Strap for Chronomat B01 42 Stainless Steel / Black / UK

The lug width of the Breitling Chronomat B01 42 AB01341B1B1A1 is 22mm. This measurement is taken with a digital calliper positioned inside the lugs, against the lateral walls of the case. It is the standard dimension across the entire Chronomat 42 family and determines compatibility with any aftermarket strap.

For the Chronomat B01 42 with a black dial, the most suitable options are: hornback alligator in black or dark grey for a sport-elegant combination, vegetable-tanned calf leather for a natural patina that develops with wear, bicolour nylon NATO to echo the aeronautical heritage, and vulcanised rubber for intensive or maritime use. A brushed steel deployant clasp is the most technically coherent choice for the instrument-watch spirit of this chronograph.

The strap on the Chronomat B01 42 is replaced using a flat spring bar tool or a blunt-tipped instrument. The lugs accommodate standard 22mm spring bars. Simply compress the spring bar, slide out the existing strap, and insert the new one until it clicks into place. This operation takes only a few minutes and does not require sending the watch to an authorised service centre.

Yes, any strap with a 22mm lug width is technically compatible with the Chronomat B01 42. Milano Straps offers a selection of handcrafted straps in various materials — alligator, calf leather, NATO, and rubber — made to precise dimensions to ensure a correct fit and secure fastening within the original Breitling 22mm lugs.

The lifespan of a leather strap depends on the quality of the tanning process, daily wear, and exposure to perspiration and moisture. A quality handcrafted leather strap, worn in rotation with other watches and cleaned regularly, typically lasts between 2 and 4 years. Alligator or shell cordovan straps, due to the superior fibre density of these leathers, tend to outlast standard calf leather considerably.