MSPO (2-5.09.2025)
33rd International Defence Industry Exhibition MSPO
Changjin ENG Co.,Ltd
- 59, Seokgyesandan 3-gil, Sangbuk-myeon, 50561 Yangsan-si, Gyeongsangnam-do, South Korea
- +821037336909
- namuceo@gmail.com
- cjeng.net
Description
Changjin ENG Co., Ltd. – Precision Engineering for Defense and Industry
Changjin ENG Co., Ltd., established in 2006 and headquartered in Yangsan, South Korea, is a specialized manufacturer of precision mechanical components tailored for military vehicles and industrial machinery. With a primary focus on the defense sector, Changjin ENG has developed a strong reputation as a reliable and flexible engineering partner capable of delivering high-quality parts that meet strict military standards and customer-specific requirements.
The company’s core products include over 200 types of customized components used in engines and transmissions of military vehicles such as the K200 armored personnel carrier, the KM9 engineering vehicle, and the K1 and K55 main battle tanks. These components are manufactured based on detailed technical drawings or physical samples, and are supplied directly to the logistics commands of the Republic of Korea Army, Navy, and Air Force through public tenders and procurement programs.
One of Changjin ENG’s key strengths lies in its ability to conduct more than 80% of its manufacturing processes in-house. Equipped with a wide range of CNC lathes, machining centers, and inspection systems, the company handles nearly all critical stages—including raw material preparation, precision machining, assembly, performance testing, and packaging—under one roof. This vertical integration allows for strict quality control, fast response times, and customized production, even for small-lot, high-mix orders.
In addition, Changjin ENG maintains an extensive network of over 300 subcontracting partners, enabling the company to flexibly scale operations and handle complex, multi-item orders across a wide range of specifications. The company’s technical capacity is backed by more than two decades of accumulated expertise in machining, welding, forming, and assembly.
Changjin ENG has earned a variety of quality certifications, including the Defense Quality Management System (DQMS), ISO 9001, INNOBIZ, and MAINBIZ. The company is also recognized as a specialized enterprise in the field of materials and parts, and operates a certified in-house research and development center. To further enhance productivity and innovation, Changjin ENG has adopted a smart factory system (basic level), laying the foundation for digitalized and data-driven manufacturing.
Driven by its commitment to continuous improvement and customer satisfaction, Changjin ENG is now actively pursuing opportunities to expand its business beyond domestic defense supply and into global markets. The company aims to build strategic partnerships with international defense contractors, government procurement agencies, and industrial clients seeking trusted suppliers of precision components.
Participation in the MSPO 2025 in Poland marks an important milestone in Changjin ENG’s global outreach strategy. Through this event, the company seeks to establish long-term business relationship
Changjin ENG Co., Ltd., established in 2006 and headquartered in Yangsan, South Korea, is a specialized manufacturer of precision mechanical components tailored for military vehicles and industrial machinery. With a primary focus on the defense sector, Changjin ENG has developed a strong reputation as a reliable and flexible engineering partner capable of delivering high-quality parts that meet strict military standards and customer-specific requirements.
The company’s core products include over 200 types of customized components used in engines and transmissions of military vehicles such as the K200 armored personnel carrier, the KM9 engineering vehicle, and the K1 and K55 main battle tanks. These components are manufactured based on detailed technical drawings or physical samples, and are supplied directly to the logistics commands of the Republic of Korea Army, Navy, and Air Force through public tenders and procurement programs.
One of Changjin ENG’s key strengths lies in its ability to conduct more than 80% of its manufacturing processes in-house. Equipped with a wide range of CNC lathes, machining centers, and inspection systems, the company handles nearly all critical stages—including raw material preparation, precision machining, assembly, performance testing, and packaging—under one roof. This vertical integration allows for strict quality control, fast response times, and customized production, even for small-lot, high-mix orders.
In addition, Changjin ENG maintains an extensive network of over 300 subcontracting partners, enabling the company to flexibly scale operations and handle complex, multi-item orders across a wide range of specifications. The company’s technical capacity is backed by more than two decades of accumulated expertise in machining, welding, forming, and assembly.
Changjin ENG has earned a variety of quality certifications, including the Defense Quality Management System (DQMS), ISO 9001, INNOBIZ, and MAINBIZ. The company is also recognized as a specialized enterprise in the field of materials and parts, and operates a certified in-house research and development center. To further enhance productivity and innovation, Changjin ENG has adopted a smart factory system (basic level), laying the foundation for digitalized and data-driven manufacturing.
