Rolex · Day-Date 40

Strap for Rolex Day-Date 40 228238

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference228238
FamilyDay-Date 40
MovementRolex caliber 3255 Hours, Minutes, Seconds | Date, Day | Chronometer

Recommended spring bar

Spring bars Rolex Daytona 116520 — 20mm steel

Technical match for lug width and diameter · lug 20 mm · Ø 1.5 mm · closed lugs

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Straps for the Day-Date 40 228238

Selected for the 20 mm lug width · workshop selection

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The Day-Date 40 228238, seen from the bench

The Day-Date 40 represents the evolution of the classic Rolex wristwatch with day and date indication. It is powered by the automatic Calibre 3255 with chronometer certification and provides hour, minute, second, date and day of the week functions. The 40mm case is in yellow gold with 20mm lugs.

Frequently asked questions

What is the lug width of the Rolex Day-Date 40 228238?

The lug width (ansa) of the Rolex Day-Date 40 228238 is 20mm, measured from the inside of the lug shoulder on the case. This measurement is essential when purchasing aftermarket replacement straps.

What is the best strap for the Rolex Day-Date 40 228238?

For the 228238 in 18-carat yellow gold, the best strap is premium alligator leather in dark brown or cognac tones. Alternatively, vegetable-tanned calf leather develops a beautiful patina over time, whilst shell cordovan provides superior durability. Your choice depends on usage: formal occasions (alligator), versatile daily wear (calf), or maximum resistance (shell cordovan).

How do I change the strap on the Rolex Day-Date 40 228238?

Removing the original strap requires a spring bar remover tool to extract the spring bars that fix the strap to the lugs. It is advisable to have a professional watchmaker perform this operation to avoid damaging the case. Once the old strap is removed, insert the spring bars into the new strap and secure them to the lugs, ensuring the lug pad is properly positioned.

Is an aftermarket leather strap compatible with the Rolex Day-Date 40 228238?

Yes, provided the strap is manufactured for a 20mm lug width. Always verify the technical specifications from the seller. Custom-made artisan straps allow you to choose the material (alligator, calf, shell cordovan), colour, texture, and buckle type, adapting to your aesthetic preferences and intended use.

How long does a leather strap last on a Rolex Day-Date 40?

Longevity depends on material quality and maintenance. Premium alligator lasts 3-5 years with daily wear; vegetable-tanned calf 2-4 years (developing patina); shell cordovan 5-7 years (most durable). Maintenance includes regular cleaning with a damp cloth, protection from salt water and solvents, and conditioning 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