Designed for use on ocean-going submarines. Breech mechanism was of concentric ring construction.

Gun Characteristics

Designation 100 mm/45 (3.9") Model 1925
Ship Class Used On Redoutable "1,500 tonnes" class

Some oil tankers
Date Of Design 1925
Date In Service 1929
Gun Weight N/A
Gun Length oa 185.3 in (4.707 m)
Bore Length 177.2 in (4.500 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire about 10 rounds per minute


Type Fixed
Weight of Complete Round 53.6 lbs. (24.29 kg)
Projectile Types and Weights HE: 32 lbs. (14.45 kg)
Bursting Charge N/A
Projectile Length N/A
HE Complete Round: 39.4 in (100.1 cm)
Propellant Charge 9.7 lbs. (4.4 kg)
Muzzle Velocity HE: 2,493 fps (760 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 32 lbs. (14.5 kg) HE
Elevation Distance
No information available No information available

Mount/Turret Data

  • Single Mounts
    • Redoubtable (1): SMCA M1925
    • Oil tankers (1): CA M1925
Weight N/A
Elevation -10 / +70 degrees
Rate of Elevation Manual Only
Train about +150 / -150 degrees
Rate of Train Manual Only
Gun Recoil 13.8 in (35 cm)


Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "Navies of the Second World War - The French Navy" by Henri le Masson


  • "The French Navy under Steam" picture essay in "United States Naval Institute Proceedings" Vol. 80, No. 7, July 1954

Page History

25 February 2012
New datapage
01 April 2013
Added gun and ammunition information