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TAG Heuer · Formula 1

Strap for Formula 1 Chronograph Quartz 43 Stainless Steel / Grey / Bracelet

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

Lug width

20mm
20 mm strapsAll TAG Heuer
Lug width20 mm
Case diameter43 mm
ReferenceCAZ1011.BA0842
FamilyFormula 1
MovementRonda caliber 5040.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

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Straps for the Formula 1 CAZ1011.BA0842

Selected for the 20 mm lug width · workshop selection

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The Formula 1 CAZ1011.BA0842, seen from the bench

The TAG Heuer Formula 1 CAZ1011.BA0842 is a 43mm stainless steel chronograph featuring a Ronda caliber 5040.D movement. The case combines stainless steel with high-tech ceramic accents, paired with a black dial, sapphire crystal, and luminous hands. With a 20mm lug width, this model from the 1986-founded racing collection delivers sport functionality and contemporary design coherence without compromise.

Frequently asked questions

What is the lug width of the TAG Heuer Formula 1 CAZ1011.BA0842?

The lug width of the TAG Heuer Formula 1 CAZ1011.BA0842 is 20mm. This is the horizontal distance between the two lugs that connect the case to the bracelet. It is essential to verify this specification before purchasing an aftermarket strap, as not all 43mm models adopt this width.

What is the best strap for the TAG Heuer Formula 1 CAZ1011.BA0842?

There is no universal choice, as it depends on the context of use and aesthetic preferences. Alligator offers formal elegance and visual coherence; vegetable-tanned calf leather develops a patina over time; tactical NATO emphasises the sporting DNA; vulcanised rubber is ideal for summer and water activities; shell cordovan represents a compromise between nobility and longevity. The ceramic and stainless-steel case pairs particularly well with straps in neutral or warm tones.

How do I change the strap on the TAG Heuer Formula 1 CAZ1011.BA0842?

Strap replacement should be performed using specialised tools such as a spring bar tool or dedicated lug extractor. It is advisable to proceed with caution to avoid scratching the ceramic case, which is scratch-resistant but vulnerable to concentrated impact. If you lack experience, consult a professional watchmaker or contact the Casati Milano atelier for specialised assistance.

Can I mount an aftermarket strap with 20mm lug width on this watch?

Yes, any strap with a 20mm lug width is compatible with the TAG Heuer Formula 1 CAZ1011.BA0842. Milano Straps offers a wide range of artisanal 20mm straps, customisable in material, colour, dimensions and thread colour. For a fully bespoke solution, the Casati Milano atelier creates custom straps with styling consultation and an 18-month warranty.

How long does a natural leather strap last on a chronograph like this?

Durability depends on the material and conditions of use. An alligator or shell cordovan strap with vegetable tanning can last 3 to 5 years with intensive daily use, developing a desirable patina. Vegetable-tanned calf leather tends to age more rapidly but acquires aesthetic character. Vulcanised rubber is more resistant to wear but less noble in appearance. Milano Straps guarantees 18 months on all bespoke straps with the possibility of regeneration and revision over time.

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