Rolex
Day-Date 40 228239-0076— lug 20mm

The Rolex Day-Date 40 228239-0076 is equipped with a 20-millimetre lug width. This measurement is specific to the 40mm model and ensures perfect fitment between the case and the strap. To verify compatibility with an aftermarket strap, measure the internal distance between the two lugs on the case: it must be exactly 20mm.

For a Day-Date 40 228239-0076, an alligator strap in dark chocolate brown is the most harmonious choice with white gold, creating an elegant and understated contrast. Burgundy shell cordovan develops a patina that ages nobly, ideal for evening occasions. Vegetable-tanned calf offers versatility and a golden colour evolution over time. For sports use, natural FKM rubber maintains waterproofing and flexibility.

The Day-Date 40 228239-0076 uses spring bars. Using a dedicated tool, gently press the spring bar into the lower seat to release the old strap. Insert the new strap by aligning the lug ends with the case holes, then release the spring bar. Verify that the spring bar is fully engaged on both sides. If inexperienced, Casati Milano offers the changing service at the atelier by appointment.

Yes, any strap with a 20mm lug width is compatible with the Day-Date 40 228239-0076. Milano Straps offers a wide range of 20mm straps in various materials: alligator, shell cordovan, vegetable-tanned calf and rubber. All straps are tested for compatibility and available online or customisable through Casati Milano.

The lifespan of a leather strap depends on the material and usage. A high-quality alligator or shell cordovan lasts 4–6 years with daily wear, developing an appreciated patina. Vegetable-tanned calf has a similar lifespan but absorbs more moisture. With regular maintenance (gentle cleaning, drying after perspiration, protection from heat sources), longevity extends considerably. Milano Straps guarantees 18 months on manufacturing defects for Casati Milano straps.