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TAG Heuer · Aquaracer

Strap for Aquaracer 300M Quartz Chronograph 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 width

20mm
20 mm strapsAll TAG Heuer
Lug width20 mm
Case diameter43 mm
ReferenceCAY111B.BA0927
FamilyAquaracer
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

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Straps for the Aquaracer CAY111B.BA0927

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The Aquaracer CAY111B.BA0927, seen from the bench

The TAG Heuer Aquaracer CAY111B.BA0927 is a 43mm stainless steel quartz chronograph from the sports-nautical Aquaracer family, rooted in 1960s pilot and diving chronographs. It features a 20mm lug width, anti-reflective sapphire crystal, and is powered by a Ronda 5040.D quartz movement with ±15 seconds monthly precision. The brushed steel case with polished bezel is water-resistant beyond 300 metres and develops a distinctive patina over time.

Frequently asked questions

What is the lug width of the TAG Heuer Aquaracer CAY111B.BA0927?

The lug width of the TAG Heuer Aquaracer CAY111B.BA0927 is 20mm. This measurement corresponds to the distance between the two horizontal spring bars of the case. Always verify compatibility by measuring with a digital calliper before purchasing aftermarket straps.

Which strap material is best suited for this chronograph?

The TAG Heuer Aquaracer CAY111B.BA0927 pairs ideally with dark alligator leather (black, chocolate brown), which emphasises contrast with the brushed steel case. Alternatively, vegetable-tanned calf leather, cotton NATO tape, or fluoroelastomer rubber (Viton) are highly compatible choices reflecting the model's sporting and nautical heritage.

How do I change the strap on my TAG Heuer Aquaracer?

Strap replacement requires removal of two spring bars using a thin lever (spring bar tool). Position the watch on a soft surface, insert the lever into the spring release hole, push towards the case centre, and gently extract the pin. Repeat for the second side. Install the new strap by aligning the pins and pressing until the locking click engages.

Can I use an aftermarket 20mm strap on this model?

Yes, any strap with a 20mm lug width is compatible with the TAG Heuer Aquaracer CAY111B.BA0927. Ensure the strap thickness (at the lug position beneath the case) does not exceed 3.5mm, otherwise friction with the case back may occur.

How long does a leather strap last on this watch?

A quality leather strap (alligator, calf, shell cordovan) on a 43mm watch like the CAY111B.BA0927 typically lasts 24–36 months with daily wear, extendable to 4–5 years with proper care (drying after moisture, protection from direct sunlight). Viton rubber exceeds 5 years without significant degradation.

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