Rolex
Datejust 31 178313-0001— lug 16mm

The lug width of the Rolex Datejust 31 178313-0001 is 16 millimetres. This measurement represents the distance between the two attachment points on the case where the strap is inserted. It is essential to verify this dimension before purchasing an aftermarket strap by placing a ruler perpendicular between the lugs and measuring from the inner space of one lug to the inner space of the other.

For the Rolex Datejust 31 178313-0001, an alligator strap represents the most natural pairing, particularly in cognac dark or brown tones, which enhance the yellow gold of the two-tone case. A vegetable-tanned calf leather in dark burgundy or black maintains visual formality suited to professional environments. For those seeking versatility, authentic shell cordovan develops a lustrous patina that contrasts elegantly with the stainless steel present in the case.

To change the strap on the Datejust 31 178313-0001, you must use a spring bar tool. Position the timepiece with the strap facing downward on a soft surface to avoid scratches. Insert the spring bar tool into the appropriate slot, compressing the pin until the old strap releases. Repeat this procedure on the opposite side. Then insert the pins of the new strap, ensuring they are fully engaged on both sides of the case.

No, the 16-millimetre lug width is specific to the Rolex Datejust 31. Models such as the Datejust 36 (19mm), Submariner (20mm), or Day-Date President (20mm) require completely different lug widths. It is inadvisable to install straps of non-matching dimensions, as the case may not sit perfectly on the lugs, compromising both aesthetics and the longevity of the timepiece.

A high-quality artisanal leather strap, crafted with vegetable tanning, has an average lifespan of 3 to 5 years of daily wear. Longevity depends on climate conditions (humidity and extreme temperatures accelerate wear), frequency of use, and maintenance practices. More robust leathers such as alligator or cordovan can reach 6 to 8 years. Exposure to excessive perspiration, prolonged UV radiation, or salt water accelerates ageing. Periodic maintenance with specialised products (leather creams and natural regenerants) significantly extends the useful life.