12-cm/Short (120-mm) (4.7-Inch) Complete Round (Fixed)12-cm (120-mm) (4.7-Inch) Complete Round (Semifixed)
Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition
Chapter 5 - Section 1
NAVY PROJECTILES
12-cm/Short (120-mm) (4.7-Inch) High-Explosive
Assembled round:
Weight of complete round: No data.
Length of complete round (with type 0 fuze): 24.8 inches.
Projectile:
Weight of filled projectile (without fuze): 26.0 pounds.
Weight of projectile, empty: 20.5 pounds.

Weight stamped on rotating band (sample): 9.340 kg. (varies with individual projectiles).

Dimensions:
Length of projectile (without fuze): 12.6 inches.
Diameter at bourrelet: 4.7 inches (119.5 mm).
Distance from base to rotating band: 1.5 inches.
Width of rotating band: 1.0 inches.
Radius of ogive: No data.
Filling:
Trinitroanisole (type 91 explosive): 5.5 pounds.

The charge consists of a single block of explosive cast and sealed in waxed paper con-tainer, encased in a heavy cotton flannel bag and sealed in the projectile with paraffin.

Fuzing:
Type 0 mechanical time fuze (red-nosed) for A.A. use.
Type 88 Model 4 point detonating fuze.
Weapon in which used: Short 12-cm gun.

Remarks: The extremely thin wall of this projectile is possible only by virtue of the low muzzle velocity of the howitzer-like weapon. The high charge/weight ratio is intended for effectivencess in use as an underwater charge against submarines, though the projectile may also be time-fuzed for anti-aircraft use.

Figure 383 – 12-cm Short High-Explosive.

12-cm/Short (120-mm) (4.7-Inch) Complete Round (Fixed)12-cm (120-mm) (4.7-Inch) Complete Round (Semifixed)