Rolex
Datejust 31 178278-0128— lug 16mm

The Rolex Datejust 31 ref. 178278-0128 features a lug width of 16mm, measured internally between the two lugs at the point of contact with the case. This dimension is specific to the 31mm midsize format and differs from larger Datejust references.

For the yellow gold version, the most suitable straps are vegetable-tanned alligator in deep bordeaux or cognac tones, or shell cordovan which develops a warm patina over time. Alternatively, black box-calf leather offers a refined contrast for formal wear. A yellow gold deployant clasp completes the metallic pairing with consistency.

To remove the original bracelet or strap from a Rolex Datejust 31, a fine-tipped spring bar tool is required, inserted into the internal lug slot to release the spring bars. It is advisable to work on a soft surface to protect the gold case. If in doubt, consult a qualified watchmaker.

Yes. Aftermarket straps for the Datejust 31 must measure 16mm at the lug attachment, with shaped ends to follow the downward taper of the lugs. On milanostraps.it, handcrafted straps are available made to this specific geometry, fully compatible with ref. 178278-0128 without any modifications required.

The lifespan of a leather strap depends on material quality and care. A high-quality vegetable-tanned alligator strap, with daily use and proper maintenance (kept away from water and perfume), typically lasts 2–4 years. Shell cordovan, due to its dense fibrous structure, tends to last longer, developing a patina rather than deteriorating. Casati Milano offers an 18-month guarantee against manufacturing defects.