Rolex
Datejust 31 278274-0029— lug 16mm

The Rolex Datejust 31 ref. 278274-0029 has a lug width of 16mm. This measurement indicates the internal distance between the two lugs of the case and is the key parameter for selecting any compatible aftermarket strap. It should be measured with a digital calliper placed inside the lugs, parallel to the case back.

For a stainless steel and white gold case such as the 278274-0029, belly alligator or shell cordovan leather are the most suitable materials for formal settings, owing to their natural texture and the patina they develop over time. Vegetable-tanned calf leather is the most versatile choice for everyday wear. All straps must have a 16mm straight-ended attachment, compatible with the Oyster case geometry.

To replace the strap on the Datejust 31, a dedicated screwdriver for screw-type spring bars is required (flat-tip or forked spring bar tool). Rolex's original spring bars are threaded and require a specific tool, distinct from standard spring bar tools. It is advisable to work on a soft surface to avoid scratching the case, and to entrust the operation to a watchmaker or authorised dealer if in doubt.

Yes, there are numerous aftermarket straps compatible with the Datejust 31 at 16mm lug width. It is essential that the strap is profiled for Oyster cases with straight ends at the top, and that the replacement spring bars have the correct diameter (typically 1.5mm for this model). Milanostraps.it offers a selection of 16mm straps already verified for compatibility with this watch family.

The lifespan of a leather strap depends on the material, care and intensity of use. A quality alligator strap, kept away from water and prolonged perspiration, can last between 3 and 7 years with regular use. Shell cordovan, thanks to its compact fibre structure, tends to last longer and retain its shape over time. Applying a dedicated conditioner for exotic leathers every 3 to 6 months significantly extends the strap's service life.