Technical Archive

Rolex
Datejust 31 278381rbr-0025— lug 16mm

Rolex Datejust 31 278381rbr-0025: 16mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Datejust 31 Stainless Steel/ Rose Gold / Diamond / MOP / Oyster

Artisanal Note

"This model requires a precise 16mm lug width to preserve the original sartorial balance."

Technical Specifications

Rolex 278381rbr-0025
Lug Width
16 mm

The essential strap measurement.

Browse 16mm straps →
Reference

278381rbr-0025

Movement

Rolex caliber 2236 Hours, Minutes, Seconds | Date | Chronometer

The Heritage

The Rolex Datejust 31 ref. 278381rbr-0025 combines a 31mm stainless steel and Everose gold case with a natural mother-of-pearl dial and diamond-set bezel. It houses the Rolex calibre 2236 with Syloxi silicon components and Microstella adjustment, offering COSC chronometer certification with ±2 seconds daily precision and approximately 55 hours of power reserve. The case features a screw-down Oyster caseback and sapphire crystal with anti-reflective coating, waterproof to 100 metres. The lug width is 16mm.

FAQ

What is the lug width of the Rolex Datejust 31 278381rbr-0025?

The lug width of the Rolex Datejust 31 ref. 278381rbr-0025 is 16mm. This measurement is specific to the 31mm case size and differs from the Datejust 36 and 41 variants, which both feature 20mm lugs. When sourcing a replacement strap, it is essential to select a model measuring 16mm at the attachment point between the lugs.

What is the best strap for the Rolex Datejust 31 278381rbr-0025?

For the Datejust 31 ref. 278381rbr-0025, with its Everose and stainless steel case and mother-of-pearl dial, the most suitable options are alligator leather in antique rose or cream tones to complement the warm hues of the case, or vegetable-tanned calfskin in burgundy or slate grey for a more tailored aesthetic. Shell cordovan is recommended for those seeking a noble material that develops a rich patina over time. A deployant clasp is advisable to minimise daily wear on the leather strap.

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

To replace the strap on a Rolex Datejust 31, the spring bars securing the bracelet or strap to the case lugs must be removed using a dedicated spring bar tool. The forked tip of the tool is inserted into the slot between the lug and the bracelet end piece to compress and release the spring bar. It is advisable to work on a soft surface to protect the case and crystal. If in doubt, the operation can be carried out by a watchmaker or at a specialist atelier.

Are there aftermarket straps compatible with the Rolex Datejust 31 278381rbr-0025?

Yes, a wide range of aftermarket straps with a 16mm lug width are compatible with the Rolex Datejust 31 ref. 278381rbr-0025. Milano Straps offers a curated selection of handcrafted leather, rubber, and other straps fitted with standard spring bars that attach directly to the original Rolex lugs without any modification to the case. Compatibility is ensured by the 16mm lug width specification.

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 quality alligator strap worn daily typically lasts between 2 and 4 years before showing significant wear at the keeper and buckle holes. Vegetable-tanned calfskin develops an attractive patina but is more susceptible to deterioration from water and perspiration. Shell cordovan, being denser and more compact, generally offers greater longevity. The use of a deployant clasp considerably extends strap life by reducing the mechanical stress of daily opening and closing.

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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The atelier's website: casatimilano.com