Type 97 15-kg. Concrete BombType 1 30-kg. Substitute Bomb
Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines, Grenades, Firing Devices
and Sabotage Devices
Chapter 1 – Section 1
Japanese Army Bombs
Type 94 10-kg. Substitute Bomb

Fuzes: A-2 (b).

Over-all length: 27 1/2 inches.

Length of body: 18 1/4 inches.

Diameter of body: 4 1/8 inches.

Thickness of wall: 1 inch (approximate).

Material of wall: Concrete.

Type of suspension: Horizontal.

Suspension lug: Normal Army hinged lug.

Color and markings: Black over-all with a red band on nose. Markings in white: weight, place, and date of manufacture.

Length of tail: 9 1/4 inches.

Width of tail: 5 1/2 inches.

Width of tail fins: 2 3/8 inches.

Dimensions of tail struts: Length, 3 1/2 inches; width, 1/4 inch; thickness, 1/16 inch.

Material of tail: Sheet steel.

Type of filling: Central steel tube filled with black powder.

Weight of filling: 1.2 pound.

Total weight of bomb: 22 pounds.

Construction of body: The bomb consists of a thick concrete case surrounding a steel central tube. The tube is filled with loose black powder. It is threaded internally at both ends. A steel well containing a nose fuze pocket threads into the forward end of the tube. A brass disk is placed between the fuze and the black powder. The after end of the tube is closed by a male base plate. A length of pipe is attached to the base plate by four screws.

Construction of tail: Four tail fins are welded to the pipe extending from the base plate. Four single struts support the fins.

Figure 22 - Type 94 10-kg. Substitute Bomb.

Type 97 15-kg. Concrete BombType 1 30-kg. Substitute Bomb