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Breitling · Chronomat B01 42

Strap for Chronomat B01 42 Stainless Steel / Copper / Rouleaux

Takes 22 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width

22mm
22 mm strapsAll Breitling
Lug width22 mm
Case diameter42 mm
ReferenceAB0134101K1A1
FamilyChronomat B01 42
MovementBreitling caliber Caliber B01 Hours, Minutes, Small Seconds | Date | Chronograph, Column wheel | Chronometer
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 Chronomat B01 42 AB0134101K1A1

Selected for the 22 mm lug width · workshop selection

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The Chronomat B01 42 AB0134101K1A1, seen from the bench

The Breitling Chronomat B01 42 AB0134101K1A1 is a 42mm stainless steel chronograph born in 1984 as the official instrument of the Frecce Tricolori and Patrouille Suisse aerobatic teams. It features the characteristic rider tabs at 3, 6, 9 and 12 o'clock for operation with gloved hands, and houses the in-house B01 movement, COSC-certified chronometer with -4 to +6 seconds per day accuracy and 70-hour power reserve. The 22mm lug width accommodates a wide range of aftermarket straps and reflects professional tool design philosophy. Water-resistant to 200 metres.

Frequently asked questions

What is the lug width of the Breitling Chronomat B01 42 AB0134101K1A1?

The lug width of the Breitling Chronomat B01 42 AB0134101K1A1 is 22mm. This measurement is taken with a digital calliper inside the lugs, at the point where the case meets the strap, without compressing the fitted strap.

What is the best strap for the Breitling Chronomat B01 42 AB0134101K1A1?

For the Chronomat B01 42, the ideal choice depends on intended use: a perforated rally-style strap enhances the model's motorsport and aviation heritage; vegetable-tanned calfskin develops an authentic patina with daily wear; semi-matte alligator is best suited to formal occasions. The 22mm lug width is compatible with the full Milano Straps range.

How do you change the strap on a Breitling Chronomat B01 42?

Changing the strap on the Chronomat B01 42 requires a spring bar tool or a fine-tipped instrument to release the spring bars from the lugs. Work on a soft surface to protect the case. Standard 22mm spring bars are compatible. If in doubt, consult a watchmaker or visit the Casati Milano atelier.

Are there aftermarket straps compatible with the Breitling Chronomat B01 42 AB0134101K1A1?

Yes. Any strap with a 22mm lug width is technically compatible with the Breitling Chronomat B01 42 AB0134101K1A1. Milano Straps offers a curated selection of handcrafted 22mm straps in leather, rubber and fabric, available in various lengths and finishes.

How long does a leather strap last on a Breitling Chronomat B01 42?

Strap longevity depends on material quality and maintenance. A well-maintained vegetable-tanned calfskin strap typically lasts 2 to 4 years with daily wear. Alligator, owing to its dense fibrous structure, can exceed 5 years. Milano Straps products carry an 18-month warranty against manufacturing defects.

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