Primus SSPH 1

Singapore's tracked 155 mm self-propelled howitzer, built by ST Engineering on a locally developed chassis with an automated ammunition-handling system that reduces crew size while maintaining a high rate of fire.

In service since 2004 · 1 operator countries

Compiled from public sources ·primary reference ↗ ·last verified 2026-07-02

km/h

350

km range

155

mm gun

27,000

Procurement snapshot

Availability & export

National export licensing

Subject to Singapore export-control approval; verify eligibility with the manufacturer.

Channel: Direct commercial / G2G

Fielded & proven

Limited · 1 operator

In service since 2004. Status: active · ~18 built.

Lifecycle cost (est.)

No public unit price to model from.

Interoperability

155 mm NATO artillery

Derived guidance from public data — export regime by country of origin, lifecycle from the GAO ~30% acquisition rule. Verify eligibility, pricing and offsets with the manufacturer and your acquisition authority.

Full specifications

Performance

Speed, range, altitude and engagement capability.

Max speed Maximum level speed. For aircraft this is at optimal altitude; for ground vehicles, top road speed. Higher means faster response and better kinematic performance.: 55 km/h

Bottom 8% of artillery systems
Range Maximum distance: ferry range for aircraft, operational range for vehicles, maximum engagement distance for missiles. Higher means more standoff or persistence.: 350 km

Stronger than 16% of artillery systems
Rate of fire Rounds per minute (cyclic). Higher increases suppression and hit probability.: 6 rpm

Stronger than 53% of artillery systems

Firepower

Armament, payload and guidance.

Main armament Primary weapon: main gun, cannon or missile type.: 155 mm/39 howitzer
Caliber Bore diameter of the main gun or rifle. Larger throws heavier projectiles; not simply better — ammunition commonality matters.: 155 mm
Ammunition Rounds carried (main gun) or standard magazine capacity.: 22

Stronger than 43% of artillery systems
Max firing range Maximum range of the main gun or rocket artillery (with assisted/extended-range munitions where noted). Higher extends reach.: 30 km

Stronger than 29% of artillery systems

Physical

Dimensions, weight and crew.

Combat weight Fully loaded weight. Lighter eases transport and bridging limits; heavier often means more armor.: 27,000 kg
Crew Personnel required to operate. Fewer reduces exposure; autoloaders trade a loader for mechanical complexity.: 4

Propulsion

Engine, power and fuel.

Engine Powerplant model and type.: MTU diesel
Engine power Engine output power. Higher moves more weight faster.: 470 hp

Stronger than 14% of artillery systems
Propulsion type Turbofan, turboshaft, diesel, gas turbine, solid-fuel rocket, ramjet…: Diesel (tracked)

Program

Cost, production scale and operators.

Units built Total production run. Higher means proven manufacturing, mature logistics and spares availability.: 18

Bottom 2% of artillery systems
Operator countries Number of countries operating the system. More operators means broader support ecosystem.: 1

Stronger than 17% of artillery systems

Specifications compiled from public ST Engineering Land Systems and reference sources ↗. Published defense figures are approximations — treat comparisons as directional. Last verified 2026-07-02.

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