Rolex
Datejust 31 178343-0028— lug 16mm

The lug width of the Rolex Datejust 31 178343-0028 is 16 millimetres. This measurement is taken from the inner curve of the left lug to the inner curve of the right lug, perpendicular to the case plane. A strap with non-conforming lug width will not fit correctly into the lugs or may create dangerous mechanical play. Always purchase straps from certified retailers for this reference.

For the Datejust 31 178343-0028 in steel and yellow gold, Nile crocodile leather with full grain remains the supreme aesthetic choice – the natural grain dialogue with the dial's sunburst finish creates chromatic balance. Alternatively, European calf with vegetable tanning offers sophisticated elegance and natural ageing. Recommended colours: dark brown, cognac, cream or beige to enhance the two-tone case without competing with the dial.

Changing the strap on the Datejust 31 178343-0028 requires a spring bar removal tool. Locate the tension springs (spring bars) connecting the lugs to the case – one on each side. Insert the tool into the small hole beneath the lug, push gently to release the spring and withdraw the old strap. Insert the springs into the new strap and secure them to the case with uniform pressure until they click. If unsure, entrust the operation to Casati Milano for professional fitting.

Yes, you can fit an aftermarket strap on the Datejust 31 178343-0028 provided the lug width is precisely calibrated to 16mm. Not all 16mm straps are manufactured to identical tolerances – select reliable suppliers such as milanostraps.it that test every piece. A poorly engineered strap may damage the Oyster case lugs over time. Casati Milano constructs bespoke straps adhering to original Rolex specifications.

Leather strap lifespan depends on usage and tanning method. With vegetable tanning, quality calf or crocodile leather withstands 4–6 years of daily wear (8–10 hours per day) before replacement, often displaying beautiful natural patina. Modern tanned leather typically lasts 3–5 years. A Casati Milano strap with an 18-month manufacturing defect guarantee can be restored or replaced at the atelier. Avoid prolonged water and humidity exposure to extend useful life.