Rolex
Day-Date 36 118138-0057— lug 20mm

The lug width of the Rolex Day-Date 36 118138-0057 is 20 millimetres. This dimension is specific to this watch family and represents the useful spacing between the two lateral lugs of the case. It is essential to verify this measurement before ordering a compatible strap, as an incorrect size would compromise the structural attachment and stability of the watch on the wrist.

For the Day-Date 36 118138-0057 in yellow gold, alligator leather with medium vertical grain represents the optimal choice: the elegant grain mirrors the classical geometry of the case, whilst the durability of tropical leather ensures resistance to daily wear. Vegetable-tanned calf offers an excellent alternative with uniform texture and a honey patina that harmonises magnificently with 18-carat gold. Shell cordovan remains valid for those who appreciate its distinctive brilliance and inherent water resistance.

Strap replacement requires a spring bar tool (a specialized device for removing internal spring bars). Insert the tool into the small lateral holes beneath the lugs to compress the internal springs and release the strap from the case bars. When inserting the new 20mm strap, verify that the springs engage correctly into the opposite holes. It is advisable to perform this operation on a soft surface to avoid scratching the case.

Yes, you may use aftermarket straps with a 20mm lug width, provided they are manufactured to equivalent quality standards and construction methods. Milano Straps offers handcrafted straps in alligator, vegetable-tanned calf and shell cordovan, all compatible with the 20mm lug width. It is essential to select a manufacturer that understands the specific construction details of the Day-Date, including the correct positioning of anchor pins.

The lifespan of a natural leather strap depends upon intensity of use and maintenance. High-quality artisanal alligator or calf exhibits durability of approximately 3–5 years of daily use before significant wear appears at the bend point. Shell cordovan offers superior longevity (5–7 years) owing to fibre density. Proper maintenance—rapid drying after moisture exposure and storage away from direct heat—substantially extends strap service life.