Rolex
Datejust 31 178384-0029— lug 16mm

The Rolex Datejust 31 reference 178384-0029 has a lug width of 16mm. This is a non-standard measurement compared to more common Rolex models; always verify the actual distance between the lugs with a digital calliper before purchasing an aftermarket strap.

For the Datejust 31 in white Rolesor, alligator belly straps in cool tones (grey, taupe, écru) or shell cordovan in burgundy offer the finest aesthetic balance. A deployant clasp in steel or white gold PVD is recommended for daily wear. Milano Straps offers a curated selection of handcrafted 16mm straps specifically suited to this reference.

The strap is secured by 1.8mm springbars. Use a dedicated springbar tool — either fork-tip or pin-tip — applying pressure within the lug recess without touching the case surface. Work on a soft mat to avoid scratches, and if in doubt, consult a watchmaker or visit the Casati Milano atelier.

Yes. Several artisan manufacturers produce straps with a 16mm lug width and an end-piece profile suited to the Datejust 31 lugs. Milano Straps offers a carefully selected range of leather, rubber and nylon straps with correctly profiled ends that fit the case without play or undue tension.

Longevity depends on the material and conditions of use. A quality alligator or shell cordovan strap, kept away from water, excessive perspiration and direct heat, typically lasts 2–4 years with daily wear. Vegetable-tanned calfskin develops a personal patina and offers comparable longevity if not regularly exposed to moisture. Milano Straps provides an 18-month warranty against manufacturing defects on all Casati Milano straps.