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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel Diamond / Jubilee / Grey

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-0020
FamilyDatejust 31
MovementRolex caliber 2236 hours, minutes, seconds | date | chronometer
Year2020
CaseWhite Gold, Stainless Steel

Spring bar

Spring bars for Rolex

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Straps for the Datejust 31 278384rbr-0020

Selected for the 16 mm lug width

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The Datejust 31 278384rbr-0020, seen from the bench

The Rolex Datejust 31 reference 278384rbr-0020 features a 31mm case combining 18-karat white gold and Oystersteel, with a diamond-set bezel. The case houses the Rolex Caliber 2236, a manufacture movement with silicon Syloxi hairspring, offering chronometer-certified precision and automatic winding. Water-resistant to 100 metres with screw-down Oyster caseback and Twinlock crown. Lug width is 16mm. This timepiece belongs to the Datejust collection, introduced in 1945 as the first waterproof automatic wristwatch with date display at 3 o'clock.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 278384rbr-0020?

The lug width of the Rolex Datejust 31 reference 278384rbr-0020 is 16mm. This measurement is taken internally between the two lugs using a millimetre calliper. Using a strap with the exact 16mm width is essential to ensure a precise fit and a clean aesthetic result.

What is the best strap for the Rolex Datejust 31 278384rbr-0020?

For the Datejust 31 in white gold with a diamond-set bezel, an authentic alligator strap with vegetable tanning is the most coherent choice, complementing the jewellery-oriented character of the watch. Alternatively, shell cordovan develops a distinctive patina over time and suits daily wear particularly well. Both options are available bespoke through the Casati Milano atelier or in the 16mm strap collection on milanostraps.it.

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

To replace the strap on the Rolex Datejust 31, the 16mm spring bars securing the strap to the lugs must be removed. This requires a forked springbar tool. The operation should be carried out on a soft surface to avoid scratching the case, and the spring bars should be confirmed fully seated before wearing the watch. If in doubt, it is advisable to entrust the operation to a watchmaker or the atelier.

Are there aftermarket straps compatible with the Rolex Datejust 31 278384rbr-0020?

Yes, a wide range of aftermarket straps is compatible with the Rolex Datejust 31, provided they conform to the 16mm lug width and feature a curved end suited to the Oyster lug profile. Milano Straps offers a selection of handcrafted leather, cordovan and other material straps, available bespoke or ready to ship, with buckle or deployant clasp options in white gold for full aesthetic consistency.

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

The lifespan of a leather strap depends on the material, frequency of use and care. A genuine alligator strap with vegetable tanning, worn regularly but not daily and stored away from moisture and perspiration, can last between 3 and 6 years in excellent condition. Shell cordovan, owing to the density of its subcutaneous fibres, tends to develop a patina over time rather than deteriorating. Casati Milano provides an 18-month warranty against manufacturing defects on all its straps.

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