Rolex
Day-Date 36 118238-0122— lug 20mm

The lug width of the Rolex Day-Date 36 118238-0122 is exactly 20 millimetres. This measurement is determined by the geometry of the 36mm case and the proportion between the lugs. It is essential to measure the lug width correctly before ordering a strap: the distance must be taken between the inner supports where the strap sits. This is not an approximate dimension but a precisely engineered specification.

For a 118238-0122 in yellow gold with a 36mm case, dark brown or cognac alligator represents the aristocratic choice: its natural and symmetrical grain harmonises with the warmth of the gold without competing for visual attention. Alternatively, shell cordovan offers exceptional natural patina and depth that evolves beautifully over time. For lighter contexts, vegetable-tanned calf leather or a silk NATO strap are contemporary choices that maintain aesthetic balance.

Changing the strap on the Day-Date 36 requires precise tools: a fine spring bar tool and a well-lit, flat work surface. Support the case gently, insert the tool into the small hole at the side of the lug to release the internal spring, then extract the lug with smooth, deliberate movements. Repeat on the other side. To install the new strap: align the lug rings with the holes, push them in with gradual pressure until you feel the spring click into position. If unsure, entrust the task to a certified Rolex specialist.

Yes, a quality aftermarket strap with a 20mm lug width is fully compatible with the Day-Date 36 118238-0122. The critical factor is that the lug width meets the exact specification of 20mm and the materials—alligator, cordovan, calf—are certified for durability and resilience. An experienced artisan such as those at Casati Milano guarantees compatibility and construction quality, whilst providing personalised supervision throughout the manufacturing process.

The lifespan of a natural leather strap depends on the materials and usage patterns: alligator or properly tanned shell cordovan can endure 4–7 years with balanced daily wear, whilst lower-grade calf leather typically lasts 2–3 years. Vegetable-tanned leather ages aesthetically well, developing natural patina that increases character over time. Factors such as perspiration, moisture exposure, and rotation frequency influence longevity. Minimal maintenance—drying after rain, avoiding prolonged submersion—significantly extends strap life.