Rolex
Datejust 31 178274-0064— lug 16mm

The Rolex Datejust 31 reference 178274-0064 has a lug width of 16mm. This measurement should be taken with a calliper positioned between the inner faces of the lugs, flush against the case. It is specific to this 31mm variant and differs from the 18mm of the Datejust 36 and the 20mm of the Datejust 41. Verifying this figure before purchasing any aftermarket strap is essential to ensure correct fitment.

For a Datejust 31 in stainless steel and white gold, a square-scale alligator strap with a glossy finish is the most coherent choice for the watch's formal register. Shell cordovan in cognac or burgundy is a more personal option, developing a distinctive patina over time. For less formal contexts, a hand-finished vegetable-tanned calfskin strap offers refined everyday elegance. In all cases, the 16mm lug width must be respected to preserve the proportional balance of the 31mm case.

To replace the strap on a Rolex Datejust 31, a fine-tipped spring bar tool is required. The two 16mm spring bars are compressed by acting on the lateral notches of the lugs, releasing the strap from the case. Care must be taken not to scratch the white gold or steel surfaces. It is advisable to work on a soft mat and to replace the spring bars if they show signs of wear, to prevent accidental release.

Yes, the aftermarket offers high-quality straps compatible with the Rolex Datejust 31 178274-0064, provided they respect the 16mm lug width. Milano Straps offers a selection of handcrafted straps in alligator, calfskin, shell cordovan and rubber, available bespoke or ready to purchase online. Dimensional compatibility is guaranteed, and the quality of materials and finishing is comparable — in many cases superior — to original straps in terms of aesthetic personalisation.

The lifespan of a leather strap depends on the material, frequency of use and exposure to moisture and perspiration. A quality alligator strap, rotated regularly and kept away from water, can last between 3 and 7 years whilst retaining its structural integrity and appearance. Shell cordovan, owing to the density of its fibrous structure, tends to withstand daily wear particularly well, developing a characteristic patina. A vegetable-tanned strap benefits from occasional treatment with neutral wax to preserve its suppleness. Casati Milano's craftsmanship warranty covers 18 months against manufacturing defects.