Yujin Machinery

What Yujin Machinery does

Yujin Machinery (유진기공산업) is a privately held South Korean industrial manufacturer founded in 1972 and headquartered in Ansan, Gyeonggi-do. The company operates two distinct business divisions. The Railway Vehicle Division produces five core safety-critical components — brake systems, couplers, pantographs, driving gears, and door systems — for KTX, EMUs, high-speed trains, maglev, LRVs, and electric locomotives, with key customers including KORAIL, Hyundai Rotem, and municipal transit operators such as Busan Transportation Corporation and Gwangju Metropolitan Subway. The Industrial Compressor Division, marketed under the MICOS brand, manufactures a full portfolio of oil-free screw, oil-injected screw, and scroll compressors ranging from 5.5 kW to 450 kW, complemented by air-treatment systems (refrigerated and desiccant dryers, after coolers, filters) and the MICOS-III/IV Ethernet-based group control platform.

The company's revenue mechanics are hardware-driven B2B sales: industrial equipment is sold through a hybrid model combining direct enterprise field sales and a 24-distributor authorized network covering all major Korean provinces, plus export sales through overseas distributors and a wholly-owned Suzhou, China manufacturing subsidiary established in 2009. Aftermarket service, spare parts, and maintenance are recurring revenue streams delivered through the distributor channel and a dedicated 146-employee maintenance subsidiary (Yujin Rollingstock). Yujin monetizes its technology position via proprietary assets including a first-of-its-kind-in-Korea oil-free screw compressor architecture, a patented 5×6 profile airend with international PCT and US patent coverage, and VSD inverter control technology that delivers up to 30% energy savings versus fixed-speed units.

Yujin serves a diversified enterprise customer base across railway operators, automotive (Hyundai Motor), steel (POSCO, Hyundai Steel), electronics and semiconductors (Samsung Electronics, LG Electronics), heavy industry and shipbuilding (Hyundai Heavy Industries, Doosan Heavy Industries), construction (Samsung Engineering), and power generation (Korea Southern Power). The group structure consists of the parent plus four wholly-owned subsidiaries: Yujin Electric (1994), Yujin Rollingstock (2000), Jeil Rollingstock (2005), and Suzhou Yujin Air Compressor (2009). The company is privately held with no disclosed external funding, parent company, or public listing, and is described in its own materials as "Korea's largest railway vehicle components specialist."

Name

Yujin Machinery

Legal name

유진기공산업 주식회사

Website

https://yujinltd.co.kr

Company type

Private

Founded year

1972

Operating status

Operating

Headcount range

51–100 employees

Short description

Yujin Machinery is a Korean manufacturer of railway vehicle components (brake systems, couplers, pantographs, driving gears, door systems) and MICOS-branded industrial compressors (oil-free and oil-injected screw, scroll), serving KORAIL, Hyundai Rotem, and major Korean industrial conglomerates, with four wholly-owned subsidiaries including a Chinese manufacturing operation.

Ownership category

akta.pro rank

Product category

Railway Vehicle Components & Industrial Compressors

NAICS

Air and Gas Compressor Manufacturing (333912), Pump and Compressor Manufacturing (33391)

SIC

Railroad Equipment (3743), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564)

akta.pro primary industry

Air & Gas Compressors (General Purpose) (IMAHANAE)

akta.pro secondary industries

Process Gas & High-Pressure Compressors (IMAHANAF), Pump & Compressor Packages (Skids, Booster Sets) (IMAHANAG), Compressors, Refrigeration Components & Condensing Units (IMADANAG), Hydraulic Brake Systems (Master Cylinders/Calipers/Lines/Boosters) (IMACAIAD)

Keywords

• Railway vehicle components
• Industrial air compressors
• Oil-free screw compressors
• Brake systems
• Scroll compressors

Headquarters

HQ city

Ansan

HQ country

South Korea

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Technology or R&D, Supply Chain, Marketing or Sales, Infrastructure

Revenue model

1. Railway Vehicle Components: Manufacturing and sales of railway vehicle components including brake systems, couplers, pantographs, driving gears, and door systems for LRV, maglev trains, trams, EMUs, high-speed trains, and electric locomotives.
2. Industrial Compressors: Sales of oil-free screw compressors, oil-injected screw compressors (belt-driven and direct-driven), VSD inverter compressors, and scroll compressors ranging from 5.5kW to 450kW.
3. Air Treatment Systems: Sales of refrigerated air dryers, desiccant air dryers, after coolers, and air filters for compressed air treatment and purification.
4. Compressed Air Solutions Control Systems: MICOS-III and MICOS-IV controller systems and Air Solution integrated control systems for managing multiple compressor installations.
5. Aftermarket Services: After-sales service, spare parts, and maintenance support through regional distributor network and headquarters service team.

