Rolex
Datejust 31 178279-0067— lug 16mm

The Rolex Datejust 31 reference 178279-0067 has a lug width of 16mm. This measurement must be taken internally between the lugs using a calliper or spring bar tool — not from the factory strap. This is a precise dimension requiring straps manufactured to tight millimetre tolerances to ensure a proper, play-free fit.

For an 18kt white gold case of 31mm diameter, an alligator strap with vegetable tanning offers the most coherent formal pairing: the organic grain of the belly offsets the cold brilliance of the metal. Alternatively, box-calf leather in black or dark brown provides a more understated aesthetic. Shell cordovan suits those seeking a rich patina with controlled thickness, well-proportioned to the slim 16mm lugs.

Changing the strap on a Datejust 31 requires a fine-tipped spring bar tool to release the spring bars from the lugs. It is recommended to work on a padded surface to avoid scratching the white gold case. Original Rolex spring bars have a specific diameter: when fitting an aftermarket strap, verify compatibility with both the spring bar diameter and the exact 16mm internal lug width.

Yes. The aftermarket offers compatible straps with 16mm lug width in various materials: artisan leather (alligator, calf, cordovan), vulcanised rubber, and nylon NATO straps. Compatibility depends on the precise 16mm lug width and the strap end profile, which must follow the curved case geometry. Artisan manufacturers such as Casati Milano produce bespoke straps tailored to this specific reference.

The lifespan of a leather strap depends on the material, tanning quality, and daily use. A quality vegetable-tanned alligator strap with a noble metal buckle and waxed thread stitching can last between 3 and 7 years with standard care — avoiding prolonged contact with water and perspiration. Shell cordovan tends to last longer due to its dense fibre structure. Milano Straps provides an 18-month warranty against manufacturing defects.