Extended Range High Explosive is ST Engineering's Singapore-made 120 mm extended-range high-explosive mortar bomb for smoothbore mortar systems. Janes placed ER HE in the SRAMS Mk II ammunition suite, while ST Engineering's ER mortar-bomb material supports a 650 m to 9 km range, 14.8 kg round weight, 2.8 kg TNT filling, DM111A4/A5 fuze, and compatibility with vehicle-mounted smoothbore mortars.
Public ST Engineering and Janes material place ER HE inside a broader 120 mm smooth-bore/SRAMS ammunition family with precision-guided, smoke, and illuminating siblings.
| Variant | Configuration | Designation notes |
|---|---|---|
 | 120 mm GPS-guided precision mortar bomb | Janes names PM120 in the same SRAMS Mk II ammunition suite; it differs from ER HE by adding GPS guidance and precision-mortar-bomb role. Sources: IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II |
| 120 mm extended-range smoke mortar round | Janes names ER Infra-Red Red Phosphorous alongside ER HE in the SRAMS Mk II ammunition suite, and ST Engineering's ER mortar-bomb table lists the IR RP smoke variant beside ER HE. Sources: IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II, 120mm Extended Range Mortar Specifications |
| ER Illuminating | 120 mm illuminating mortar round | Janes and ST Engineering's ER mortar-bomb table list an ER Illuminating round in the same extended-range family, but no separate catalog record is linked here. Sources: IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II, 120mm Extended Range Mortar Specifications |
Janes names Extended Range High Explosive in ST Engineering's SRAMS Mk II ammunition suite, and ST Engineering says its 120 mm extended-range mortar bombs are compatible with smooth-bore mortar systems, including vehicle-mounted systems.
| Compatible item | Item type | Compatibility evidence |
|---|---|---|
 | Wheeled self-propelled 120 mm mortar carrier | The Agrab is a vehicle-mounted SRAMS mortar carrier, and Janes places ER HE in ST Engineering's SRAMS Mk II ammunition suite for smoothbore mortar systems. Sources: IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II, Agrab mobile mortar overview |
 | Vehicle-mounted 81 mm and 120 mm mortar system | The GDAMS brochure lists 120 mm qualified ammunition compatibility, while Janes identifies ER HE as part of ST Engineering's SRAMS Mk II 120 mm ammunition suite. Sources: GDAMS brochure, IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II |
ER HE is documented as one round in ST Engineering's 120 mm extended-range mortar-bomb family. The public sources used here support product identity, technical data, and launcher compatibility rather than independent named-conflict use of the exact round.
High-explosive extended-range round listed beside precision-guided, infrared red-phosphorus smoke, and illuminating 120 mm mortar bombs.
Designed for smooth-bore mortar systems, including vehicle-mounted systems; catalog links use documented SRAMS, Agrab, and GDAMS compatibility rather than copying launcher conflict records onto the ammunition.
Available public product and reference sources identify ER HE and compatible systems, but do not directly document ER HE itself in a named armed conflict.
Sources: IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II; 120mm Extended Range Mortar Specifications; Mortar Bombs; 120mm Super Rapid Advanced Mortar System (SRAMS); GDAMS brochure; Agrab mobile mortar overview.
Janes reported ST Engineering's SRAMS 120 mm Mk II launch and named Extended Range High Explosive among the new ammunition-suite designations.
Sources: IDEX 2018: Singapore's ST Engineering launches SRAMS 120 mm Mk II
ST Engineering's SRAMS brochure lists the 120 mm ER HE round with 14.8 kg mass, 807 mm length, 2.8 kg TNT filling, DM111A4/A5 fuze, 408 m/s muzzle velocity, and 650 m to 9 km operating range.
Sources: 120mm Extended Range Mortar Specifications
