Specifications
- Reference
- F2040021
- Family
- Novonaut
- Category
- Chronograph
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 42 mm
- Case thickness
- 15 mm Official
- Lug-to-lug
- 51 mm Official
- Lug width
- —
- Water resistance
- 200 m
- Bezel
- —
- Calibre
- Werk 17 TR Official
- Power reserve
- 70 h
Official product page · retrieved October 25, 2026
Does it fit your wrist?
Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.
Comfortable
Lug-to-lug 51 mm on a flat top of 54.1 mm: 94 % of the width.
Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.
Measurements and sources
Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.
Case thickness
| Value | Type | Source | Date |
|---|---|---|---|
| 15 mm | Official | Fortis | October 25, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 51 mm | Official | Fortis | October 25, 2026 |
Lug width
Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.
No source gave this figure yet.
Calibre source
Official Fortis · retrieved October 25, 2026
Other versions in the same case
These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.
Other Novonaut references
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Novonaut N-42 F2040008 | 42 mm | 15 mm | 51 mm | Werk 17 |
Other Fortis models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Flieger F-43 Bicompax F4240004 | 43 mm | 15.5 mm | 54 mm | UW-51 |
| Stratoliner S-41 F2340006 | 41 mm | 14.5 mm | 50.5 mm | Werk 17 |
| Flieger F-41 F4220008 | 41 mm | 12.5 mm | 52 mm | UW-30 |
| Flieger F-41 Werk 7 F4220030 | 41 mm | 12.5 mm | 52 mm | Werk 7 |
| Flieger F-39 F4220005 | 39 mm | 12.5 mm | 50 mm | UW-30 |
| Flieger F-39 Werk 7 F4220028 | 39 mm | 12.5 mm | 50 mm | Werk 7 |
Show 4 more
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Flieger F-43 Triple-GMT F4260000 | 43 mm | 15.5 mm | 54 mm | Werk 13 |
| Marinemaster M-40 F8120024 | 40 mm | 12 mm | 43 mm | UW-30 |
| Marinemaster M-44 F8120013 | 44 mm | 14 mm | 48 mm | Werk 11 |
| Vagabond V-40 F6660000 | 40 mm | 13.9 mm | 46.5 mm | Werk 13 |