Rolex · Datejust 31

Strap for Datejust 31 Rolesor Everose Domed Diamond / Oyster / MOP Roman

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
Reference178341-0012
FamilyDatejust 31
MovementRolex caliber 2235 hours, minutes, seconds | date | chronometer
CaseMother of Pearl | Rose Gold, Stainless Steel

Spring bar

Spring bars for Rolex

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

Straps for the Datejust 31 178341-0012

Selected for the 16 mm lug width

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The Datejust 31 178341-0012, seen from the bench

The Rolex Datejust 31 ref. 178341-0012 features a 31 mm case combining Everose gold and 904L stainless steel, with a mother-of-pearl dial and Roman numerals. It houses the COSC-certified caliber 2235 movement with Parachrom hairspring and Paramag balance wheel. The lug width is 16 mm and the magnified date window offers 2.5x magnification for easy readability.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 ref. 178341-0012?

The lug width of the Datejust 31 178341-0012 is 16 millimetres. This dimension is determined by the case width and the metal attachment lugs. It is critical to verify that the replacement strap has exactly 16mm width, measured at the widest point of the lugs. An incompatible strap will either fail to fit correctly or leave unacceptable play on the case.

Which strap material is best suited for the Rolex Datejust 31 178341-0012?

The material choice depends on intended use and personal preference. To enhance the dressy character and mother-of-pearl dial elegance, premium alligator is recommended, creating visual contrast and developing natural patina over time. For daily versatility, oiled calf offers initial comfort and longevity. Vegetable-tanned leather ensures natural aesthetic ageing. NATO fabric straps offer contemporary sport-chic alternatives, whilst vulcanised rubber guarantees maximum practicality. The buckle material should coordinate with the case precious metal: opt for rose gold deployante clasps for coherence with the watch.

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

Strap replacement requires removal of the spring bars securing the strap to the lugs. Acquire a dedicated spring bar tool or consult a professional watchmaker. Position the watch securely, gently press the spring bar pin towards the case centre with the tool, remove the old strap and insert the new one, aligning the holes. Verify that the spring bar clicks correctly into position. To avoid risk of scratches, Casati Milano offers professional strap change service at the atelier by appointment.

Is an aftermarket strap compatible with the Datejust 31 178341-0012?

Yes, provided the aftermarket strap features 16mm lug width and construction quality befitting the watch's prestige. Milano Straps presents a curated collection of artisanal straps in alligator, calf, shell cordovan and technical textiles specifically crafted for this measurement. Always verify compatibility before purchase and consult our 16mm strap catalogue. Material quality and finishing must reflect Rolex standards: natural leather, precise stitching, coordinated metal hardware.

What is the lifespan of a leather strap on a Rolex Datejust 31?

Leather strap longevity depends on material grade, usage intensity and maintenance practices. Premium alligator with vegetable tanning and artisanal finishing may endure 3-4 years of daily wear before replacement, with potential for restoration. Oiled calf offers similar durability, with early aesthetic ageing that remains appealing. Shell cordovan, with specialised tanning, can last 5+ years owing to natural fibre density. All Milano Straps straps include 18-month warranty against manufacturing defects. Regular maintenance—swift drying after moisture exposure, storage in dry environments—significantly extends strap 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