Rolex
Day-Date 36 118135-0087— lug 20mm

The lug width of the Day-Date 36 reference 118135-0087 is precisely 20 millimetres. This measurement represents the distance between the two metal lugs that insert into the case bars. Verification of this dimension to the nearest millimetre is essential when ordering a replacement strap, as incorrect tolerances can introduce structural stress on the case.

Alligator leather with vegetable tanning in cognac or dark brown tones is the most aesthetically aligned choice for rose gold, as it amplifies the metal's warmth and develops natural patina over time. Taurillon calf and shell cordovan represent equivalent quality alternatives. For informal applications, rubber or NATO straps maintain correct visual proportion.

Strap replacement requires a specialised tool called a spring bar removal tool. Position the watch horizontally on the work surface, insert the bifurcated tip beneath the pin supporting the strap, apply steady pressure until the pin retracts from the lugs, and carefully extract the worn strap. Insert the new strap by aligning the pins with the case bars. This delicate operation warrants the expertise of a qualified watchmaker to prevent scratching the case.

Yes, provided the lug width is precisely 20 millimetres and the material thickness does not exceed 3.5 millimetres—the tolerance within which the pin engages smoothly with the case bars. Straps from specialised suppliers (Hermès, Barenia, Cordovan, NATO) are compatible. Always verify specific dimensions prior to ordering.

A high-quality alligator or calf leather strap (Hermès specifications) typically lasts 4 to 6 years under daily wear, contingent upon periodic maintenance including prompt drying after moisture exposure and application of conditioning wax every six months. Shell cordovan, due to superior structural density, can achieve 7 to 9 years of service. The deployante will wear before the strap itself and may require replacement within 3 to 4 years.