Rolex
Day-Date 36 118348-0027— lug 20mm

The lug width of the Day-Date 36 118348-0027 is precisely 20 millimetres. This measurement represents the distance between the two lugs on the case where the strap attaches. A 20mm strap is the only compatible size for this model; widths of 19mm or 21mm will not fit correctly. Always verify this measurement before purchasing an aftermarket strap.

The optimal strap choice depends on intended use and personal preference. For formal elegance, cognac alligator or dark calf leather with vegetable tanning are traditional choices that create tonal harmony with the yellow gold case. For supreme material quality, shell cordovan offers natural patina and superior aging characteristics. Every strap should feature a yellow gold deployante clasp for stylistic coherence. We recommend evaluating options at Casati Milano atelier, where you can inspect leather quality and arrange bespoke customisations.

Strap replacement requires a spring bar removal tool to disengage the spring bars from the lugs. Place the watch on a soft surface to prevent scratching. Insert the removal tool into the lateral slot on the lug, lift the spring bar, and insert the new strap whilst ensuring it clicks securely into place. Never force the lugs: resistance typically indicates incorrect sizing. For the 118348-0027, the strap must measure precisely 20mm.

Yes, provided the lug width is correct (20mm) and the strap's construction quality is comparable to factory standards. Aftermarket straps from specialist craftsmen (such as Casati Milano) frequently offer superior patina development and material choice compared to factory options. The principal risk is purchasing undersized straps or those with poorly calibrated lugs: in such instances, changing becomes problematic and the strap may slip. Avoid low-cost online straps with vague lug width specifications.

Lifespan depends on material and usage frequency. Quality alligator with vegetable tanning typically lasts 3–5 years under daily wear, with aesthetically positive ageing (patina development). Shell cordovan, if properly maintained, extends to 5–7 years. Calf leather is less durable, lasting 2–3 years. Exposure to perspiration, moisture, and UV radiation accelerates degradation. Casati Milano offers 18-month warranty on manufacturing defects; beyond this period, wear is natural. We recommend rotating multiple straps to extend overall lifespan.