Strap for Datejust 31 Stainless Steel Domed Diamond / Jubilee / Black

The lug width of the Rolex Datejust 31 reference 178344-0044 is 16 millimetres. This measurement is specific to the 31mm case and must be measured precisely using a digital calliper positioned perpendicularly to the lugs. Any error in measurement, even half a millimetre, would result in the inability to mount the strap correctly.

The best option depends on usage and personal preference. For formal contexts, alligator in chocolate brown or black provides timeless elegance. For everyday versatility, smooth calf leather in neutral tones (black, brown, cognac) represents the most balanced choice. Vegetable tanning offers a contemporary option that ages with character over time, ideal for those who appreciate material evolution.

To change the strap, you must use a specific tool called a spring bar remover, which allows you to compress and deactivate the spring-loaded pins (spring bars) that attach the strap to the case lugs. If you lack experience, we recommend consulting a qualified watchmaker or specialised atelier such as Casati Milano, where the change is executed with precision and respect for the case.

Yes, provided the strap is constructed with a 16-millimetre lug width. Bespoke leather straps made by specialised ateliers guarantee perfect compatibility and often superior build quality compared to standard aftermarket solutions. It is important to verify that the strap has been designed for this specific lug width.

Durability depends on the material and maintenance. A high-quality alligator strap, if properly cared for, can remain intact for 3 to 5 years of daily wear. Calf leather offers similar longevity, whilst vegetable-tanned leather tends to patina over time but remains functional for years. Maintenance consists of avoiding prolonged exposure to moisture, sweat and direct sunlight.