Go-to-market motion3 records

Distribution channels4 records

Marketing channels5 records

Core offering

Yujin Machinery manufactures and supplies railway vehicle components — brake systems, couplers, pantographs, driving gears, and door systems — for KTX, EMUs, maglev trains, trams, and high-speed trains. The company also manufactures industrial compressors under the MICOS brand, including oil-free screw, oil-injected screw (belt-driven and direct-driven), VSD inverter, and oil-free scroll compressors ranging from 5.5kW to 450kW, complemented by air treatment systems and integrated control solutions.

Product overview

Yujin Machinery operates two main business divisions: Railway Vehicle Division and Industrial Compressor Division. The Railway Vehicle Division produces five core components: Brake System, Coupler, Driving Gear, Pantograph, and Door System for various train types including KTX, EMUs, maglev, trams, and high-speed trains. The Industrial Compressor Division (MICOS brand) offers a comprehensive portfolio of oil-free and oil-injection screw compressors and scroll compressors across three drive types (Belt-driven 5.5-22kW, Direct-driven 15-450kW, VSD Inverter 22-315kW), complemented by a complete air treatment system portfolio including refrigerated and desiccant air dryers, after coolers, and precision air filters. The product ecosystem is unified through the Air Solution group control system (MICOS-III/IV) with ModBus connectivity, and supported by the Air Demand Analysis Tool for system optimization.

Differentiator

Problem solved

Functional benefit

Brands

• MICOS: Industrial compressor brand featuring oil injection screw compressors, oil-free screw compressors, and oil-free scroll compressors under the MICOS Series (5.5 ~ 450kW)
• MICOS-AIR COMPRESSOR

Products and services

• Brake System Railway vehicle brake system components including brake control equipment and bogie brake systems for KTX, EMUs, LRVs, maglev trains, trams, and high-speed electric locomotives.
• Coupler Railway vehicle coupler system for connecting train cars, including coupler with high-capacity energy absorber meeting TSI standards.
• Driving Gear Railway vehicle driving gear unit for power transmission in various train configurations including Busan and Daegu subway lines.
• Pantograph Railway vehicle pantograph for power collection from overhead lines, including collector strips supplied to Busan subway lines.
• Door System Railway vehicle door control system for passenger safety and operations across various train types.
• Oil Free Screw Compressor (Micos 55F~260F) Nation's first domestically localized oil-free screw compressor producing clean compressed air for food, pharmaceutical, semiconductor, printing, chemical, precision coating, and golf industries. Features 2-stage compression, gear-driven system, available in air-cooled and water-cooled variants with power range 55-260kW.
• Oil Free Screw Compressor VSD (Micos 55Fv~260Fv) Variable speed drive version of oil-free screw compressor with soft start by inverter. Features variable capacity control ranging from 5.0 to 43.0 m3/min at 7 bar with power range 55-260kW.
• Oil Free Scroll Compressor (Micos 3S-L~37S-L) Oil-free scroll compressor producing super-clean compressed air for food, machinery, semiconductor, printing, chemical, and precision coating industries. Features 6.0-8.0 bar working pressure, power range 3.7-37kW, and low noise levels (50-65 dB).
• Belt-Driven Screw Compressor (Micos 5~22) Small-sized oil injection screw compressor with belt-driven system for small and medium industrial applications. Power range 5.5-22kW with YDA-3 module air end technique.
• Direct-Driven Screw Compressor (Micos 15~450) Direct-coupled screw compressor eliminating belt transmission loss. First direct drive compressor developed in Korea. Available in 15-450kW range with 5x6 profile airend for high efficiency at low speed; reduces operational costs by 15% compared to belt drive.
• VSD Inverter Screw Compressor (Micos 22V~300V) Variable speed drive compressor that adjusts motor rotation speed to match actual compressed air demand. Provides up to 30% energy savings by eliminating unload operation and frequent restart. Power range 22-315kW.
• Refrigerated Air Dryer (YD Series) Refrigerated air dryer for moisture removal from compressed air. YD Series ranges from 5-2000 model with flow capacity 0.51-267 m3/min, featuring pressure dew point of 10°C.
• Desiccant Air Dryer (YAD/YHP/YOM Series) Desiccant air dryers including heatless (YAD), heater external (YHP), and oilless master (YOM) variants for achieving dew points from -40°C to -70°C.
• After Coolers (YC Series) Heat exchanger-based after coolers for rapid temperature reduction of compressed air. YC Series ranges from YC-10 to YC-1200 with fan diameters up to 500mm.
• Air Filters (YF Series) Compressed air filtration systems including main, pre, line, coalescent, and adsorbent filters with filtration from 40um down to 0.001ppm oil removal.
• Air Solution Group Control System (MICOS-III / MICOS-IV) Ethernet-based integrated compressor control system (MICOS-III / MICOS-IV) for managing multiple compressors and air treatment systems. Features ModBus LAN connectivity, remote monitoring, SMS alerts, and internet web system control.

