Rolex
Datejust 31 178245f-0033— lug 16mm

The Rolex Datejust 31 ref. 178245f-0033 has a lug width of 16mm. This measurement is taken internally between the two lugs using a digital calliper and is essential for selecting any aftermarket or replacement strap correctly.

For an 18k Everose gold case, the most suitable materials are vegetable-tanned alligator with belly grain — in either polished or semi-matte finish — and shell cordovan for those who prefer a natural patina that develops over time. Both complement the warm tone of the metal without overwhelming it. The strap should be 16mm wide with curved ends to follow the case profile.

Replacing the strap on the Datejust 31 requires a fine-tipped spring bar tool to remove the spring bars securing the original bracelet or strap to the case lugs. It is advisable to work on a soft surface to avoid scratching the gold case. If in doubt, a watchmaker or the Casati Milano atelier can perform the swap safely without any risk to the lugs.

Yes. The Datejust 31 178245f-0033 accepts any standard 16mm strap with standard spring bars. Milano Straps offers a selection of handcrafted compatible straps, made to measure at 16mm and available in various materials and colours. For precious metal case versions, straps with curved ends that follow the case contour are strongly recommended.

The lifespan of a leather strap depends on the material and daily care. A quality vegetable-tanned alligator strap, kept away from prolonged moisture and periodically treated with neutral wax, retains its structural and aesthetic integrity for 3 to 5 years with daily wear. Shell cordovan, thanks to the dense fibrous structure of the membrane, can exceed 5 years, developing a personal patina that enhances its aesthetic value over time.