Strap for Datejust 31 Stainless Steel Fluted / Oyster / Grey - Diamonds

The lug width (or lug-to-lug distance) of the Rolex Datejust 31 reference 278274-0007 is precisely 16 millimetres. This dimension represents the space between the lugs (the two metal extensions protruding from the case) where the strap or bracelet is attached. To verify this measurement, use a digital calliper to measure the distance between the two attachment points: it must be exactly 16mm. Any strap incompatible with this specification will not fit correctly into the case and poses a risk of damage to the lugs.

For a bicolour piece such as the 278274-0007, alligator leather remains the most stylistically coherent choice: the natural texture of the scales creates elegant visual contrast against the geometric metal surfaces, whilst the soft feel of quality leather balances the weight of the steel and white gold case. A technical alternative is chrome-tanned calf leather, which offers superior daily durability and develops a natural patina over time. A silk or linen NATO strap paired with a stainless steel deployant clasp represents a sportier reinterpretation without compromising the watch's formal character.

Changing the strap requires a spring bar tool. Locate the small holes on the inner sides of the case lugs: insert the flat tip of the tool into these holes to compress the spring bars and release the current strap. Align the holes of the new strap with the lugs and push firmly until you hear a click, indicating the bars are fully engaged. If you do not possess the correct tool, contact a qualified watchmaker to avoid scratching the case. Casati Milano offers this service at their Milan atelier by appointment.

Yes, any aftermarket strap with a 16mm lug width is fully compatible. Compatibility depends on precise measurement of the lug width, not on the watch brand. However, the quality of the strap significantly affects your wearing experience: poor-quality leather or careless finishing compromises the dignity of a Rolex. For this reason, we recommend artisanal straps with documented material sourcing and production guarantees, such as those crafted by Casati Milano in their certified workshop.

Durability varies according to the material and frequency of wear. High-quality alligator leather, with proper maintenance (regular cleaning, thorough drying after accidental water exposure), maintains structural integrity for 3–4 years under daily wear. Chrome-tanned calf leather typically performs better, lasting 5–6 years. Critical factors include ambient humidity, perspiration, direct sun exposure, and tanning quality. Cotton and rubber straps have different wear cycles, generally longer-lasting. Casati Milano provides an 18-month warranty against manufacturing defects on all bespoke straps.