Rolex · Datejust 36

Strap for Datejust 36 Stainless Steel / Fluted / Aubergine Roman-Diamonds / Jubilee

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter36 mm
Reference126234-0021
FamilyDatejust 36
MovementRolex caliber 3235 Hours, Minutes, Seconds | Date | Chronometer
CaseWhite Gold, Stainless Steel

Recommended spring bar

Modern Rolex spring bars 20mm — 1.5mm diameter

Technical match for lug width and diameter · lug 20 mm · Ø 1.5 mm · closed lugs

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Straps for the Datejust 36 126234-0021

Selected for the 20 mm lug width · workshop selection

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The Datejust 36 126234-0021, seen from the bench

The Rolex Datejust 36 126234-0021 features a two-tone case combining white gold and stainless steel, embodying the harmonious 36mm proportion that defined the gentleman's watch standard. It houses the Rolex 3235 caliber, a COSC-certified chronometer movement with screw-down escapement, automatic winding, and over three days of power reserve. The 20mm lug width ensures compatibility with aftermarket straps and represents the proportional balance between the 36mm case and average male wrist.

Frequently asked questions

What is the lug width of the Rolex Datejust 36 126234-0021?

The lug width is 20mm. This measurement represents the width of the strap from the attachment point at the case lug to the opposite side. It is essential to verify this measurement before purchasing an aftermarket strap, as an incorrect width would result in lateral play or mounting difficulties. To measure accurately, position a calliper at the lug shoulder and extend to the opposite lug.

What is the best strap for the two-tone Rolex Datejust 36 126234-0021?

For the Datejust 36 in white gold and stainless steel, alligator leather represents the most refined choice. We recommend medium grain texture in dark brown or black, which enhances the case without visual competition. Alternatively, superior-quality calf leather worked with vegetable tanning offers a patina that evolves over time. For a sportier interpretation, dark tannin calf with white stitching balances the case's visual depth.

How do you change the strap on a Rolex Datejust 36 126234-0021?

The procedure requires a specific tool: a spring bar removal tool with dual ends. Carefully remove the original strap by extracting the spring bars from the case lugs. Insert the new strap by aligning the spring bars with the corresponding seats and press until you hear a click. We recommend performing this operation on a soft surface (cloth) to prevent scratches. If you lack experience, entrust the task to a professional watchmaker.

Can an aftermarket 20mm strap be mounted on a Rolex Datejust 36 126234-0021?

Yes, provided the strap is certified for 20mm lug width. Artisanal straps produced by Casati Milano and distributed by milanostraps.it are fully compatible. Verify that the strap's lugs are of identical width (20mm) and that the attachment spring bars are Rolex-standard. A high-quality artisanal strap significantly elevates the overall aesthetic of the watch compared to mass-produced alternatives.

How long does a leather strap last on a Rolex Datejust 36 126234-0021?

A high-quality natural leather strap (alligator, tannin calf, shell cordovan) typically lasts 3–5 years with moderate daily wear, extending to 7–10 years with occasional use and proper maintenance. Longevity depends on sun exposure, perspiration, humidity, and frequency of wear. Regular maintenance (cleaning and conditioning with specialist products) significantly extends useful life. Casati Milano straps, crafted with premium leather and artisanal construction, offer superior durability compared to industrially-produced alternatives.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only