Rolex
Datejust 31 178383-0024— lug 16mm

The lug width of the Rolex Datejust 31 Ref. 178383-0024 is 16mm. This dimension refers to the internal distance between the two metal pins that attach the strap to the case. To verify it, remove the current strap and measure the space between the lugs: all replacement straps must have an internal width of exactly 16mm to fit correctly, without play or forcing.

For the Datejust 31 in steel and yellow gold, we recommend alligator straps in cognac or tobacco colour, which enhance the luminous quality of the gold without disrupting aesthetic balance. Alternatively, vegetable-tanned calf offers a patina that evolves over time, whilst shell cordovan guarantees natural rigidity and increasing lustre. The choice depends on intended use and personal aesthetic preferences.

The process requires a dedicated spring bar tool. Observe the strap from underneath: you will notice two small metal rings positioned perpendicular to the lugs. Insert the tool tip into one of the small lateral holes, push gently upward to compress the internal spring, and slide the ring outward. Repeat for the opposite side. To install the new strap, reverse the procedure by pushing the rings into their housings until you hear a distinct click indicating secure placement.

Yes, provided the lug width is exactly 16mm and the leather thickness does not exceed 2.8mm. Quality aftermarket straps — crafted in alligator, calf or shell cordovan — fit perfectly without compromising water resistance or aesthetics. However, to preserve the watch's value, we recommend keeping the original Rolex strap in optimal condition, using it for formal occasions and rotating alternative straps for daily wear.

Longevity depends on leather quality and usage conditions. An alligator or vegetable-tanned calf strap, worn daily, maintains structural integrity for 3-4 years before replacement becomes necessary. Shell cordovan, thanks to its fibrous density, can last 5-6 years. Prolonged sun exposure, moisture and perspiration accelerate ageing. To extend strap life, store it in a cool, dry environment when not worn, avoid prolonged water immersion and occasionally apply a specialist leather protectant.