TAG Heuer · Formula 1

Strap for Formula 1 Chronograph Quartz 43 Stainless Steel / Blue / 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 diameter43 mm
ReferenceCAZ101K.BA0842
FamilyFormula 1
MovementRonda caliber 5040.D hours, minutes, small seconds | date | Chronograph
CaseStainless 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 CAZ101K.BA0842

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Formula 1 CAZ101K.BA0842, seen from the bench

The Formula 1 represents the sporty line of TAG Heuer dedicated to motorsports. It is powered by the Ronda 5040.D quartz caliber with hour, minute, small seconds, date and chronograph functions. The reference CAZ101K.BA0842 features a case with a bidirectional bezel and a screw-down crown to ensure water resistance.

Frequently asked questions

What is the lug width of the TAG Heuer Formula 1 CAZ101K.BA0842?

The lug width of the TAG Heuer Formula 1 CAZ101K.BA0842 is 20mm. This standard measurement allows for the fitting of compatible artisanal straps, freeing you from the factory-integrated steel bracelet. To verify the measurement, use a digital calliper positioned between the two lugs that protrude from the case sides.

Which strap is most suitable for the TAG Heuer Formula 1 CAZ101K.BA0842?

Alligator leather in vegetable tanning and vegetable-tanned calf are the ideal materials for this chronograph. Alligator offers a regular grain texture and natural patina that dialogues with the modern geometry of the case; vegetable-tanned calf guarantees softness and chromatic evolution over time. For intense use and humid environments, FKM rubber straps ensure total grip and complete water resistance.

How do you change the strap on the TAG Heuer Formula 1 CAZ101K.BA0842?

The CAZ101K.BA0842 is equipped with straight lugs. Use a springbar tool with a flat spatula to press the internal spring of the lug and lift the old strap. Once removed, insert the new strap by aligning the holes with the lugs, then release the spring. Work on a soft cloth to prevent scratches. If you lack experience, the Casati Milano atelier offers professional installation.

Is a 20mm aftermarket strap compatible with the TAG Heuer Formula 1 CAZ101K.BA0842?

Yes, any strap with a 20mm lug width is compatible with the CAZ101K.BA0842. Artisanal straps in leather, exotic leathers and technical rubber from milanostraps.it have been selected to balance the sportiness and rigorous geometry of this chronograph. Always verify the lug width before purchase to avoid incompatibility.

How long does a leather strap last on the TAG Heuer Formula 1 CAZ101K.BA0842?

The lifespan of a leather strap depends on materials and usage. A high-quality artisanal alligator or vegetable-tanned calf strap typically lasts 3-5 years of daily wear, with natural patina evolution over time. Vegetable-tanned straps acquire character through natural ageing. The Casati Milano atelier guarantees 18 months on bespoke straps, with the possibility of repair and replacement of components.

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