Driven by its commitment to continuous improvement and customer satisfaction, Changjin ENG is now actively pursuing opportunities to expand its business beyond domestic defense supply and into global markets. The company aims to build strategic partnerships with international defense contractors, government procurement agencies, and industrial clients seeking trusted suppliers of precision components.
Participation in the MSPO 2025 in Poland marks an important milestone in Changjin ENG’s global outreach strategy. Through this event, the company seeks to establish long-term business relationship
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Products
Concentric Valve for air comperssors
Concentric Valve for air comperssors
This concentric valve is a key flow control component in naval air compressors. Its circular multi-slot design regulates intake and discharge flow, optimized for high-pressure, high-speed, repetitive operation.
It features a central fastening bolt and multi-layer disc structure. The disc lifts slightly during intake to open the passage and seals instantly during discharge to prevent backflow. Precision machining and material quality ensure high responsiveness and sealing.
Available in grey cast iron, carbon steel, or stainless steel, it offers corrosion and wear resistance, minimizing deformation over long-term use. The uniform opening pattern stabilizes airflow, boosts efficiency, and reduces noise, ensuring durable, reliable compressor performance in marine environments.
This concentric valve is a key flow control part in naval air compressors, precisely managing intake and discharge flow to optimize performance and efficiency. Its circular multi-slot design ensures uniform airflow, minimal pressure loss, and reliable operation under high-speed, high-pressure, repetitive cycles.
It has a central fastening bolt and multi-layer disc structure. The disc lifts during intake to open the passage and seals instantly during discharge to prevent backflow. Accurate machining, surface finish, and proper materials are essential for fast response and tight sealing.
It can be made in grey cast iron, carbon steel, or stainless steel, and customized for pressures from 10 to 300 bar. All materials are treated for marine environments, resisting corrosion and wear. A uniform opening pattern stabilizes flow, reduces noise, and improves efficiency. Optimized strength and geometry maintain performance over long-term use, ensuring durability, reliability, and efficiency in demanding naval conditions.
It has a central fastening bolt and multi-layer disc structure. The disc lifts during intake to open the passage and seals instantly during discharge to prevent backflow. Accurate machining, surface finish, and proper materials are essential for fast response and tight sealing.
It can be made in grey cast iron, carbon steel, or stainless steel, and customized for pressures from 10 to 300 bar. All materials are treated for marine environments, resisting corrosion and wear. A uniform opening pattern stabilizes flow, reduces noise, and improves efficiency. Optimized strength and geometry maintain performance over long-term use, ensuring durability, reliability, and efficiency in demanding naval conditions.
Cylinder for air compressor
Cylinder for air compressor
This cylinder and piston set is a key component of an air compressor, enabling efficient compression of air. The cylinder guides piston movement and forms the compression chamber, while the piston compresses air inside.
Cooling fins on the cylinder dissipate heat, ensuring stable operation and efficiency. The piston, made from high-strength alloy steel, resists wear and deformation under high pressure. Multiple ring grooves provide sealing, prevent air leakage, and improve lubrication distribution.
Precision machining reduces friction and boosts compression efficiency. Made with corrosion-resistant materials, it ensures long-term durability and reliable performance in demanding marine or industrial environments.
This cylinder and piston set is a key power unit in an air compressor, compressing air efficiently. The cylinder guides piston motion and forms the compression chamber, while the piston compresses air to high pressure. Multiple cooling fins on the cylinder dissipate heat, maintaining stable operation in prolonged high-speed, high-pressure conditions. Made from high-strength alloy steel, the piston resists wear and deformation, with multiple ring grooves ensuring airtight sealing and even lubrication. Precision machining minimizes friction, prevents leakage, and maximizes compression efficiency. Corrosion-resistant materials and surface treatments provide long-term stability in marine and industrial environments. Custom manufacturing is available for size, shape, materials, compression stages, and cooling designs, delivering solutions tailored to customer needs.
Fire Control System Components
Fire Control System Components
This precision worm gear set is a key part of military Fire Control Systems (FCS), enabling smooth, accurate horizontal movement of gun barrels or sensor units. Working with a worm shaft, it converts rotation into controlled lateral positioning for precise target tracking. Made from stainless steel and brass alloy, it offers durability and friction resistance. CNC machining minimizes tooth errors, while the brass housing ensures smooth engagement and reduced wear. Designed for military conditions, it resists moisture, dust, shock, and vibration, ensuring reliable operation. By delivering high positioning accuracy, it boosts FCS performance.
