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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel/ Rose Gold / Diamond / Chocolate - Roman / 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
Reference278381rbr-0005
FamilyDatejust 31
MovementRolex caliber 2236 hours, minutes, seconds | date | chronometer
Year2018
CaseRose Gold, Stainless Steel

Spring bar

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Straps for the Datejust 31 278381rbr-0005

Selected for the 16 mm lug width

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The Datejust 31 278381rbr-0005, seen from the bench

The Rolex Datejust 31 reference 278381rbr-0005 is a mid-size sports-elegant watch combining 18-carat Everose gold and Oystersteel in 904L alloy. The 31mm Oyster case features a diamond-set bezel, chocolate dial with Roman numerals, and Cyclops date window on sapphire crystal. The Rolex caliber 2236 movement includes a Syloxi silicon balance wheel and patented Syloxi hairspring, certified Superlative Chronometer with ±2 seconds/day precision. Water-resistant to 100 metres. The 16mm lug width is specific to the Datejust 31 Oyster configuration and requires precise fitting for proper functionality and aesthetics.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 278381rbr-0005?

The Rolex Datejust 31 278381rbr-0005 has a lug width of 16mm. This measurement is specific to the 31mm Oyster case and is not shared with the 28mm variant (13mm) or the 36mm variant (19-20mm). Any aftermarket strap must feature a precise 16mm attachment width.

What is the best strap for the Rolex Datejust 31 278381rbr-0005?

For the Datejust 31 in Rolesor Everose, alligator leather in burgundy or cognac tones is the most coherent choice for the elegant bi-colour case. Vegetable-tanned calfskin suits those who appreciate a developing patina over time, while shell cordovan offers natural resistance and lustre. All straps must feature a precisely cut 16mm attachment.

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

Replacing the strap on a Datejust 31 requires a fine-tipped spring bar tool (1mm) to release the spring bars from the lugs. Work on a soft surface to protect the case from scratches. If in doubt, it is advisable to consult a professional watchmaker or Casati Milano atelier for a safe and damage-free installation.

Are there aftermarket straps compatible with the Rolex Datejust 31 278381rbr-0005?

Yes. The Datejust 31 with 16mm lugs is fully compatible with bespoke aftermarket straps. Milano Straps offers a curated selection of 16mm straps in alligator, calfskin, shell cordovan and rubber, crafted to the same dimensional tolerances as original Rolex straps. Compatibility refers to the attachment width; length can be customised at the time of order.

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

Longevity depends on the material and daily wear conditions. A quality alligator strap, with proper care, typically lasts 2 to 4 years. Vegetable-tanned calfskin has a similar lifespan but develops a distinctive patina over time. Shell cordovan is the most durable of the premium leathers and can exceed 4 years of use. Milano Straps provides an 18-month warranty against manufacturing defects on all handcrafted 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