Rolex
Datejust 31 178271-0047— lug 16mm

The Rolex Datejust 31 reference 178271-0047 features a lug width of 16 millimetres. This dimension is specific to the ladies' Datejust 31 collection and is determined by the geometry of the Oyster hinges and the case structure. Straps with 18mm or 20mm lug width cannot be mounted, as the lugs are precisely milled to accommodate 16mm spring bars. To verify the measurement accurately, use a digital calliper positioned orthogonally between the two lugs at their midpoint.

For the Datejust 31 178271-0047, we recommend high-grade alligator with fine or medium grain first, which creates an elegant contrast with the mother-of-pearl dial and the case's two-tone finish. Alternatively, vegetable-tanned calf leather represents a refined choice. For daily wear, a black rubber strap with quilted pattern is practical and contemporary. A NATO in black, navy blue or grey remains versatile for informal contexts, although less appropriate to the model's luxury identity.

To change the strap, you must use a spring bar tool with two flat ends. Gently position the tool's end under the hinge (spring bar) to compress the internal spring, freeing the lug from its seat. Repeat the operation on both sides. Once the old strap is removed, insert the new one by aligning the spring bars with the lugs. Ensure the spring bars click firmly into their seats. If you lack expertise, we recommend having the operation performed at Casati Milano or an authorised service centre to avoid damage.

Yes, any strap with a 16mm lug width is compatible with the Datejust 31 178271-0047. However, construction quality is crucial: low-quality straps can cause premature wear to the hinges and present risks of accidental detachment. We recommend selecting certified artisanal straps such as those offered by Milano Straps, crafted with premium leathers and precise geometric stitching. Visit the collection of compatible 16mm straps to discover available options.

The lifespan of a leather strap depends on construction quality and usage patterns. An alligator or vegetable-tanned calf strap, properly maintained, can last 3–5 years with daily wear before requiring replacement. The leather develops a natural patina that increases aesthetic value over time. Factors that shorten lifespan include prolonged sun exposure, moisture and contact with harsh cleaners. A strap made with high-quality stainless steel deployant ensures superior retention and reduces stress on the lugs. Milano Straps provides straps with an 18-month guarantee against manufacturing defects.