This worm gear drive unit is a key component in military Fire Control Systems (FCS), enabling precise horizontal movement of gun barrels or sensor modules. It consists of a worm shaft, worm wheel, housing, bearings, and sealing/lubrication systems. The mechanism converts rotational motion into high-torque, slow-speed lateral positioning, ensuring accurate target tracking and stable alignment. Made from high-strength stainless steel and brass alloy, it offers durability, low friction, and smooth meshing. CNC machining minimizes tooth profile errors, while brass housing reduces wear. Self-locking prevents reverse motion from recoil or vibration. Sealed construction blocks dust and moisture, and optimized housing stiffness and bearing preload ensure performance in shock, vibration, and temperature extremes. Quality checks on profile accuracy, backlash, runout, and torque guarantee micron-level precision and repeatable positioning in harsh military environments.
connecting rod
connecting rod
The connecting rod is a critical engine component that links the piston to the crankshaft, converting the piston’s reciprocating motion into rotational motion. This product can be manufactured from gray cast iron or other materials specified by the customer, allowing optimal selection based on engine power, speed, and operating environment. Its surfaces are precisely machined to minimize friction losses and ensure stable performance even under high-speed and high-load conditions. Dimensional tolerances are strictly controlled during production, and non-destructive testing (NDT) is performed to detect micro-cracks or defects, ensuring durability and reliability. The design can be customized to meet specific customer requirements, including dimensions, structure, and bearing types, providing an optimal solution for a wide range of engine specifications.
The connecting rod links the piston to the crankshaft, converting reciprocating motion into rotation while transmitting combustion forces. It is made from gray cast iron or customer-specified materials, selected for engine power, speed, and operating conditions. Production involves precision machining for low surface roughness and strict dimensional tolerance control. After machining, non-destructive testing (NDT) detects micro-cracks or internal defects to ensure durability. Each rod is checked for centerline accuracy, weight balance, and surface quality to maintain stability under high speed and load. Functionally, it transfers and absorbs forces and vibrations from combustion, requiring high strength, wear resistance, and balanced weight. Custom designs can be provided for dimensions, geometry, bearing types, and surface finishes, with prototypes tested and refined to meet customer needs, ensuring durability, reliability, and efficiency in marine and industrial engines.
Arm, Extractor
Arm, Extractor
The “Arm, Extractor” is a precision part in naval gun systems, used in 76 mm and 62 mm caliber weapons to remove spent cartridges after firing. Once a round is discharged, the hot, high-pressure cartridge case remains in the breech. The arm, as part of the extractor mechanism, securely grips the rim or groove and, in sync with the gun’s recoil and cycling, pulls the case from the chamber and guides it to ejection.
Built from high-strength metal, it can be customized for material, surface treatment, and dimensions to meet specific operational needs. Corrosion-resistant coatings and wear-resistant alloys enhance performance in harsh marine conditions. Manufactured through precision CNC machining, welding, and finishing, it ensures perfect fit, durability, and reliable function under rapid-fire operations.
The Arm, Extractor is a key component in 76mm and 62mm naval guns, responsible for removing spent cartridges after firing. When a case remains in the chamber under high heat and pressure, it grips the rim or groove and, in sync with the extraction system, pulls it free and guides it to ejection.
Built to endure the harsh environment of naval operations, it can be custom-made in various materials and designs per customer requirements. Special heat treatment enhances wear resistance and minimizes deformation during repeated cycles, while optional coatings improve corrosion protection.
Manufactured through precision CNC machining, dimensional inspection, surface finishing, and assembly, each unit passes strict testing for accuracy, strength, and durability, ensuring consistent performance in high-rate, continuous fire. This reliability makes it essential for maintaining operational safety and readiness.
Built to endure the harsh environment of naval operations, it can be custom-made in various materials and designs per customer requirements. Special heat treatment enhances wear resistance and minimizes deformation during repeated cycles, while optional coatings improve corrosion protection.
Manufactured through precision CNC machining, dimensional inspection, surface finishing, and assembly, each unit passes strict testing for accuracy, strength, and durability, ensuring consistent performance in high-rate, continuous fire. This reliability makes it essential for maintaining operational safety and readiness.
Safety valve for high pressure air compressor
Safety valve for high pressure air compressor
This safety valve for high-pressure air compressors automatically opens to release air when system pressure exceeds 250–300 bar, protecting equipment and operators. When the set pressure is reached, the spring–seat balance breaks, the valve opens, and air is discharged. It closes automatically once pressure returns to safe levels.
Built with a brass housing and stainless steel body, it offers high corrosion and wear resistance for marine and industrial use. The threaded connection allows easy installation and maintenance, and the top adjustment knob enables pressure setting. Design and operating pressure can be customized to meet customer requirements, making it ideal for overpressure prevention and reliable performance.
