| Cannone da 135/45 OTO 1937 and 1938, Ansaldo 1938 | |
|---|---|
| Type | Naval gun |
| Place of origin | Italy |
| Service history | |
| In service | 1940 - 1972 |
| Used by | Kingdom of Italy |
| Wars | Second World War |
| Production history | |
| Designer | Odero Terni Orlando |
| Manufacturer | Odero Terni Orlando Ansaldo |
| Specifications | |
| Mass | 6.01 t (13,200 lb) |
| Length | 6.075 m (19 ft 11.2 in) |
| Shell weight | AP and HE: 32.7 kg (72 lb) |
| Caliber | 135 mm (5.3 in) |
| Elevation | -5° to +45° |
| Rate of fire | 6-7 rounds per minute |
| Muzzle velocity | 825 metres per second (2,710 ft/s) |
| Maximum firing range | 19,600 m (21,400 yd) |
The Cannone da 135/45 OTO 1937 was a 135 mm (5.3 in) 45-caliber naval gun built for the Regia Marina in the late 1930s. Built as a response to the French Canon de 138 mm Modèle 1929, it was meant to have the same range as the widespread 120 mm gun, but with less muzzle velocity and less dispersion.[1]