Rolex
Datejust 31 178240-0034— lug 16mm

The Rolex Datejust 31 reference 178240-0034 has a lug width of 16mm. This measurement is specific to the 31mm case format and requires straps cut to precise millimetre tolerances to ensure a correct, play-free fit between the lugs.

For the steel Datejust 31 with silver dial, the most suitable materials are alligator for formal occasions, vegetable-tanned calf leather for daily wear, and shell cordovan for maximum longevity. The strap must have a 16mm attachment and a steel buckle or deployant clasp to maintain aesthetic coherence with the Oyster case.

To replace the strap on the Datejust 31, you will need a spring bar tool and a suitable screwdriver. The spring bars securing the original bracelet or strap to the lugs must be compressed laterally to release. The operation can be carried out by a watchmaker or independently with the correct tools. Take care not to scratch the lugs during the procedure.

Yes, high-quality aftermarket straps compatible with the Rolex Datejust 31 at 16mm lug width are available. milanostraps.it offers a selection of artisanal straps in 16mm, crafted from selected leathers with precision keepers, fully compatible with reference 178240-0034 without any modification to the case or lugs.

The lifespan of a leather strap depends on the material, care, and intensity of use. A quality alligator strap, properly maintained and rotated with other straps, can last over five years while retaining structural integrity and colour. Vegetable-tanned calf leather develops a patina over time but requires periodic conditioning. Shell cordovan is the most resistant to deformation and can last seven to ten years with regular maintenance.