This safety valve for high-pressure air compressors automatically opens to release compressed air when system pressure exceeds the set range, protecting equipment and operators. Designed to operate at 250–300 bar, it can be customized for both operating pressure and external configuration to meet customer requirements.
Operation: When internal pressure reaches the set value, the spring is compressed beyond its limit, lifting the valve disc and opening the passage. Air is discharged until pressure returns to a safe range, then the disc reseats to seal the flow path.
Construction: The valve has a brass housing for corrosion resistance and sealing, and a stainless steel body for strength and wear resistance under high loads and repeated cycles. A threaded connection allows easy installation and removal, while a top adjustment knob enables precise pressure setting.
Performance: Built for marine and industrial use, it resists corrosion, wear, and deformation under long-term high-pressure operation. Available in various specifications for 10–300 bar, it ensures overpressure prevention, equipment protection, and safe operation in demanding environments.
Operation: When internal pressure reaches the set value, the spring is compressed beyond its limit, lifting the valve disc and opening the passage. Air is discharged until pressure returns to a safe range, then the disc reseats to seal the flow path.
Construction: The valve has a brass housing for corrosion resistance and sealing, and a stainless steel body for strength and wear resistance under high loads and repeated cycles. A threaded connection allows easy installation and removal, while a top adjustment knob enables precise pressure setting.
Performance: Built for marine and industrial use, it resists corrosion, wear, and deformation under long-term high-pressure operation. Available in various specifications for 10–300 bar, it ensures overpressure prevention, equipment protection, and safe operation in demanding environments.
Impeller Shaft
Impeller Shaft
The impeller shaft is a key component that connects the impeller to the drive unit, enabling efficient transmission of rotational power. Built from high-strength alloy or stainless steel, it withstands high-speed rotation and heavy loads while maintaining structural stability. Precision machining and polishing reduce friction and wear, ensuring long-term durability. Both ends are engineered with bearing fits, threads, and keyways for accurate assembly and maintenance. Dynamic balancing ensures stable rotation, and optional special heat treatment enhances surface hardness and fatigue resistance. Custom manufacturing is available to meet specific requirements for length, diameter, and surface treatment, optimizing performance across various pumps, turbines, and rotating machinery.
The impeller shaft is a critical component for transmitting rotational power from the drive unit to the impeller, operating reliably under high-speed and heavy-load conditions. Manufactured from high-strength alloy or stainless steel, it is customized to match the customer’s operational environment and specific requirements. The production process includes precision machining with strict dimensional and geometric tolerance control, ensuring excellent straightness, concentricity, and surface finish. Special heat treatment or thermal spray coating can be applied when needed to enhance hardness, wear resistance, and fatigue strength. Both ends are machined with bearing fits, keyways, and threads for precise assembly, while dynamic balancing minimizes vibration during high-speed rotation. With a strong focus on durability, efficiency, and adaptability, this shaft is engineered to improve overall equipment performance and reduce long-term maintenance costs.
Exhaust Pipe Assembly for Engine
Exhaust Pipe Assembly for Engine
This exhaust pipe assembly is a precision component inside a marine engine turbocharger. Made from stainless steel 316 or stainless steel 321, it offers high resistance to corrosion, oxidation, and heat, ensuring reliable performance in harsh marine conditions. It channels exhaust gases from the turbocharger to the outlet while maintaining optimal back pressure for engine and turbocharger efficiency. Each unit passes strict leak and crack tests to guarantee airtight sealing and structural integrity under extreme pressure and temperature. Precision welding and smooth internal surfaces minimize flow resistance and thermal stress, extending service life. Custom manufacturing is available to meet specific requirements for size, connections, and performance, ensuring compatibility with different engine designs.
This exhaust pipe assembly is a key component inside a marine engine turbocharger, designed to discharge high-temperature, high-pressure exhaust gases efficiently. Made from stainless steel 316 or stainless steel 321, it offers excellent corrosion, oxidation, and heat resistance for harsh marine environments. The flow cross-section and curvature are optimized to minimize exhaust resistance and improve turbocharger responsiveness. The body, flanges, and joints are precision-welded, with welds inspected through penetrant testing (PT) for micro-cracks, and all units undergo strict leak testing to ensure airtight performance under extreme conditions. Structural rigidity and joint design are reinforced to withstand thermal expansion and vibration, with thickness and strength optimized to minimize deformation during repeated operation. All manufacturing follows marine engine standards, and custom fabrication is available for size, shape, and connection type. With its engineering and quality control, this exhaust pipe ensures reliability, efficiency, and durability, contributing to engine performance and service life.
gause rod-cap, liquid
gause rod-cap, liquid
This dipstick is used in the KM9 Armored Combat Dozer to measure oil levels in the engine, transmission, or hydraulic system. The tip has markings such as “LOW,” “FULL,” and “COLD IDLE,” allowing quick visual checks of whether the fluid is within the operating range.
