Rolex
Datejust 36 116238-0078— lug 20mm

The lug width (also called ansa measurement) of the Rolex Datejust 36 116238-0078 is precisely 20 mm. This dimension is specific to the 36 mm case model and cannot be substituted with other widths. To verify, use a digital calliper to measure the distance between the two lugs on the watch case. Do not confuse lug width with case diameter (36 mm), as these are distinct parameters.

For a yellow gold Datejust 36, the optimal choice is unvarnished alligator leather, preferably tanned using vegetable tannage, in dark brown or black tones. Shell cordovan is an exceptional alternative, offering superior durability and a natural finish that develops character over time. Calf leather is an elegant summer option. Casual materials such as NATO fabric are unsuitable, as they create visual discord with the formal aesthetic of yellow gold.

Strap replacement requires a spring bar tool. Position the tool in the small lateral grooves of the spring bar (the retention mechanism), then gently press to retract it, allowing the strap to be withdrawn from the lug. Reverse the procedure to install the new strap. If unfamiliar with this process, we recommend consulting a certified watchmaker or a specialised service provider such as Casati Milano.

Yes, any strap with a 20 mm lug width is compatible. The lug width is the determining factor, not the watch manufacturer. We recommend selecting straps manufactured to precise tolerances using premium materials—alligator, calf, or shell cordovan—to ensure longevity exceeding 2–3 years and visual coherence with your Rolex's quality standard.

Longevity depends on material quality and wear patterns. A high-grade calf leather strap typically lasts 2–3 years under daily use. Alligator leather extends lifespan to 4–5 years. Shell cordovan, thanks to its fibrous structure, often exceeds 5–6 years of service. Regular maintenance—cleaning and conditioning with natural oils—combined with the use of a deployante buckle significantly reduces friction-related wear and prolongs strap lifespan.