Rolex · Datejust 31

Strap for Datejust 31 Rolesor Everose Domed / Jubilee / Black MOP

Takes 16 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width16 mm
Case diameter31 mm
Reference178241-0043
FamilyDatejust 31
MovementRolex caliber 2235 hours, minutes, seconds | date | chronometer
CaseMother of Pearl | Rose Gold, Stainless Steel

Spring bar

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The right category for this model · choose the 16 mm size

Straps for the Datejust 31 178241-0043

Selected for the 16 mm lug width

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The Datejust 31 178241-0043, seen from the bench

The Rolex Datejust 31 Rolesor Everose features a 31mm case combining 18K Everose gold and stainless steel, with black Mother-of-Pearl dial and fluted bezel. Equipped with the automatic Rolex caliber 2235 (COSC-certified chronometer, approximately 50-hour power reserve), this reference 178241-0043 includes a date window with 2.5x Cyclops lens and screw-down Twinlock crown for 100m water resistance. The lug width is 16mm.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 reference 178241-0043?

The Rolex Datejust 31 reference 178241-0043 is equipped with a 16mm lug width, a standard Rolex measurement designed for models with a case diameter under 34mm. Measurement must be taken perpendicular to the case at the primary attachment points. Any aftermarket strap must strictly conform to this dimension to ensure proper fit and aesthetic harmony.

What is the best strap for the Rolex Datejust 31 178241-0043?

The ideal strap depends on usage and personal preference. For formal occasions, a dark brown or cognac alligator strap with vegetable tanning creates an elegant contrast with the Rolesor rose gold case. For daily wear, a smooth black calf leather strap offers maximum versatility. In summer, a heavyweight canvas NATO or FKM rubber strap maintains the watch's dignity. The clasp should be a three-link deployante in stainless steel or rose gold for durability and comfort.

How do I change the strap on my Datejust 31?

Strap replacement requires a specific tool: a spring bar tool or small steel lever. Place the watch on a flat surface, locate the spring bars (small metal cylinders) securing the strap to the lugs, and gently push inward with the tool to free the bar. Remove the old strap and insert the new one by sliding the spring bar into the lugs. Ensure the bar is fully seated before wearing the watch. If unsure, consult a certified watchmaker.

Can an aftermarket strap damage the Rolex Datejust 31 case?

A high-quality aftermarket strap will not damage the Rolex case if the lug width is correct (16mm for the 178241-0043). However, non-conforming or poorly made straps may cause micro-scratches at the lugs during installation or frequent changes. Choose straps made by specialised artisans using premium materials and certified compatibility. Milano Straps provides each strap with detailed instructions and 18 months of post-sale support for manufacturing defects.

How long does a leather strap last on a wristwatch?

A quality leather strap (alligator, calf, shell cordovan) typically lasts 3-5 years with daily use and regular maintenance. Lifespan depends on multiple factors: intensity of use, climate (humidity and heat accelerate ageing), cleaning frequency, and tanning quality. Vegetable-tanned leather generally outlasts chemically treated leather because it develops a protective patina over time. To extend strap life, store it in a dry environment, clean monthly with a damp cloth, and apply protective balm every 6-12 months.

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