Rolex
Datejust 31 178341-0004— lug 16mm

The Rolex Datejust 31 reference 178341-0004 has a lug width of 16 mm. This measurement is standard across the entire Datejust 31mm family and determines the correct strap width, whether original Rolex or aftermarket. To verify independently, use a calliper to measure the internal distance between the two case lugs.

For the Datejust 31 178341-0004 with its mother-of-pearl dial and Everose gold bezel, the most suitable materials are alligator in nude, powder pink or bordeaux tones — which complement the dial's iridescence — and vegetable-tanned calf leather for everyday wear. A deployant clasp in steel or rose gold completes the pairing elegantly. All compatible models are available in the 16mm strap section at milanostraps.it.

To replace the strap on a Datejust 31, the spring bars securing the strap to the case lugs must be removed. This is done using a dedicated spring bar tool, applying gentle pressure at the lug slot. It is advisable to work on a soft surface to avoid scratching the case. If in doubt, consult a watchmaker or the Casati Milano atelier.

Yes. The Datejust 31 178341-0004 has a 16 mm lug width, a measurement well supported by the quality aftermarket sector. milanostraps.it offers a curated selection of handcrafted straps in alligator, calf leather, NATO nylon and rubber, available bespoke or ready to ship, with spring bars included and verified compatibility with the 31mm Oyster case.

The lifespan of a leather strap depends on material quality and frequency of use. A high-grade alligator or calf leather strap, properly cared for (kept away from water, excessive perspiration and prolonged direct sunlight), maintains its structural and aesthetic integrity for 3 to 5 years with regular wear. Casati Milano offers an 18-month warranty against manufacturing defects. Replacement of the keeper loop is the most common maintenance task.