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Rolex · Datejust 31

Strap for Datejust 31 Yellow Gold / Fluted / Olive - Diamond / Oyster

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
Reference278278-0018
FamilyDatejust 31
MovementRolex caliber 2236 hours, minutes, seconds | date | chronometer
Year2018
CaseYellow Gold

Spring bar

Spring bars for Rolex

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Straps for the Datejust 31 278278-0018

Selected for the 16 mm lug width

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The Datejust 31 278278-0018, seen from the bench

The Datejust 31 in 18-karat yellow gold (ref. 278278-0018) is a mid-size automatic chronometer with instantaneous date change, featuring the in-house Calibre 2236 movement. The 31mm yellow gold case is water-resistant to 100 meters, equipped with a screwed-down crown and caseback, and finished with alternating satin and polished surfaces. The movement includes a Syloxi silicon oscillator, Chromagy balance, approximately 55 hours of power reserve, and COSC Chronometer certification (−4/+6 seconds per day). The date is viewed through a 2.5x Cyclops magnifying lens on the sapphire crystal. Lug width is 16mm.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 reference 278278-0018?

The Rolex Datejust 31 reference 278278-0018 has a lug width of 16mm. This is a non-standard size compared to the Datejust 36 or 41 models, so it is important to confirm this measurement before purchasing any aftermarket strap. To measure accurately, use a digital calliper positioned inside the lugs of the case.

What is the best strap for the Rolex Datejust 31 278278-0018 in yellow gold?

For an 18-carat yellow gold case such as that of the Datejust 31 278278-0018, a vegetable-tanned alligator strap in tobacco, cognac or dark brown tones offers the most balanced pairing. The belly grain of alligator leather engages visually with the texture of the gold. Alternatively, a matte black box-calf strap provides a refined modern contrast, whilst shell cordovan combines durability with a natural lustre.

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

To replace the strap on a Rolex Datejust 31, a spring bar tool with a fine fork tip is required to avoid scratching the gold case. The spring bars connecting the strap to the lugs have specific dimensions for the 16mm lug width: always verify compatibility before attempting the swap. It is advisable to work on a soft surface to protect both the case and the crystal.

Are there aftermarket straps compatible with the Rolex Datejust 31 278278-0018?

Yes, high-quality aftermarket straps compatible with the Datejust 31 278278-0018 are available, provided they feature a 16mm lug width and shaped ends to follow the curvature of the Rolex lugs. Milanostraps.it offers a selection of 16mm straps in various materials — alligator, calf leather, shell cordovan and rubber — crafted to a standard befitting an 18-carat yellow gold case.

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

The longevity of a leather strap on a Rolex Datejust 31 depends on the quality of the tanning process, daily usage and care. A high-grade vegetable-tanned alligator strap, worn regularly but kept away from damp environments, typically lasts between two and four years before replacement is needed. Vegetable-tanned leather develops a patina over time but is more sensitive to moisture than chrome-tanned alternatives. Storing the strap away from direct heat and humidity significantly extends the leather's service life.

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