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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 4 – Section 3 |
| ARMY MORTARS |
| Type 2 - 120-mm High-Explosive Mortar |
| Weight complete round: 26.5 pounds. |
| Weight main charge: 6.0 pounds. |
| Explosive components: |
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Main charge: TNT. |
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Booster: RDX and wax. |
| Over-all length (without fuze): 22.5 inches. |
| Length fin assembly: 6.2 inches. |
| Maximum diameter at bourrelet: 4.7 inches (120 mm). |
| Maximum diameter of tail fins: 4.7 inches. |
| Color: Black over all with a red tip and a yellow band forward of the bourrelet. |
| Fuzing: Type 100 instantaneous short delay mortar fuze. |
| Weapons in which used: Type 2, 120-mm mortar. |
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Description: The body section of this shell is similar to that of the standard Army finned mortar types but the tail fins section resembles that of the Navy 81-mm H.E. The 12 fins are welded to the propellant tube which is welded to the base of the body. The forward end of the tube has 43 escape ports arranged in 6 rows to allow the flash to pass from the primary cartridge to the propellant increments. The initial charge is contained in a cardboard case which fits inside the propellant tube and is held in place by a steel plug fitted with the primer cap. The main propelling charge is contained in 6 doughnut shaped silk bags which are split so that they can be slipped around the propellant tube above the tail fins and over the flash ports. |
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Remarks: A variation of this shell has been found with the tail section threaded into the body and secured by a pin instead of being welded to the body. |
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Figure 311 – Type 2 120-mm High-Explosive Mortar. |
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