Strap for Datejust 36 Stainless Steel / Everose / Fluted / MOP Diamond / Jubilee

The lug width of the Rolex Datejust 36 126231-0021 is 20 millimetres. This measurement indicates the precise gap between the two lugs (spring bar attachment points) on the case. Any replacement strap or bracelet must be exactly 20mm wide to fit correctly. Accurate measurement with a calliper is essential to ensure perfect compatibility with an aftermarket strap.

For the 126231-0021, we recommend cognac or dark brown alligator, as these shades harmonise with the iridescent mother-of-pearl dial and the two-tone case architecture. Alligator delivers rich patina development and geometric graining that complements the dial's light-catching properties. Alternatively, grain leather with vegetable tanning offers comfort and natural ageing characteristics. For maximum versatility, polished black alligator remains aesthetically neutral across formal and casual contexts.

Use a spring bar removal tool designed for watch lugs. Position the watch with the lug facing upward, insert the tool's tip into the spring bar channel, and gently press to release tension. Repeat on the opposite side. Align the new strap's spring bars with the lug holes and press firmly until you hear a click. To avoid case scratches, we recommend having the operation performed by an authorised Rolex dealer or by Casati Milano's atelier.

Yes, provided the strap width is precisely 20mm and the spring bars move freely. However, Rolex manufactures lugs with very tight tolerances. A bespoke strap from a quality maker ensures perfect lug-to-strap transition without friction or lateral play. Casati Milano uses original Rolex spring bars in all 20mm straps, guaranteeing seamless compatibility. Always verify that the strap seats flush against the case and exhibits no rocking motion during wear.

A quality alligator strap with vegetable tanning will last 4 to 7 years under daily wear with regular conditioning. Softer calf leather typically shows visible patina within 2-3 months and benefits from conditioning every six months. Lifespan is influenced by climate (humidity accelerates ageing), UV exposure, and frequency of wear. Casati Milano provides an 18-month manufacturing guarantee on all straps and recommends annual conditioning with appropriate leather treatments to preserve suppleness and colour integrity.