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Rolex · Datejust 31

Strap for Datejust 31 Rolesor Everose Fluted / Jubilee / Silver Computer

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
Reference178271-0043
FamilyDatejust 31
MovementRolex caliber 2235 hours, minutes, seconds | date | chronometer
CaseRose 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 178271-0043

Selected for the 16 mm lug width

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The Datejust 31 178271-0043, seen from the bench

The Rolex Datejust 31 ref. 178271-0043 belongs to the longest-established lineage of sport-elegant watchmaking, introduced in 1945 as the first automatic date watch. This 31mm Rolesor Everose variant—combining Oystersteel and 18-karat Everose gold—features a fluted bezel with diamonds and a silver computer dial. The Oyster case houses the Rolex caliber 2235 automatic movement with Glucydur balance and Parachrom blue hairspring, COSC-certified. Water-resistant to 100 meters via Twinlock crown, the 16mm lug width accepts specifically-engineered straps with shaped endlinks matching the curved Oyster lug profile.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 178271-0043?

The Rolex Datejust 31 ref. 178271-0043 has a lug width of 16mm. This measurement should be taken internally between the lugs using a digital calliper at the narrowest point where the strap fits. This is a dimension specific to the 31mm variant and is not interchangeable with the 18mm of the 36mm Datejust or the 20mm of the 41mm model.

What is the best strap for the Rolex Datejust 31 178271-0043?

For the Datejust 31 178271-0043 in Rolesor Everose, alligator straps with belly or hornback grain are the most coherent choice for the elegant character of the case. Vegetable-tanned calf leather suits those who appreciate a natural patina developing over time. For more active use, vulcanised rubber in 16mm maintains proportion and comfort. A clasp or deployant buckle in 18ct rose gold completes the material consistency with the case.

How do you change the strap on a Rolex Datejust 31 178271-0043?

To replace the strap on the Datejust 31 178271-0043, a fine-tipped spring bar tool is required. The spring bars are released by compressing their ends inward within the lug channel. It is advisable to work on a soft surface to protect the polished Rolesor Everose case surfaces. If you lack experience, it is preferable to consult a watchmaker or visit the atelier to avoid scratching the lugs.

Are there aftermarket straps compatible with the Rolex Datejust 31 178271-0043?

Yes. Aftermarket straps of 16mm with curved ends are compatible with the Datejust 31 178271-0043, provided the end profile matches the curvature of the Oyster lug. Milano Straps crafts artisanal straps specifically shaped for this geometry, available in alligator, calf leather, shell cordovan and rubber. The recommended standard length is 75/115mm or 70/110mm for smaller wrists.

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

The lifespan of a leather strap depends on the material and care. A high-quality alligator strap, worn daily and stored correctly away from prolonged perspiration or moisture, will maintain its structure and appearance for 2–4 years. Vegetable-tanned calf leather develops a patina but may require replacement after 18–24 months of intensive wear. Casati Milano straps carry an 18-month guarantee 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