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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel Diamond / Oyster / Pink - Diamond

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
Reference178384-0064
FamilyDatejust 31
MovementRolex caliber 2235 hours, minutes, seconds | date | chronometer
CaseWhite Gold, Stainless Steel

Spring bar

Spring bars for Rolex

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

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Straps for the Datejust 31 178384-0064

Selected for the 16 mm lug width

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The Datejust 31 178384-0064, seen from the bench

The Rolex Datejust 31 ref. 178384-0064 features a 31mm case in white gold and Oystersteel with a diamond-set bezel. It houses the Rolex caliber 2235, an automatic movement with COSC chronometer certification, offering a precision of +2/-2 seconds per day and a 48-hour power reserve. Water-resistant to 100 meters, this model requires a 16mm lug width strap, which is specific to the Datejust 31 and not interchangeable with other Datejust sizes. Proper measurement using a digital caliper between the lugs is essential before ordering an aftermarket strap.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 ref. 178384-0064?

The Rolex Datejust 31 ref. 178384-0064 has a lug width of 16mm. This measurement must be taken with a digital calliper between the two lugs, at the spring bar seating point, and does not correspond to the external width of the case. This is a specific dimension of this intermediate format, distinct from the 13mm of the Datejust 28 and the 20mm of the Datejust 36.

What is the best strap for the Rolex Datejust 31 178384-0064?

For the Datejust 31 178384-0064 in white gold and steel with a diamond-set bezel, an alligator strap with belly grain is the most coherent choice given the formal register of the watch. Shell cordovan offers a dense surface with a luminous patina that develops over time. For everyday use, vegetable-tanned calf leather provides comfort and chromatic versatility. A deployant clasp in brushed steel completes the metallic pairing with the Oyster case.

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

Replacing the strap on the Datejust 31 requires a dedicated spring bar tool. The original Rolex spring bars are press-fit and require a fine-tipped tool (1.0–1.2mm) to engage the lateral slots within the lugs. It is advisable to rely on a watchmaker or an experienced strap craftsman to avoid scratching the white gold case. Casati Milano provides dedicated assistance for the fitting stage as well.

Are there aftermarket straps compatible with the Rolex Datejust 31 178384-0064?

Yes. The Datejust 31 ref. 178384-0064 accepts any aftermarket strap with a 16mm lug width and straight or shaped ends. It is important to verify the end curvature: some manufacturers offer curved tips designed to follow the profile of Rolex lugs. Milano Straps offers a selection of handcrafted 16mm compatible straps, made in Italy, with bespoke customisation available 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 tanning quality, daily use, and maintenance. A top-grade alligator or shell cordovan strap, treated periodically with a suitable leather conditioner, can last between three and seven years with regular wear. Vegetable-tanned calf leather develops a beautiful patina but is more sensitive to moisture. All Casati Milano straps carry an 18-month warranty against manufacturing defects.

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