| 28 cm kanon M/12 | |
|---|---|
 | |
| Type | Naval artillery |
| Place of origin | Sweden |
| Service history | |
| In service | 1916–1957 |
| Production history | |
| Designer | Bofors |
| Designed | 1912 |
| Manufacturer | Bofors |
| No. built | 12 |
| Specifications | |
| Mass | 44.1 t (43.4 long tons; 48.6 short tons) |
| Length | 12,735 mm (41 ft 9 in) |
| Barrel length | 12,295 mm (40 ft 4 in) (45 caliber) |
| Shell | 305 kg (672 lb) |
| Caliber | 283 mm (11.1 in) |
| Elevation | -10°/+20° (5°/s) |
| Traverse | 150° from either side of centreline (4°/s) |
| Rate of fire | 3-4 rpm |
| Muzzle velocity | 860–870 m/s (2,800–2,900 ft/s) |
| Maximum firing range | 19,600 m (21,400 yd) (25,000m post 1930's) |
The Bofors 283 mm M/12 naval gun was a naval rifle of 283 millimetres (11.1 in) and 45 calibers used as the main battery of the Swedish Sverige-class coastal defence ships. It was designed and built by Bofors a few years before the First World War.
