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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel / Diamond / Blue - Roman / Jubilee

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-0037
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-0037

Selected for the 16 mm lug width

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The Datejust 31 278384RBR-0037, seen from the bench

The Rolex Datejust 31 ref. 278384RBR-0037 features a 31mm case combining 18k white gold and Oystersteel with a diamond-set Fluted bezel. Powered by the Caliber 2236 movement beating at 28,800 vph with a 55-hour power reserve, it achieves Superlative Chronometer certification of ±2 seconds per day. The Oyster case with screw-down caseback and Twinlock crown ensures 100-meter water resistance. Lug width is 16mm, incompatible with standard 36/41 Datejust straps.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 278384RBR-0037?

The lug width of the Rolex Datejust 31 reference 278384RBR-0037 is 16mm. This measurement refers to the internal distance between the two lugs of the case and is the specification required when selecting a compatible strap. It can be verified using a digital calliper placed between the lugs in contact with the case.

What is the best strap for the Rolex Datejust 31 278384RBR-0037?

For a white gold case with a diamond-set bezel such as the Datejust 31 278384RBR-0037, a vegetable-tanned alligator strap is the most coherent choice: the grain texture engages visually with the worked surface of the bezel and develops a patina over time. Shell cordovan is the alternative for those who prefer a compact, near-burnished surface. In both cases, a white gold buckle or a steel deployant clasp completes the pairing without metallic discontinuity.

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

To replace the strap on a Rolex Datejust 31, the spring bars connecting the bracelet to the case lugs must be removed. This requires a dedicated spring bar tool with a blunt tip, inserted into the spring bar slot, taking care to avoid scratching the white gold case. It is advisable to work on a soft surface and, if in doubt, to entrust the operation to a watchmaker or specialist atelier.

Are there aftermarket straps compatible with the Rolex Datejust 31 278384RBR-0037?

Yes, aftermarket straps compatible with the Rolex Datejust 31 are available in 16mm lug width. It is essential that the strap is cut precisely to 16mm without approximate tolerances, to avoid lateral play or fitting difficulties. Milano Straps offers a selection of 16mm straps in alligator, calf leather and cordovan, handcrafted and also available bespoke through the Casati Milano atelier.

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 exposure to perspiration and moisture. A quality alligator strap with vegetable tanning and careful finishing can last between 2 and 5 years with regular use. Shell cordovan tends to offer greater abrasion resistance. Rotating between several straps and storing them away from heat sources will significantly extend 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