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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel Diamond / Oyster / Silver

Takes 16 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

16mm
16 mm strapsAll Rolex
Lug width16 mm
Case diameter31 mm
Reference278384rbr-0015
FamilyDatejust 31
MovementRolex caliber 2236 hours, minutes, seconds | date | chronometer
Year2020
CaseWhite Gold, Stainless Steel

Spring bar

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Straps for the Datejust 31 278384rbr-0015

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The Datejust 31 278384rbr-0015, seen from the bench

The Datejust 31 represents the feminine version of the Rolex Datejust collection, characterized by a 31mm diameter case. It is equipped with the automatic Caliber 2236 with hour, minute, second and date functions, certified as a chronometer. The lugs measure 16mm in width.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 reference 278384rbr-0015?

The lug width of the Rolex Datejust 31 reference 278384rbr-0015 is 16mm. This is the standard <a href="/pages/termine-glossario/misura-ansa">lug width</a> for all 31mm Datejust models, whether ladies' or compact versions. Measurement is taken across the flat surface between the lugs where the strap attaches to the case.

What is the best strap material for the Rolex Datejust 31 278384rbr-0015?

For the two-tone yellow gold and stainless steel case of the 278384rbr-0015, we recommend three options: (1) <a href="/pages/termine-glossario/alligatore">alligator</a> leather in black or chocolate brown, which emphasizes the case's sobriety; (2) calf leather with medium grain texture, an elegant and breathable alternative; (3) vegetable-tanned rubber for intensive daily wear. NATO straps are discouraged—they appear oversized on a 31mm case. The buckle should match the case metal: stainless steel or white gold.

How do you change the strap on a Rolex Datejust 31?

Strap replacement requires a specialized spring bar tool to extract the elastic pins that secure the strap to the case lugs. We do not recommend DIY replacement on a Rolex: the risk of scratching the case is substantial. Professional replacement at an official Rolex service centre or Casati Milano takes minutes and guarantees precision without risk of damage.

What aftermarket strap is compatible with the Datejust 31 reference 278384rbr-0015?

Any strap with a 16mm <a href="/pages/termine-glossario/misura-ansa">lug width</a> is mechanically compatible. Milano Straps offers a specialized collection of <a href="https://milanostraps.it/collections/cinturini-orologi-per-misura-ansa-16mm">16mm straps</a> in Italian leather, alligator, and vegetable-tanned rubber. Material and finish selection must respect the aesthetic balance of the two-tone case: avoid straps thicker than 4mm, which distorts the model's proportions.

How long does a leather strap last on a Rolex Datejust 31?

Leather strap durability depends on wear intensity and material quality. A premium <a href="/pages/termine-glossario/alligatore">alligator</a> strap, worn 4–5 days weekly, maintains structural and aesthetic integrity for 4–6 years. Calf with <a href="/pages/termine-glossario/concia-vegetale">vegetable tanning</a> typically lasts 3–5 years. Casati Milano's 18-month warranty covers production defects; beyond this period, wear is considered natural ageing. We recommend rotating multiple straps to extend the life of each.

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