Quantifiable outcome

• Energy savings up to 30% with VSD inverter compressors compared to fixed-speed units
• +3 more outcomes

Named customers14 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

One partnership is on record.

• Suzhou Yujin Air Compressor Ltd. (苏州裕镇空压机有限公司)coreOthers · 1 January 2009Wholly-owned overseas subsidiary established in Suzhou, China in 2009 for local manufacturing and sales of MICOS series compressors. Serves as the company's manufacturing base and distribution hub for the Chinese market.

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Kaeser Kompressoren: German manufacturer of rotary screw, oil-free, and VSD compressors. A relevant global peer to Yujin's compressor division, particularly in the energy-efficient and oil-free segments where Yujin holds Korean patents and competing product lines.
• Atlas Copco: Global leader in industrial compressors with deep oil-free screw, scroll, and VSD portfolios. Directly comparable to Yujin's MICOS compressor division as the dominant Western incumbent against which Yujin competes on price, energy efficiency, and service in Korea and emerging markets.
• Kobe Steel (Kobelco): Japanese industrial conglomerate with a long-standing oil-free screw compressor franchise historically dominating the Korean market that Yujin has localized against. A direct comparable for Yujin's oil-free screw technology and end markets.
• Hitachi Industrial Equipment Systems: Japanese manufacturer of oil-injected screw compressors and related industrial equipment. Comparable to Yujin's MICOS compressor line on product type, customer segment, and Asian regional distribution.
• Ingersoll Rand: Major global compressor manufacturer offering oil-injected, oil-free, and VSD screw compressors. Competes head-to-head with Yujin's MICOS product lines in industrial applications and serves overlapping customer segments (automotive, steel, electronics).
• Sullair: Established oil-injected and oil-free screw compressor manufacturer with global distribution. Closely comparable to Yujin's direct-driven and oil-free screw compressor offerings and competes in the same industrial end markets.

Emerging players

• Elgi Equipments: Indian compressor manufacturer rapidly expanding its oil-free and screw compressor portfolio globally. An emerging peer in the same product categories as Yujin's MICOS line, particularly relevant in cost-sensitive export markets.

Direct peers

• Dawonsys: Korean supplier of railway propulsion, brake, and electric systems for trains and urban transit. A direct peer in Yujin's railway vehicle component segment with overlapping customer base (KORAIL and municipal subway operators).
• Woojin Industrial Systems: Korean manufacturer of railway vehicle components including brake systems, couplers, and pantographs. The closest direct peer to Yujin's railway division, competing for the same KORAIL and urban subway business in Korea.
• LS Mtron: Korean industrial group with railway vehicle components and industrial automation businesses. Comparable to Yujin's combined railway-component and industrial-equipment profile, serving similar Korean conglomerates and transit customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/watch?v=UCjjXK0SNxY
• LinkedInlinkedin.com/company/yujin-machinery-ltd

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Yujin Machinery