Rolex
Day-Date 36 118348-0040— lug 20mm

The lug width of the Rolex Day-Date 36 118348-0040 is 20 millimetres. This dimension is specific to this model and ensures that an aftermarket strap is compatible only if constructed with a 20 mm lug width. Correct measurement is performed with a digital calliper on the inner face of the lug, edge to edge at the narrowest point.

For a Day-Date 36 in yellow gold, the ideal strap is alligator in dark brown or shell cordovan. Alligator with fine grain enhances the gold without competing visually, whilst shell cordovan creates an affinity of construction quality. Vegetable-tanned calf leather also delivers excellent results thanks to the natural patina it develops over time.

Strap replacement is performed by extracting the lateral pins from the case using a dedicated tool (spring bar removal tool). After locating the pins (one per side, beneath the lugs), apply gentle inward pressure and extract the strap. Installation of the new strap follows the reverse procedure. If uncertain, consult a certified watchmaker or Casati Milano's service.

Yes, any strap manufactured with a 20 millimetre lug width is compatible with the Day-Date 36 118348-0040, provided the width and thickness of the leather are proportionate to the case lugs. A poorly constructed strap may present excessive play or, conversely, difficult fitting. To guarantee complete compatibility, milanostraps.it straps are tested on this reference.

The lifespan of a leather strap depends on material quality, frequency of use and care. A high-quality alligator or shell cordovan strap typically lasts 3–5 years with regular wear. Vegetable-tanned calf can last 2–3 years before requiring replacement. With regular cleaning (damp cloth) and protection from excessive moisture and direct sunlight, longevity increases significantly. Casati Milano guarantees 18 months against manufacturing defects.