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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel / Yellow Gold / Domed / Olive - Floral / 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
Reference278243-0032
FamilyDatejust 31
MovementRolex caliber 2236 Hours, Minutes, Seconds | Date | Chronometer
CaseYellow Gold, Stainless Steel

Spring bar

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Straps for the Datejust 31 278243-0032

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The Datejust 31 278243-0032, seen from the bench

The Datejust 31 ref. 278243-0032 is the mid-size version of the Datejust line, introduced in 1945. It features a 31mm Oyster case in Oystersteel with a fluted yellow gold 18k bezel, combined with a Jubilee bracelet in two-tone material. The dial displays a floral motif with diamond indices. The watch is powered by the Rolex caliber 2236, a COSC-certified Chronometer movement tested to Rolex's Superlative standards with a tolerance of ±2 seconds per day, featuring the proprietary Syloxi silicon hairspring. The case is water-resistant to 100 meters with a Twinlock screw-down crown. The date window is equipped with a Cyclops magnifying lens. The lug width is 16mm.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 ref. 278243-0032?

The Rolex Datejust 31 reference 278243-0032 features an Oyster case with a lug width of 16mm. This measurement is taken internally between the two lugs using a calliper. It is essential to respect this dimension when selecting any aftermarket strap: even a 1mm discrepancy will prevent correct fitment between the lugs.

What is the best strap for the Rolex Datejust 31 278243-0032?

For the Datejust 31 in Yellow Rolesor (ref. 278243-0032), straps in vegetable-tanned alligator — preferably in cognac, bordeaux or black tones — represent the most coherent choice given the formal character and the gold/steel combination of the case. Box-calf leather is a versatile alternative for daily wear. In all cases, the correct width is 16mm.

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

Replacing the strap on a Datejust 31 requires a spring bar tool or a dedicated Rolex bracelet tool with a screw-in spring bar, depending on the attachment type in use. For aftermarket straps with standard spring bars, a bifurcated-tip spring bar tool is sufficient. It is advisable to work on a soft surface to protect the lugs and the Oyster case back from scratches. If in any doubt, consult a qualified watchmaker.

Are there aftermarket straps compatible with the Rolex Datejust 31 278243-0032?

Yes. The aftermarket offers a wide selection of compatible 16mm straps for the Datejust 31. Milano Straps provides handcrafted options in alligator, calf leather, shell cordovan and rubber, made to order at the Casati Milano atelier or available for immediate purchase online. Compatibility is ensured by the correct lug width (16mm) and an appropriate length for the wearer's wrist circumference.

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

The lifespan of a leather strap depends on the quality of the hide, the tanning process and usage habits. A high-quality vegetable-tanned alligator strap, properly maintained (avoiding prolonged exposure to water and perspiration, with periodic conditioning), can last between 3 and 7 years while retaining structural and aesthetic integrity. Shell cordovan, due to its dense fibrous structure, is among the most durable leathers. Box-calf straps typically last 2 to 4 years with regular use.

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