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Rolex · Datejust 31

Strap for Datejust 31 Stainless Steel Domed Diamond / Jubilee / White

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
Reference178344-0045
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 178344-0045

Selected for the 16 mm lug width

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The Datejust 31 178344-0045, seen from the bench

The Datejust 31 Stainless Steel Domed Diamond ref. 178344-0045 combines white gold bezel and Oystersteel case in a 31mm diameter, housing the automatic Rolex caliber 2235 with bidirectional winding, approximately 48-hour power reserve and COSC chronometer certification. The case features Oyster specifications with screw-down caseback and Twinlock crown, waterproofed construction. Date window at 3 o'clock displays through Cyclops lens integrated in sapphire crystal. Lug width is 16mm, requiring dedicated strap compatibility.

Frequently asked questions

What is the lug width of the Rolex Datejust 31 reference 178344-0045?

The Rolex Datejust 31 ref. 178344-0045 has a lug width of 16mm. This measurement is taken with a digital calliper positioned internally between the two lugs, with the case lying flat on a surface. It is the critical specification for selecting a compatible aftermarket strap without lateral play.

What is the best strap for the Rolex Datejust 31 178344-0045?

Given the white gold and steel combination of the ref. 178344-0045, the most suitable materials are alligator belly in cool tones (midnight blue, smoke grey) and vegetable-tanned calf leather for those who appreciate a natural patina over time. Shell cordovan is recommended for a compact profile at the lugs. A deployant clasp in steel or white gold prolongs the life of the leather strap by reducing mechanical stress on the closing hole.

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

The strap on a Rolex Datejust 31 is removed using a spring bar tool inserted into the hole on the inner side of the lug. It is advisable to rest the watch on a soft cushion to avoid scratching the bezel or case. For models fitted with an integrated Jubilee or Oyster bracelet, a dedicated spring bar tool with the appropriate head for that bracelet type is required.

Are there aftermarket straps compatible with the Rolex Datejust 31 178344-0045?

Yes. Aftermarket straps with a 16mm lug width are compatible with the Datejust 31 ref. 178344-0045, provided the ends are finished to match the curve radius of Rolex lugs. Milanostraps.it offers a selection of handcrafted 16mm straps in leather, alligator and rubber, with stitching and profiles dimensioned specifically for this case.

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

The lifespan of a leather strap depends on the material and daily usage. A quality alligator strap, properly maintained and kept away from prolonged exposure to water and perspiration, retains its structural integrity and appearance for 3 to 5 years. Vegetable-tanned calf develops an appealing patina but is more sensitive to moisture. Shell cordovan, with its dense fibre structure, is particularly resistant to deformation at the lugs and generally outlasts other leather types. A deployant clasp significantly reduces wear on the buckle holes.

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