Rolex
Datejust 36 116203-0187— lug 20mm

The lug width of the Rolex Datejust 36 116203-0187 is 20 millimetres. This measurement refers to the internal distance between the lugs where the strap attaches to the case. Accurate measurement is essential to ensure compatibility without vertical play or lateral stress on the case.

Recommended materials include: alligator for formal occasions (natural grain and patina enhance the bi-metal case), vegetable-tanned calf for daily wear (robust construction and velvety patina over time), shell cordovan for purists (initial rigidity and shape memory), and leather NATO in 3-ply for sports contexts. Choice depends on intended use and personal aesthetic preference.

Strap replacement requires a spring bar tool or extractor. Position the watch on a stable surface, carefully engage the rear spring of each lug bar, extract the bar and repeat on the other side. Align the new strap's holes with the lugs and reinsert the bars until fully seated. If inexperienced, entrust the service to a watchmaker or Casati Milano.

A 20-millimetre strap is compatible with any watch featuring the same lug width. Rolex Submariner, GMT-Master II 36mm, certain Omega Seamaster and Seiko automatic watches use this standard. Always verify your watch's lug width before purchasing: incorrect sizing causes unwanted play and compromises aesthetics.

Strap longevity depends on material and usage. Alligator and shell cordovan, with care, easily exceed 5–7 years of daily wear. Vegetable-tanned calf lasts 3–5 years with regular maintenance (cleaning with damp cloth, avoiding prolonged immersion). 3-ply leather NATO reaches 5–10 years due to composite construction. Casati Milano's warranty covers 18 months against manufacturing defects; natural ageing and contact wear are excluded.