Rolex
Day-Date 36 118139-0081— lug 20mm

The lug width of the Rolex Day-Date 36 118139-0081 is 20 millimetres. This measurement represents the internal distance between the two lugs of the case where the strap is attached. To verify the compatibility of an aftermarket strap, measure with a digital calliper the internal distance between the lugs: it must be exactly 20mm. Never confuse this measurement with the case diameter (36mm); they are independent parameters.

Alligator remains the material of choice for the Day-Date 36 in white gold. The uniform grain texture of alligator creates an elegant visual contrast with the geometric geometry of the precious case. Shell cordovan (horse leather) is an excellent alternative for those seeking greater wear resistance and a deeper patina over time. A strap in vegetable tanning—whether alligator or calf—is recommended because it naturally evolves in colour and character, synchronising with the oxidation of white gold.

The Rolex Day-Date 36 naturally mounts an original Rolex deployante. To remove the strap, position the watch with the caseback facing upwards, locate the spring bar pins (small metal cylinders at the ends of the lugs) and use a dedicated tool—a spring bar tool—to compress the internal spring and extract the pin. If you are unfamiliar with this operation, entrust the task to a certified watchmaker or contact Casati Milano for a personalised strap with guaranteed fitting.

Absolutely yes. The Day-Date 36 118139-0081 accepts any aftermarket strap with a 20mm lug width and standard spring bar pins. Milanostraps offers a comprehensive collection of 20mm compatible straps manufactured from premium materials such as alligator, shell cordovan and calf leather. Casati Milano also provides a personalised atelier service in Milan, where you can select the leather and follow the production process personally.

A high-quality watchmaking leather strap—vegetable tanned—for a Rolex Day-Date 36 used daily lasts approximately 3-5 years before requiring replacement. Lifespan depends on factors such as frequency of use, exposure to moisture, perspiration and sunlight. A structured alligator or shell cordovan resists longer than thin calf leather. Regular maintenance—monthly cleaning with a damp cloth and conditioning with specific watchmaking creams—significantly extends the life of the strap. Casati Milano provides an 18-month warranty on defects in the manufacture of its straps.