Rolex
Day-Date 36 118348-0180— lug 20mm

The lug width (width between the lugs) of the Rolex Day-Date 36 118348-0180 is precisely 20 millimetres. This measurement is the distance between the inner shoulders of the two lugs on the case. A compatible strap must measure exactly 20 mm in width to ensure proper fitting without play or instability. To measure accurately, use a digital calliper and position it between the two lugs, verifying the available space.

For a Day-Date 36 in yellow gold, American alligator represents the most refined and durable choice. The natural grain of alligator mississippiensis creates subtle texture that does not compete with the lustre of gold, and develops a dark patina over time that further emphasises the yellow finish. Vegetable-tanned calf leather is a sophisticated alternative, with pronounced ageing characteristics. Shell cordovan offers distinctive crystalline structure and a natural cognac colour that harmonises chromatically with yellow gold.

To change the strap on a Rolex Day-Date 36, you must remove the spring bars (bayonet-type bars) from the lugs of the case. Use a dedicated spring bar removal tool—never improvised screwdrivers, which risk damaging the gold. Extract the spring bar from one lug, then repeat from the other. Insert the new strap, aligning it correctly with the lugs, then reinsert the spring bars until you hear a click indicating proper seating. Verify that the strap is stable and symmetrical. If you lack experience, consult a certified watchmaker.

Yes. Any strap with a 20 mm lug width is compatible with the Day-Date 36 118348-0180. Bespoke straps crafted by specialist artisans in alligator, calf leather, shell cordovan, or NATO fabric are available from dedicated strap makers. Milano Straps offers a curated collection of 20 mm straps in various leathers and finishes, with the option of a bespoke service at the Casati Milano atelier, where you can select leather type, colour, closure style (standard or deployante), and monitor the custom production process.

The lifespan of a leather strap depends on material quality and usage patterns. High-grade alligator, if properly maintained, can last 5–8 years of daily wear before requiring replacement. Vegetable-tanned calf tends to wear faster, typically 3–5 years, as it is softer and more permeable. Shell cordovan, thanks to its dense crystalline structure, can exceed 7–10 years. Longevity increases considerably if the strap is rotated with others, reducing constant exposure to moisture and perspiration. Proper maintenance—avoiding immersion in water, applying protective balm occasionally, storing in a dry environment—extends strap lifespan significantly.