Rolex
Datejust 31 178344-0019— lug 16mm

The lug width of the Rolex Datejust 31 ref. 178344-0019 is precisely 16 millimetres. This measurement represents the distance between the two internal pins that attach the strap to the case. To verify correctly, position a ruler between the inner shoulders of the pins, aligning it with the hole closest to the case edge. A compatible strap must mount without any residual space and without forcing.

Alligator with vegetable tanning is the most appropriate choice for the Datejust 31 178344-0019, respecting Rolex tradition and the sophistication of the two-tone case. Calf leather represents a practical alternative for daily use while maintaining formal elegance. Shell cordovan is ideal for those who appreciate progressive softening over time. In summer, a rubber or NATO strap offers versatility without compromising the sporty-elegant character of this timepiece.

To change the strap, you must remove the spring bars that attach the strap to the case lugs. Use a dedicated spring bar tool gently, positioning it under the pin to compress the internal spring. Once the pin is extracted, you can slide off the old strap. Insert the new strap at the top, position the pin between the two lugs and press it upward until you feel it click into place. Repeat on the other side. If uncertain, entrust the operation to a professional to avoid damaging your watch.

Yes, it is completely possible and common. An aftermarket strap with a 16-millimetre lug width is compatible with the Datejust 31 ref. 178344-0019. However, it is essential to choose a strap made by craftsmen who understand the proportions of this case: poor material or imprecise workmanship can compromise the wearing experience and longevity of your watch. Opt for quality leather, precise stitching and finishes coherent with Rolex standards.

The lifespan of a leather strap depends on use and material quality. Premium alligator or calf leather with vegetable tanning typically lasts between 3 and 5 years under regular wear, developing a fascinating patina over time. Factors such as humidity, direct sun exposure, perspiration and frequency of wear influence longevity. A rubber strap, being more resistant, can last 5-7 years. With proper maintenance (regular cleaning, protection from intense sunlight), useful life extends considerably.