Rolex
Day-Date 36 118388-0037— lug 20mm

The lug width of the Rolex Day-Date 36 reference 118388-0037 is 20 millimetres. This measurement is standardised across the entire Day-Date 36 collection and is compatible with universal 20mm straps. To verify the lug width accurately, use a digital calliper and measure the distance between the two horizontal lugs on the case.

For the yellow gold Day-Date 36 model 118388-0037, alligator leather with vegetable tanning represents the most versatile choice: the natural grain and supple texture deliver formal elegance without compromising authenticity. Shell cordovan is ideal for evening wear due to its structural rigidity and the patina that develops over time. Box calf offers uniform, measured grain, whilst natural vulcanised rubber is perfect for sporting or summer contexts.

To change the 20mm strap on a Day-Date 36, you require specific tools: a high-quality spring bar tool and a stable work surface. Gently insert the tool tip into the groove of the pin that secures the spring bar, applying steady downward pressure until the bar detaches. Proceed with extreme caution to avoid scratching the yellow gold case. If you lack competence, contact an authorised Rolex service centre or a specialist atelier such as Casati Milano.

Yes, the Day-Date 36 with a 20mm lug width is fully compatible with quality aftermarket straps, provided the lug width is precisely 20 millimetres. Artisanal straps in alligator, shell cordovan, calf and rubber from specialist suppliers fit the Oyster case perfectly. It is essential to verify the lug width before purchase and to rely on manufacturers who guarantee constructive precision and impeccable finishing.

A high-quality natural leather strap, crafted from materials such as alligator or shell cordovan and vegetable-tanned, has an average lifespan of 3–5 years with daily wear. Longevity depends on factors such as moisture exposure, cleaning frequency and intensity of use. Periodic maintenance—gentle drying after bathing, soft cloth cleaning, annual conditioning—significantly extends useful life. Straps in natural vulcanised rubber offer superior durability in humid conditions and have a useful life of 7–10 years.