Strap for Datejust 31 Stainless Steel Diamond / Oyster / Silver

The Rolex Datejust 31 ref. 178384-0043 has a lug width of 16 mm. This measurement is specific to the 31 mm case size and differs from the Datejust 36 or 41. To verify it accurately, use a digital calliper measured internally between the two lugs with the case resting flat on a surface.

For the white Rolesor case of the Datejust 31, the most appropriate strap is a vegetable-tanned alligator — square scale or hornback — in ivory, burgundy or navy. Smooth calfskin with a polished finish is an elegant alternative. Shell cordovan is recommended for those seeking a long-term natural patina. All straps must feature a 16 mm lug width with curved ends compatible with the case profile.

Replacing the strap on the Datejust 31 requires a fine-tipped spring bar tool suitable for 16 mm spring bars. Compress the spring bar laterally within the lug channel, remove the strap, then fit the new one by seating one spring bar at a time. This is a delicate operation: to avoid scratching the white gold case, it is advisable to consult a watchmaker or a specialist atelier.

Yes. The quality aftermarket offers straps in alligator, calfskin, shell cordovan and rubber with a 16 mm lug width compatible with the Datejust 31. Milano Straps provides both ready-to-ship online references and the bespoke Casati Milano service for handcrafted straps with full material selection and choice of buckle or deployant clasp.

Longevity depends on the material and frequency of use. A vegetable-tanned alligator strap, kept dry and rotated with other straps, typically lasts 3 to 5 years before showing structural wear. Calfskin has a shorter lifespan (18 to 36 months with intensive daily use). Shell cordovan is the most durable among classic leathers. Milano Straps provides an 18-month guarantee against manufacturing defects on all handcrafted straps.