Breitling · Superocean

Strap for Superocean 42 Blue

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter42 mm
ReferenceA1736402.BA30
FamilySuperocean
MovementBreitling caliber Caliber 17 Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

The Superocean A1736402.BA30, seen from the bench

The Breitling Superocean 42 Blue, reference A1736402.BA30, is a professional diving instrument from a lineage established in the 1950s. The 42.00 mm stainless steel case houses a COSC-certified automatic caliber 17 movement, offering daily precision between -4 and +6 seconds. Water-resistant to 300 meters with a screw-down crown and unidirectional bezel, it features satin and polished surfaces expressing technical rigor. The 20 mm lug width accommodates a wide range of aftermarket straps in various materials and styles, from NATO nylon to leather options.

Frequently asked questions

What is the lug width of the Breitling Superocean A1736402.BA30?

The Breitling Superocean A1736402.BA30 has a lug width of 20 mm. This measurement refers to the internal distance between the two lugs of the case and is the key parameter for selecting a compatible strap. Any 20 mm strap can be fitted to this model without the need for adapters.

What is the best strap for the Breitling Superocean A1736402.BA30?

The ideal choice depends on intended use. For aquatic or sporting contexts, a NATO nylon strap or a vulcanised rubber tropical strap offers functional coherence. For daily urban wear, a vegetable-tanned calf leather or a matte alligator strap with contrast stitching enhances the Superocean's dual nature without compromising its instrumental character. A steel deployant clasp is recommended for ease of wear.

How do you change the strap on a Breitling Superocean A1736402.BA30?

The strap is replaced using a fine-tipped springbar tool. Compress the spring bar housed within the lug, remove the existing strap, and insert the new one, ensuring the spring bar clicks securely into both lug holes. The operation takes approximately two minutes and requires no professional equipment, though it is advisable to work on a soft surface to avoid scratching the case.

Are there aftermarket straps compatible with the Breitling Superocean A1736402.BA30?

Yes. Any strap with a 20 mm attachment is technically compatible with the Breitling Superocean A1736402.BA30. Milanostraps.it offers a curated selection of handcrafted straps in various materials — alligator, calf leather, shell cordovan, NATO — made to standardised dimensions that fit the 20 mm lugs of this model perfectly. A standard length of 115/75 mm is recommended for most wrist sizes.

How long does a leather strap last on a dive watch such as the Superocean?

A quality leather strap — particularly alligator or vegetable-tanned calf — fitted to a Breitling Superocean will typically last between 2 and 4 years with daily wear, provided it is kept away from prolonged contact with salt water or chlorine. Leather is not the optimal material for underwater use, but for everyday above-water wear it offers unmatched comfort and develops a unique patina over time. For aquatic use, a rubber or NATO strap is the more durable option. Casati Milano straps carry an 18-month guarantee 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