Rolex
Datejust 31 178273-0013— lug 16mm

The Rolex Datejust 31 178273-0013 has a lug width of 16mm. This measurement is taken internally between the two lugs at the point where the spring bar inserts. It is a non-standard dimension compared to larger Datejust references, so it is essential to select straps specifically manufactured for 16mm lugs.

For the Datejust 31 178273-0013 in yellow gold Rolesor, a vegetable-tanned alligator strap in cognac or tobacco is the most coherent aesthetic choice: the natural symmetric scale grain complements the gold bezel and develops a personal patina over time. A smooth calf leather strap in black or dark brown offers a more restrained formal alternative. For sport or marine use, a vulcanised rubber strap in 16mm is the most technically appropriate option.

To replace the strap on a Datejust 31, the spring bars connecting the bracelet or strap to the case lugs must be removed. A fine-tipped springbar tool is inserted into the notch on the spring bar and pressed inward to compress it. Care must be taken not to scratch the steel or gold lugs. If removing an original Oyster bracelet, it is advisable to seek the assistance of a watchmaker or specialist atelier.

Yes. Aftermarket straps compatible with the Datejust 31 178273-0013 must have a 16mm attachment width and a length proportionate to a 31mm case. Milano Straps produces handcrafted straps in 16mm in various materials — alligator, calf leather, shell cordovan, rubber and NATO — with selectable finishes and linings. The tail width is typically 14mm to ensure a correct fit with a standard buckle.

The longevity of a leather strap depends on the material, tanning quality and daily use. A high-quality vegetable-tanned alligator strap, with regular but non-sporting use, typically lasts 3–5 years before the internal fibre shows structural wear. Calf leather and cordovan have comparable durability. Frequent exposure to perspiration, water or perfume accelerates deterioration: rotating between multiple straps and avoiding prolonged contact with liquids is strongly recommended.