Rolex
Datejust 31 178341-0034— lug 16mm

The lug width of the Rolex Datejust 31 178341-0034 is 16 millimetres. This technical specification defines the distance between the two lugs on the case and determines the compatibility of any strap or bracelet. To verify, position a digital calliper perpendicular to the lugs: precise measurement is essential to avoid poor strap fit.

For this two-tone watch with mother-of-pearl dial, alligator leather represents the optimal choice: its regular grain and suppleness enhance the case's elegance. Valid alternatives include vegetable-tanned calf (which develops patina over time) and shell cordovan for those preferring durability and moisture resistance. Recommended colours are dark brown, black, and burgundy.

The strap is removed by working the lug pins (metal rods connecting the strap to the case). Using a spring bar tool, gently press the internal spring to release the pin from one side, remove the old strap, then insert the new pin into the opposite lug and release the spring. A straightforward operation, though professional installation at an authorised Rolex dealer or experienced craftsman is recommended to avoid damage.

Yes, provided it respects the 16mm lug width specification. Artisanal straps manufactured to this specification fit perfectly into the original case. Quality depends on the maker: certified leathers, double stitching, refined finishes, and stainless steel pins ensure durability and aesthetic compatibility. Specialist brands such as Casati Milano offer construction standards that rival Rolex factory straps.

A high-quality leather strap (alligator, shell cordovan, vegetable-tanned calf) typically lasts between 3 to 5 years with moderate daily use. Factors affecting longevity include: frequency of wear, sun exposure, water and moisture contact, and preventative care (periodic cleaning, conditioning). An alligator strap, if protected from extremes, may last up to 7 years. Casati Milano's warranty covers manufacturing defects for 18 months from receipt.