Rolex
Datejust 31 178384-0040— lug 16mm

The Rolex Datejust 31 with reference 178384-0040 features a 16-millimetre lug width. This measurement is standard for 31mm ladies' Datejust models and is essential for strap compatibility. Measure the internal space between the horizontal lugs with a digital calliper to verify precision.

For the 178384-0040 with Mother-of-Pearl dial and white gold-stainless steel case, we recommend vegetable-tanned alligator (cognac, dark brown or black tones), vegetable-tanned calf (bordeaux, mink) or shell cordovan for those who appreciate artisanal exclusivity. Each material respects the aesthetic balance of the case and develops character over time.

Use a spring bar removal tool: position the flat screwdriver in the access hole between the lug and the spring bar, gently lift the bar, then remove the existing strap. Insert the new strap by aligning the spring bars and press until they click into place. Proceed with caution to avoid damaging the white gold case.

Yes, any strap with a 16-millimetre lug width is compatible with the 178384-0040. Always verify the width before purchase. Bespoke artisanal straps crafted by specialist makers, such as those from Milano Straps, guarantee maximum compatibility and superior construction quality compared to mass-produced alternatives.

A high-quality leather strap (alligator, calf, shell cordovan) with vegetable tanning typically lasts 3–5 years in daily use, developing characteristic patina and increasing aesthetic value. Durability depends on intensity of wear, humidity exposure and maintenance. A premium aftermarket strap, such as one from Casati Milano, maintains structural integrity and patina for 7–10 years.