Technical Archive

TAG Heuer
Aquaracer CAY111B.BA0927— lug 20mm

TAG Heuer Aquaracer CAY111B.BA0927: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.

Aquaracer 300M Quartz Chronograph 43 Stainless Steel / Blue / Bracelet

Artisanal Note

"This model requires a precise 20mm lug width to preserve the original sartorial balance."

Technical Specifications

TAG Heuer CAY111B.BA0927
Lug Width
20 mm

The essential strap measurement.

Browse 20mm straps โ†’
Reference

CAY111B.BA0927

Movement

Ronda caliber 5040.D Hours, Minutes, Small Seconds | Date | Chronograph

The Heritage

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 ยฑ15 seconds monthly precision. The brushed steel case with polished bezel is water-resistant beyond 300 metres and develops a distinctive patina over time.

FAQ

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 24โ€“36 months with daily wear, extendable to 4โ€“5 years with proper care (drying after moisture, protection from direct sunlight). Viton rubber exceeds 5 years without significant degradation.