Rolex
Day-Date 36 118389-0122— lug 20mm

The lug width of the Rolex Day-Date 36 118389-0122 is 20 mm. This measurement is taken between the two lugs at the point where the strap attaches to the case and is the standard dimension to use when purchasing any compatible aftermarket strap.

For an 18-carat white gold case, the most suitable strap is alligator leather with vegetable tanning, preferably in midnight blue, cognac, or black. The alligator's scaled texture pairs well with the polished surface of white gold. Shell cordovan is a high-end alternative offering a denser, more structured finish. A deployant clasp is recommended to maintain the formal symmetry of the wrist presentation.

To replace the strap on a Rolex Day-Date 36, use a fine-tipped springbar tool to compress and remove the springbars that secure the strap to the case lugs. Insert the tool tip into the small notch on the side of the lug, compress the springbar, and slide the strap free. Care must be taken to avoid scratching the white gold case; it is advisable to protect the lug area with masking tape before proceeding.

Yes, there is a wide selection of high-quality aftermarket straps compatible with the Rolex Day-Date 36 118389-0122. The 20 mm lug width is one of the most widely supported sizes among artisan strap makers. Milano Straps and the Casati Milano atelier produce bespoke straps in alligator, calf leather, shell cordovan, and other fine materials, with customisable finishes and clasps designed to complement this case profile.

The lifespan of a leather strap depends on material quality, frequency of wear, and daily care. A high-quality vegetable-tanned alligator strap, worn in rotation with other straps, can last between three and seven years while maintaining an excellent appearance. Prolonged exposure to perspiration, water, and UV rays accelerates deterioration. It is advisable to avoid water contact, occasionally apply a leather conditioner, and store the strap away from direct sunlight when not in use.