To use, the dipstick is inserted fully into its port and removed to compare the oil trace with the reference lines. Readings vary depending on temperature and operating conditions.
In military equipment like the KM9, rapid and accurate oil checks are vital for reliability in harsh environments. The durable, corrosion-resistant metal construction ensures long service life and maintains shape under repeated use.
This dipstick is used in the KM9 Armored Combat Dozer to measure lubricant levels in the engine, transmission, or hydraulic system. In military equipment, regular fluid checks are vital for proper operation and preventing failures.
The tip has markings such as “LOW,” “FULL,” and “COLD IDLE,” enabling quick visual confirmation of whether the oil is within range. To measure, insert the dipstick fully into its port, remove it, and compare the oil mark with the reference lines. Readings vary with operating or idle states and temperature.
Built for extreme military conditions—vibration, shock, and temperature changes—the dipstick uses high-strength metal with a corrosion-resistant finish to maintain shape after repeated use. Wear- and heat-resistant markings ensure long-term readability.
This tool provides fast, accurate oil status checks, helping extend service life and ensure reliable KM9 operation.
The tip has markings such as “LOW,” “FULL,” and “COLD IDLE,” enabling quick visual confirmation of whether the oil is within range. To measure, insert the dipstick fully into its port, remove it, and compare the oil mark with the reference lines. Readings vary with operating or idle states and temperature.
Built for extreme military conditions—vibration, shock, and temperature changes—the dipstick uses high-strength metal with a corrosion-resistant finish to maintain shape after repeated use. Wear- and heat-resistant markings ensure long-term readability.
This tool provides fast, accurate oil status checks, helping extend service life and ensure reliable KM9 operation.
fillter housing
fillter housing
The oil filter housing for naval engines is a robust component designed to secure and protect the oil filter, ensuring its optimal performance under demanding marine conditions. Constructed from high-strength materials, it maintains a precise seal to prevent oil leakage, even under high pressure and vibration. Its design facilitates efficient oil flow while supporting easy installation and maintenance. The housing not only safeguards the filter element from external damage but also ensures stable operation of the filtration system, contributing to the overall reliability and longevity of the engine.
The oil filter housing for naval engines is engineered to ensure precise and stable positioning of the filter element, allowing uninterrupted oil filtration under extreme marine conditions. It maintains a secure, leak-free seal to prevent pressure loss, ensuring consistent lubrication and engine protection. Its internal geometry is optimized for smooth oil flow, minimizing turbulence and maximizing filtration efficiency. The housing’s robust construction withstands high vibration, temperature fluctuations, and saltwater exposure, while allowing quick filter replacement. This design directly enhances engine reliability, operational readiness, and service life.
stator(Torque converter)
stator(Torque converter)
This transmission stator by Changjin ENG is made through precise machining and assembly. High-strength alloy materials are cut to size, CNC turning shapes the exterior, and a machining center (MCT) creates the blade structure and exact diameters. The spline section is processed with specialized equipment to maintain strict tolerances. After machining, dimensions and shapes are inspected, and surface treatments are applied if needed for wear and corrosion resistance. Bolt holes and spline connections are checked thoroughly, and assembly ensures exact alignment with internal transmission parts. Final functional and simulation tests confirm smooth performance for military and industrial applications.
This component is a critical part of a transmission, installed inside the stator or torque converter to improve power transfer efficiency. In a torque converter, the stator sits between the pump impeller and turbine, controlling hydraulic fluid flow to increase torque at low speeds and reduce losses at high speeds. The central spline connects to the transmission shaft, while angled blades on the outer rim redirect fluid flow, optimized through fluid dynamics to reduce energy loss. Made from high-strength alloy for wear and impact resistance, it is precisely machined via CNC and MCT for blade shapes, diameters, and gear profiles. All parts are inspected within tight tolerances, with surface treatments applied when needed for corrosion resistance. During assembly, it combines with bearings and a one-way clutch, enabling torque multiplication at low speeds and free rotation at high speeds. It is tested for durability, hydraulic performance, and high-speed operation to ensure reliability in military and industrial transmissions, even in extreme environments.
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Armoured equipment
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Naval armament and equipment
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