Strap for Datejust 31 Stainless Steel Diamond / Oyster / Purple - Roman

The lug width of the Rolex Datejust 31 178384-0027. is 16 millimetres. This parameter measures the distance between the lugs that anchor the strap to the case and is fundamental for ensuring compatibility. You can verify it by removing the original Rolex strap and measuring the width of the lug base that emerges from the case. A strap with a different lug width (14mm, 18mm) will not fit correctly, creating visual gaps and safety concerns during wear.

The best strap depends on intended use and personal aesthetic preferences. For formal contexts, black alligator offers uncompromised elegance; dark brown shell cordovan represents the most versatile solution for those who wish to transition from formal business environments to casual settings without changing straps. Vegetable-tanned structured calf is recommended for those who value sustainability without sacrificing quality. For water sports enthusiasts, natural rubber with grain texture maintains elegance whilst offering moisture resistance. The two-tone gold-steel case of the 178384-0027. requires a strap that dialogues with both tones without dominating the overall colour composition.

Changing the strap requires a specific tool (spring bar removal tool) to extract the pins that secure the strap to the case. Position the tool under the spring bar pin, apply gentle upward pressure to compress the spring, then extract the pin. Repeat the operation on both sides. Install the new 16mm strap by inserting the pin into the lug cavity and pushing until the spring engages. It is advisable to have this operation performed by an expert to avoid damage to the case. Casati Milano offers fitting services by appointment at the Milan atelier.

Any strap equipped with spring bar attachments and a 16-millimetre lug width is compatible with the 178384-0027. It is essential to verify this specification before purchase. Straps are available in alligator, calf, shell cordovan and natural rubber at milanostraps.it in the section dedicated to 16mm straps. Bespoke straps produced by Casati Milano can be personalised in leather, colour and style by appointment at the atelier, ensuring total aesthetic coherence with your Rolex's two-tone gold-steel case.

The lifespan of a leather strap depends on frequency of wear, environmental conditions and leather type. High-quality alligator or shell cordovan, worn daily, maintains structural and aesthetic integrity for 3-5 years before requiring replacement due to natural wear. Vegetable-tanned structured calf develops a patina that evolves visually over time, typically lasting 2-4 years. Natural rubber lasts longer than alligator, even 6-7 years, but loses elasticity with sun exposure. Bespoke straps from Casati Milano are covered by an 18-month warranty against manufacturing defects, regardless of leather type.