
The bomb body is black or olive drab. The tail is an unpainted tin color.
The bomb body consists of a 1/8 inch thick steel tube welded longitudinally and closed at the forward end by a 3/4 inch thick nose plug which is welded in place. A cylindrical wooden block is fitted part way into the aft end of the body and secured by six countersunk wood screws. The block contains the simple impact fuze and spring loaded safety pin and also acts as the connecting element between the body and the tail. Two 3/8 inch vent holes are drilled longitudinally through the block 180° apart. The fuze is 2 7/8 inches long and has a 1 3/16 inch diameter. The tubular aluminum body contains a striker and a creep spring. A solid threaded plug closes the aft end and a plug containing the primer screws into the forward end. A spring loaded safety pin holds the striker in position. The incendiary filling in the bomb body consists of a first fire charge which is adjacent to the primer and a main charge below it.
The tail, consisting of a tinned sheet steel tube closed at the after end, is secured to the wooden block by five wood screws. The tail and body sections rest flush against one another, completely concealing the wooden block to which they are attached. A slot in the tail receives the brass safety pin housing which is contained in the wooden block.
The first fire charge is a compressed black powder composed of magnesium, barium peroxide and potassium nitrate. The main charge is thermite.
General Information, Japanese Army Bombs