Fortis · Novonaut

Strap for Novonaut N-42 Cobalt Blue Edition / Hybrid Strap

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

Lug width22 mm
Case diameter42 mm
ReferenceF2040013
FamilyNovonaut
MovementFortis caliber Werk 17 hours, minutes, small seconds | date, day | Chronograph, column wheel
Year2023
CaseCeramic, Stainless Steel

Spring bar

Swiss Standard universal spring bars

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

Straps for the Novonaut F2040013

Selected for the 22 mm lug width · workshop selection

All 22 mm straps →

The Novonaut F2040013, seen from the bench

The Fortis Novonaut reference F2040013 is equipped with the Werk 17 caliber featuring hours, minutes, small seconds, date, day, and column-wheel chronograph functions. The watch has 22mm lugs for the strap. The movement offers chronograph complications integrated into the dial design.

Frequently asked questions

What is the lug width of the Fortis Novonaut F2040013?

The Fortis Novonaut F2040013 features a lug width of 22mm. This measurement represents the distance between the two lugs where the strap attaches to the case. It is essential to verify this dimension before purchasing a replacement strap to ensure correct compatibility.

What type of strap is recommended for the Novonaut F2040013?

For the Novonaut F2040013, we recommend straps in superior-grade alligator, vegetable-tanned calf leather, or technical rubber materials for sports applications. Alligator and vegetable-tanned calf reflect the watch's sophisticated aesthetic, whilst technical materials maintain its aerospace character. Avoid warm colours; prioritise black, dark grey, and dark brown tones.

How do you change the strap on the Fortis Novonaut F2040013?

To change the strap, use a specialised spring bar tool to compress and disengage the elastic pins (spring bars) that retain the strap to the case lugs. Remove the old strap by applying gentle pressure on one side at a time. Insert the new strap, aligning the holes to the 22mm lug width, and ensure the spring bars click securely into position. Avoid forcing the mechanism.

Which aftermarket straps are compatible with the F2040013?

Any strap with a 22mm lug width is compatible with the Fortis Novonaut F2040013. Available options include alligator, shell cordovan, vegetable-tanned calf, suede leather, NATO fabrics, and technical rubber. Milano Straps offers a specialised collection of 22mm straps, handcrafted with vegetable tanning and premium materials.

How long does a leather strap last on the Novonaut F2040013?

The lifespan of a leather strap depends on material quality and usage patterns. A superior-quality vegetable-tanned calf, tanned using traditional methods, can last 3–5 years with moderate wear and proper maintenance (avoiding prolonged moisture and direct sunlight). Alligator, being a more robust material, typically lasts longer. Signs of ageing (patina, minor creasing) do not necessarily indicate end of life.

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.

Request an appointment →

Casati Milano · Via XX Settembre 15, Milan · by appointment only