Rolex
Datejust 31 278245-0015— lug 16mm

The lug width (ansa width) of the Rolex Datejust 31 278245-0015 is 16 millimetres. This measurement refers to the internal distance between the two case lug horns and is essential for determining compatibility with any aftermarket strap. A 16 mm lug width is proportioned to the compact 31 mm case diameter and ensures correct visual balance between the case and strap.

For a Datejust 31 278245-0015 in Everose™, solid-colour leather straps – particularly calf or alligator – represent the most elegant choice. Calf leather offers a smooth, supple texture that enhances the warmth of rose gold, whilst alligator provides pronounced visual texture and refined tactile quality. For those seeking versatility, fine rubber straps or cotton NATO straps are practical alternatives that do not compromise the model's elegance. Avoid oversized straps or heavily textured materials that would create visual imbalance with the case's compact proportions.

Strap replacement is accomplished using a spring bar remover tool (a fork-shaped instrument) to extract the elastic bars (spring bars) that secure the strap to the lugs. Position the tool in the small groove beneath each lug, apply gentle upward pressure, and the strap will release. Once removed, align the new strap's holes with the lugs and reinsert the spring bars until you hear or feel the click of engagement. This operation takes just over one minute and requires no particular technical skill; however, if you do not possess the correct tools, consulting a professional watchmaker is advised.

Any artisanal strap with a 16 mm lug width is compatible with the Datejust 31 278245-0015, provided it is crafted from quality materials (full-grain leather, alligator, shell cordovan) and constructed to reliable standards. Milano Straps offers a specialised collection of 16 mm straps in various finishes and colours, custom-made at the Casati Milano atelier. Compatibility is not limited to official Rolex leather alone; in fact, many Datejust 31 owners prefer custom straps to personalise their watch whilst maintaining original build quality.

The durability of a leather strap depends on leather quality, frequency of use, and maintenance. A high-quality calf leather strap, worn daily with proper care (protection from excessive moisture, periodic cleaning, conditioning every 6-12 months), maintains structural and aesthetic integrity for 3-5 years. A shell cordovan or alligator strap, owing to greater fibre density, can last 5-7 years or longer. Natural strap wear is part of its charm: the patina that develops over time tells the story of your watch's use. Casati Milano provides an 18-month warranty on manufacturing defects and can craft replacement straps following the original specification throughout the years.