug width is precisely 16mm and the articulation pins are correctly dimensioned (16mm standard). Caution: an 18mm or 14mm strap will not enter the lugs and will block closure. We recommend straps in noble materials (alligator, shell cordovan, calf) to maintain the luxury standard of the Rolesor case.

The durability of a leather strap depends on material and wear. Quality alligator with 1.4–1.6mm thickness lasts approximately 4–6 years with moderate wear. Shell cordovan exceeds 7–8 years thanks to densified fibres. Vegetable-tanned calf has an average lifespan of 3–5 years. With Casati Milano, every strap is covered by an 18-month warranty on manufacturing defects, though real durability also depends on care (avoid water, perfume, excessive heat).