A low-powered gun used only on submarines. Used a horizontal sliding block.

Gun Characteristics

Designation 120 mm/45 (4.7") Model 1931
Ship Class Used On Balilla, Fieramosca, Micca and Calvi Classes
Date of Design 1931
Date In Service 1933
Gun Weight 3.2 tons (3,484 kg)
Gun Length oa N/A
Number of Grooves N/A
Bore Length 212.6 in (5.400 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 8 rounds per minute


Type Separate
Projectile Types and Weights HE: 48.5 lbs. (22 kg)
AP: 51.0 lbs. (23.15 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity 2,395 fps (730 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 48.5 lbs. (22 kg) HE
Shell Distance
35 degrees 15,860 yards (14,500 m)

Mount/Turret Data

Designation Single open mounts
Weight N/A
Elevation -4 / +35 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil N/A


Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "Italian Warships of World War II" by Aldo Fraccaroli

Page History

16 May 2006
26 May 2012
Updated to latest template