Strap for Chronomat B01 42 Stainless Steel - Diamond / Black / Rubber

The lug width of the Breitling Chronomat B01 42 AB0134721B1S2 is 22 mm. This measurement corresponds to the internal distance between the two lugs of the case and is essential for ensuring the correct fit of any aftermarket or replacement strap.

The most suitable materials for the Chronomat B01 42 are vegetable-tanned calf leather with a pronounced grain, bombé alligator in tobacco or anthracite tones, ballistic nylon NATO for a sporting aesthetic faithful to the watch's aviation origins, and vulcanised rubber for intensive technical use. The choice depends on the intended use and the desired chromatic pairing with the dial.

To replace the strap, you will need a springbar tool. Carefully remove the two springbars housed in the 22 mm lugs, taking care not to scratch the stainless steel case. Insert the new strap and ensure the springbars click firmly into position in both lugs. It is advisable to have this operation carried out by a watchmaker or trained specialist to preserve the integrity of the case.

Yes, there are numerous compatible aftermarket straps available. It is simply necessary for the strap to have a 22 mm attachment width and standard springbars. Milano Straps offers a curated selection of handcrafted 22 mm straps — in leather, alligator, NATO and rubber — available both bespoke and ready to ship, designed to complement the technical and visual character of the Chronomat.

The lifespan of a leather strap depends on the quality of the tanning, frequency of use, and exposure to perspiration and water. A high-quality vegetable-tanned calf leather strap, with moderate daily wear, typically lasts between 18 and 36 months. Straps crafted by Casati Milano carry an 18-month guarantee against manufacturing defects. To extend strap life, prolonged contact with water should be avoided and a leather conditioner applied periodically.