Rolex
Datejust 36 116243-0004— lug 20mm

The lug width is 20 millimetres. This dimension is inscribed in the design of the 36 mm case and is determinant for any compatible aftermarket strap. Measurement is taken from the centre of the upper lug hole to the centre of the lower lug hole at the end of the lug. Rolex produces no alternatives, because the 20 mm proportion represents the aesthetic compromise between case mass and wrist balance.

Alligator is the formal choice par excellence: fine grain pairs with gold lustre without excessive visual texture. Vegetable-tanned calf leather is the alternative for those desiring conscious hand-feel and evolving patina. Shell cordovan offers compactness and lustre without visible pores. NATO canvas and FKM rubber are technical choices for daily wear and humid environments. Consultation in the atelier, with the case present, eliminates chromatic uncertainty.

The strap is replaced using a spring bar tool: insert the flat tip into the small lateral hole of the lug, gently compress the internal spring, slide the pin outward. Repeat for both axes. Reverse the process to install the new 20 mm strap, ensuring the pins are fully inserted and the return spring clicks into place. If you lack manual competence, consult a certified watchmaker: the job requires two minutes, but an errant move damages the lugs.

Yes, any strap with a 20 millimetre lug width installs in the lugs of the 116243-0004 without modification. Mechanical tolerances are standardised (±0.5 mm), ensuring secure fit and visual proportion faithful to the original. Milanese artisan straps are constructed to certified Rolex specifications, with tempered steel pins and adjustable passants. The quality of leather, texture and colour determines how the strap visually communicates with the champagne sunburst dial.

A quality alligator or well-tanned calf strap, worn daily, shows visible wear after 3–4 years: patina deepens, edges round, micro-scratches become part of the narrative. With regular maintenance (conditioning with specific creams 2–3 times yearly), functional longevity reaches 5–7 years. Shell cordovan resists longer (7–10 years) owing to fibre compactness. NATO canvas lasts 4–5 years before weave begins to yield. FKM rubber may exceed 10 years if not exposed to prolonged direct sunlight. Deterioration is not defect: it is how leather tells time on the wrist.