Rolex
Datejust 31 178383-0019— lug 16mm

The Rolex Datejust 31 reference 178383-0019 has a lug width of 16mm. This is a non-standard size within the Rolex range, narrower than the 19–20mm found on larger models. Before purchasing an aftermarket strap, it is advisable to verify the measurement using a digital calliper by measuring the internal distance between the two lugs.

For the Datejust 31 178383-0019 in Rolesor (stainless steel and yellow gold), alligator straps with a polished finish or vegetable-tanned calfskin straps offer the best aesthetic coherence. Alligator enhances the case texture and complements the yellow gold; vegetable-tanned calf develops an authentic patina over time. A yellow gold PVD deployant clasp completes the material consistency of the ensemble.

Replacing the strap on the Datejust 31 178383-0019 requires a spring bar tool to remove the spring bars securing the bracelet to the 16mm lugs. The operation is fully reversible and does not require any intervention on gaskets or the movement. It is recommended to carry out the swap on a soft surface to avoid scratching the Oystersteel and 18-carat yellow gold case.

Yes. Aftermarket straps with a 16mm attachment are compatible with the Rolex Datejust 31 178383-0019. Milano Straps offers a curated selection of handcrafted straps in this size, available online or made to measure by the Casati Milano atelier. It is important to choose straps fitted with quality spring bars to ensure secure attachment and protect the lug finish.

The lifespan of a leather strap depends on material quality, frequency of use, and exposure to perspiration and moisture. A high-grade alligator or vegetable-tanned calfskin strap, used in rotation and properly maintained (aired regularly, treated with neutral cream), can last between 2 and 5 years while retaining high aesthetic quality. Casati Milano handcrafted straps carry an 18-month warranty against manufacturing defects.