Rolex
Day-Date 36 118346-0050— lug 20mm

The lug width of the Rolex Day-Date 36 118346-0050 is precisely 20 millimetres. This is not a universal standard, but the width calculated by Rolex to maintain ideal volumetric proportions between the case and the lugs. Measured between the inner edge of one lug and the other, perpendicular to the case shoulders, it must be precise to one tenth of a millimetre.

Nile alligator and shell cordovan are the primary choices for platinum. Alligator offers a geometric grain that creates a sophisticated visual conversation with the case lines; shell cordovan develops an amber patina over time that communicates longevity and conscious use. Vegetable-tanned calf leather is ideal for those seeking construction durability in humid climates. Rubber remains out of scale: platinum demands a material that is tangibly substantial to the touch.

Insert a flat, blunted tool—a spring bar or dedicated instrument—into the small slot between the lug and the retaining spring, located at the sides of the case. Press gently outward to lift the spring: you will feel a small 'click.' Remove the old strap and insert the new one, aligning the lug width with the lug opening, then press until you feel the second 'click' confirming secure locking. If the strap is 20mm but difficult to insert, the issue is not the width but construction tolerance: contact the manufacturer.

Yes, provided the lug width is strictly 20 millimetres and the construction is of comparable quality. Handcrafted alligator and shell cordovan straps are compatible; however, lower-tier aftermarket straps often exhibit micro-slippage in the lugs due to imprecise tolerances, accelerating case wear. Choose manufacturers who guarantee ±0.1mm tolerances and certified materials.

A natural leather strap on a Day-Date typically lasts 3–5 years with daily wear, up to 7–8 years if worn 2–3 times per week. Longevity depends on tanning quality (vegetable tanning ages more nobly but requires care), sun and moisture exposure, and cleaning frequency. Shell cordovan tends to last longer than alligator due to superior fibre density. The buckle or deployante will generally not wear if made of noble metal.