TAG Heuer · Formula 1

Strap for Formula 1 Chronograph Quartz 41 Stainless Steel / Diamond / White / Bracelet

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

Lug width20 mm
Case diameter41 mm
ReferenceCAH1213.BA0863 (aka: CAH1213BA0863, CAH1213)
FamilyFormula 1
MovementRonda caliber 5021.D hours, minutes, small seconds | date | Chronograph
CaseCeramic, Stainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the Formula 1 CAH1213.BA0863 (aka: CAH1213BA0863, CAH1213)

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Formula 1 CAH1213.BA0863 (aka: CAH1213BA0863, CAH1213), seen from the bench

The Formula 1 belongs to TAG Heuer's sports collection dedicated to the world of motor racing. The CAH1213.BA0863 model is equipped with the Ronda 5021.D quartz movement with hour, minute, small seconds, date and chronograph functions. The watch features technical characteristics oriented towards sporty use with a multifunction analog display.

Frequently asked questions

What is the exact lug width of the TAG Heuer Formula 1 CAH1213.BA0863?

The lug width of the TAG Heuer Formula 1 CAH1213.BA0863 is 20mm, measured from inner edge to inner edge at the lugs where the strap attaches. Always verify this measurement before purchasing an aftermarket strap, as any deviation would result in binding or excessive play at the attachment points.

Which strap material works best with the TAG Heuer Formula 1 CAH1213.BA0863?

The optimal choice for the Formula 1 CAH1213.BA0863 is American alligator leather or vegetable-tanned calfskin. Alligator preserves the sporty character whilst offering superior scratch resistance and a unique patina development over time. For genuinely motorsport-focused use, NATO straps in nylon or vulcanised synthetic rubber provide complete water resistance. A stainless steel deployante clasp is preferred to minimise torsional stress on the leather.

How do you change the strap on the TAG Heuer Formula 1 CAH1213.BA0863?

To change the strap on the TAG Heuer Formula 1 CAH1213.BA0863, use a spring bar tool inserted into the recesses on either side of the lug. Apply gentle upward pressure to compress the internal spring, then slide the spring bar out. Position the new strap, align the lug hole, and let the spring mechanism snap back into place. Ensure the strap sits perfectly horizontal and isn't twisted.

Is an aftermarket strap compatible with the TAG Heuer Formula 1 CAH1213.BA0863?

Yes, an aftermarket strap is compatible provided the lug width is precisely 20mm. Verify that your chosen strap is manufactured to this exact specification and that the spring bars are stainless steel quality. Milano Straps certifies every strap's compatibility with the specific model and lug width required.

What is the lifespan of a leather strap on the TAG Heuer Formula 1 CAH1213.BA0863?

A quality leather strap typically lasts 3–5 years of daily wear if crafted from alligator or shell cordovan, with beautiful patina development throughout. Vegetable-tanned calfskin typically delivers 2–4 years of use. Regular maintenance—monthly cleaning, protection from saltwater and direct heat—significantly extends strap longevity. All Casati Milano bespoke straps include an 18-month warranty.

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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only