Rolex
Datejust 31 178159-0011— lug 16mm

The Rolex Datejust 31 ref. 178159-0011 has a lug width of 16mm. This measurement refers to the internal distance between the two lugs of the Oyster case in white gold and determines the exact width of the compatible strap. Using a strap of a different size would compromise alignment and fitting stability.

For an 18-carat white gold case such as that of the Datejust 31, a vegetable-tanned alligator strap represents the most coherent choice from a manufacturing standpoint. The natural scale texture and the patina that develops over time pair beautifully with the quality of the precious metal. Alternatively, fine-grain smooth calf leather ensures understated daily wear, while vulcanised rubber is recommended for sporting contexts.

To replace the strap on the Datejust 31, a dedicated springbar tool or a fine flat-head screwdriver is required. Insert the tool into the lateral lug slot and compress the springbar inward until it releases. Care must be taken to avoid scratching the white gold case; it is advisable to protect the lugs with soft adhesive tape during the procedure.

Yes. The aftermarket offers numerous options compatible with the Datejust 31 featuring a 16mm lug width. It is essential to select straps with shaped ends designed to match the internal curvature of the Oyster lugs. Milano Straps offers a curated selection of handcrafted 16mm straps in alligator, calf leather, and shell cordovan, all compatible with this reference and produced to measure by the Casati Milano atelier.

The lifespan of a leather strap depends on the material, frequency of use, and maintenance. A high-quality vegetable-tanned alligator strap, with regular use and proper care, can last between 3 and 5 years while retaining its structural and aesthetic integrity. Calf leather generally lasts 2 to 3 years, while shell cordovan is renowned for its exceptional durability. Keeping the strap away from water and excessive perspiration significantly extends the leather's service life.