12-cm (120-mm) (4.7-Inch) High-Explosive (Ordinary Mk 3)12-cm (120-mm) (4.7-Inch) High-Explosive (Ordinary Mk 4)
Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition
Chapter 5 - Section 1
NAVY PROJECTILES
12-cm (120-mm) (4.7-Inch) High-Explosive (Ordinary Mk 3 Mod 1)
Weight of filled projectile (without fuze): 44.75 pounds.
Weight of projectile, empty: 41.14 pounds.

Weight stamped on rotating band (sample): 18.520 kg. (varies with individual projecti-les).

Length of projectile (without fuze or adapter): 14.1 inches.
Diameter at bourrelet: 4.7 inches (119.5 mm).
Distance from base to rotating band: 0.78 inch.
Width of rotating band: 1.95 inches.
Radius of ogive: 4 cal.
Filling: Cast picric acid (shimose) 3.61 pounds.

The charge consists of two blocks of explosive cast and sealed in a waxed paper contai-ner, encased in a heavy cotton-flannel bag and sealed in the projectile with paraffin.

Fuzing:

a. Width adapter: Type 5-year point detonating fuze.

b. Without adapter: Type 88 point detonating fuze.

This projectile cannot be fuzed with standard mechanical time fuze for A.A. use because it will not accomomodate the auxiliary gaine used with these fuzes.

Weapons in which used:
British type 12-cm/40 gun (low angle).
Type 3-year 12-cm/45 gun (low angle).
Type 11-year 12-cm/45 gun (low angle).

Figure 386 – 12-cm High-Explosive (Ordinary Mk 3 Mod 1).

 
12-cm (120-mm) (4.7-Inch) High-Explosive (Ordinary Mk 3)12-cm (120-mm) (4.7-Inch) High-Explosive (Ordinary Mk 4)