Spain Moves to Produce South Korea’s K9-Based Howitzers with Integrated Spanish Systems.

Spain signed a binding deal with Indra and Hanwha to co-develop K9-based self-propelled artillery in Madrid. The move strengthens domestic control over artillery production and long-term sustainment.

The March 24 agreement focuses on adapting South Korea’s K9 Thunder tracked howitzer to Spanish Army requirements, while shifting integration and manufacturing into Spain. The program is expected to replace legacy artillery systems and expand the national defense industrial base. Indra will likely lead system integration, digital architecture, and command systems, while Hanwha contributes the proven K9 platform, already fielded by multiple NATO and partner nations.
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The K9 Thunder provides the central firepower element. Its 155 mm 52-caliber gun engages targets at ranges of around 30 kilometers with standard high-explosive ammunition and up to 40 kilometers using rocket-assisted projectiles. (Picture source: Army Recognition)

The agreement defines a broad operational and industrial scope. It covers the delivery of 128 tracked artillery vehicles, supported by 120 ammunition resupply vehicles, 11 command-and-control vehicles and 21 recovery vehicles, all integrated into a wider Special Modernization Program. Indra confirms that the initiative includes a €130 million investment to expand domestic industrial capacity, notably through upgrades to its Gijón facility and the construction of a new integration site. This effort is expected to generate several hundred jobs while reinforcing Spain’s position within European defense industrial networks.

At the industrial level, responsibilities are distributed but closely coordinated. Hanwha Aerospace contributes its K9 Thunder artillery system, a tracked self-propelled howitzer already fielded by multiple NATO members, including Poland, Norway and Finland. Indra manufactures the hulls in Spain and integrates mission systems, battlefield management architecture, communications suites and situational awareness technologies. This arrangement allows Spain to retain control over core digital systems while relying on a combat-proven artillery design.

The K9 Thunder provides the central firepower element. Its 155 mm 52-caliber gun engages targets at ranges of around 30 kilometers with standard high-explosive ammunition and up to 40 kilometers using rocket-assisted projectiles. The system carries 48 rounds onboard and uses an automatic loading mechanism for projectiles, while propellant charges are handled manually. This configuration enables a maximum rate of fire of six rounds per minute and supports multiple-round simultaneous-impact firing, where three rounds can be launched in under 15 seconds along different trajectories to strike the target at the same moment. After receiving a fire order, the system can open fire within 30 seconds when already deployed, or within 60 seconds when transitioning from movement.

Powered by an MTU MT 881 Ka-500 diesel engine delivering 1,000 horsepower and coupled with an Allison X1100-5A3 automatic transmission, the vehicle reaches speeds of up to 67 kilometers per hour with an operational range of approximately 360 kilometers. Its hydropneumatic suspension, with six road wheels per side, provides stability during firing and improved cross-country performance. The overall weight of about 46 tons places it in the same category as modern tracked combat vehicles, ensuring it can operate alongside mechanized formations.

Protection and survivability are tailored to artillery missions in contested environments. The welded steel hull and turret provide resistance against small arms fire and shell fragments, while integrated nuclear biological chemical protection systems allow operations in contaminated conditions. A 12.7 mm M2 heavy machine gun mounted on the turret offers close-in defense against infantry threats and low-flying aerial targets. In addition, onboard fire suppression systems and internal communications networks support crew safety and coordination under combat stress.

Indra’s role reshapes how the system is employed on the battlefield. The integration of advanced command, control, communications, computers and intelligence architecture enables real-time coordination between firing units, reconnaissance assets and higher command echelons. Digital fire control systems compute firing solutions rapidly, reducing engagement times and improving accuracy. The inclusion of systems such as azimuth positioning and automated gun laying further enhances precision while limiting crew workload.

From a tactical perspective, the system is designed for high-tempo operations. Its ability to deliver rapid salvos and relocate immediately supports shoot-and-scoot tactics, reducing vulnerability to counter-battery fire. Networked connectivity allows artillery units to receive targeting data from drones, forward observers or radar systems, then translate that information into fire missions within seconds. If integrated effectively, this shortens the sensor-to-shooter cycle and increases responsiveness across the battlespace. Automation and reduced crew demands also improve endurance, allowing units to sustain operations over extended periods with a smaller logistical footprint.

This program reflects a broader European shift toward combining foreign technology with domestic system integration. By maintaining control over mission systems and production, Spain reduces dependency while preserving flexibility for future upgrades. The approach aligns with similar initiatives across NATO, where standardized artillery systems are adapted to national operational concepts.

As European countries reassess their artillery capabilities in response to evolving security conditions, particularly following high-intensity conflict scenarios observed in Eastern Europe, demand for long-range and mobile fire systems continues to rise. Spain’s investment in a domestically integrated K9-based solution positions it as both an operator and a contributor to future European defense frameworks. At the same time, the growing presence of South Korean defense industry within NATO markets highlights a diversification of supply chains, reshaping traditional procurement dynamics and reinforcing the role of industrial partnerships in shaping collective security.

Written By Erwan Halna du Fretay - Defense Analyst, Army Recognition Group
Erwan Halna du Fretay holds a Master’s degree in International Relations and has experience studying conflicts and global arms transfers. His research interests lie in security and strategic studies, particularly the dynamics of the defense industry, the evolution of military technologies, and the strategic transformation of armed forces.