Strap for Datejust 31 Stainless Steel / Jubilee / Blue - Roman

The lug width (distance between the lugs) of the Rolex Datejust 31 278240-0018 is 16 mm. This measurement represents the distance between the spring bars that connect the strap to the watch case. It is essential to verify this dimension before purchasing an aftermarket strap, as an incorrect measurement would result in instability or prevent proper attachment. You can verify this measurement using a digital calliper by measuring the distance between the two lugs, or by consulting a professional watchmaker.

The ideal strap depends on your use case and aesthetic preferences. For classic elegance, alligator leather represents the most refined choice, developing a natural patina over time. Vegetable-tanned calf leather offers a modern appearance with dignified wear characteristics. Shell cordovan guarantees superior density and natural lustre. Rubber straps are perfect for daily sporting use. For the Datejust 31 278240-0018, we recommend choosing based on your dial: cognac or dark brown alligator for silver dials, black or dark grey for white dials. Visit our collection of 16 mm straps to discover all available options.

Changing the strap on a Rolex Datejust 31 requires specific tools: a spring bar tool and optionally a magnifying lamp. Position the watch on a soft, stable surface. Using the spring bar tool, carefully remove the spring bars from one side of the lugs, maintaining controlled pressure to avoid damaging the case. Repeat the operation from the other side. Once the old strap is removed, insert the spring bars of the new strap into the lugs, ensuring the bars click securely into position. If you are unsure about the procedure, consult a professional watchmaker to prevent damage to the case.

Any strap with a 16 mm lug width is mechanically compatible with the Rolex Datejust 31 278240-0018. However, to ensure aesthetic authenticity and longevity, we recommend straps crafted by specialised artisans such as Casati Milano. Our straps in alligator, calf, shell cordovan and rubber are specifically designed for luxury watches like your Datejust 31. We offer a complete collection of 16 mm straps verified for mechanical compatibility and visual harmony with the model. A quality strap transforms your daily experience with your watch, ensuring comfort, reliability and lasting beauty.

The lifespan of a leather strap depends on the material, frequency of use and environmental conditions. An alligator strap tanned with vegetable tanning, if properly maintained, can last 3–5 years in daily use, developing a fascinating patina over time. Shell cordovan, being denser, can reach 5–7 years. Calf leather straps have a similar lifespan to alligator, approximately 3–5 years. Breakage is only inevitable if subjected to mechanical stress, excessive moisture or neglect in maintenance. All Casati Milano straps include an 18-month warranty against manufacturing defects. To maximise strap longevity, store the strap in a dry place when not worn, avoid prolonged contact with water and occasionally apply a specific balm for fine leather.