Rolex
Datejust 36 126201-0018— lug 20mm

The lug width is 20 millimetres. This dimension is specific to the Datejust 36 and represents the proportional standard between the case diameter (36mm) and structural geometry. The distance between the spring bar seats is critical: an undersized strap will generate eccentric tension on the lug, whilst an oversized strap will create unwanted movement during wrist flexion.

The choice depends on usage and aesthetic preference. Alligator in cognac or tobacco brown tones enhances the rose gold presence without competing visually. Shell cordovan offers superior density and noble patina that evolves over three to four years of consistent wear. Calf leather is the conservative choice for fine grain and immediate tactile comfort. For marine environments, FKM rubber is indestructible and hypoallergenic.

Strap replacement requires extraction of the lateral spring bars using a dedicated tool (spring bar tool). Observe the original strap to identify the attachment type: straight pin or terminal pin. Insert the tool into the narrow gap between lug and bar seat, exert controlled pressure to extract the pin, remove the exhausted strap and insert the new one, verifying that the pins snap into position with audible click.

Yes, provided the lug width is precisely 20mm. Aftermarket straps from specialised artisanal manufacturers (such as Casati Milano) guarantee mechanical compatibility and construction quality equivalent to OEM straps. Verify that the bar seat has minimum width of 19.5mm for secure fit without play and that thickness does not exceed 1.8-2mm to prevent binding on the spring bars.

A quality alligator strap resists 5-7 years with moderate daily wear. Shell cordovan, due to superior density, may reach 7-10 years. Calf leather, being thinner and more delicate, has shorter lifespan (3-5 years). Longevity depends on ambient relative humidity, frequency of direct sunlight exposure and periodic maintenance (conditioning with natural waxes every 12-18 months).