Hydraulics International

What Hydraulics International does

Hydraulics International, Inc. (HII) is a Chatsworth, California-based, privately held manufacturer founded in 1976 that designs and produces mission-critical hydraulic, pneumatic, and electro-mechanical systems for aerospace, defense, and industrial markets. The company operates through three divisions: Military & Commercial AGSE (aerospace ground support equipment, including hydraulic test systems, ammunition loaders, and fluid servicing units), Pumps (high-pressure liquid pumps, gas boosters up to 60,000 PSI, and air amplifiers for oil and gas, hydrogen, fire, mining, and diving applications), and Flowmetrics (turbine flow meters and flow computers for aerospace, pharmaceutical, and energy sectors). Its vertically integrated 800,000 sq. ft. manufacturing footprint includes CNC lathes and mills, computerized tube bending, laser and waterjet cutting, and laser topography scanners, with approximately 85% of products produced internally.

The company sells primarily through direct enterprise sales relationships to U.S. and allied defense forces (US Navy, US Air Force), aerospace prime contractors (Lockheed Martin, Northrop Grumman, Boeing, BAE Systems, Raytheon), government agencies (NASA, DLA), commercial airlines (Air Canada, American Airlines, British Airways, Qantas), and industrial customers. Revenue is generated through hardware sales of high-value equipment, supplemented by aftermarket support including spare parts (over 1,200 components in stock), overhaul and upgrade services, and training/certification courses. The company maintains AS9100, ISO 9001, CE, ATEX, and ASME certifications, and holds 45+ year relationships with major U.S. military branches and 40+ year relationships with international allied militaries, creating deep incumbency on flight-critical platforms such as the F-35 and V-22 Osprey.

In February 2026, Arcline Investment Management entered into a definitive agreement to acquire HII, marking a transition from independent private ownership to a private equity-backed platform with stated growth-oriented expansion plans in engineered systems and specialized pump technologies.

Name

Hydraulics International

Legal name

Hydraulics International, Inc.

Website

https://www.hiigroup.com/home.asp

Company type

Private

Founded year

1976

Operating status

Operating

Headcount range

101–250 employees

Short description

Hydraulics International is a Chatsworth, CA-based manufacturer of mission-critical hydraulic, pneumatic, and electro-mechanical ground support equipment, high-pressure pumps, and flow measurement systems serving U.S. and allied defense forces, aerospace primes, and industrial customers globally since 1976.

Ownership category

akta.pro rank

Product category

Aerospace Ground Support Equipment

NAICS

Fluid Power Pump and Motor Manufacturing (333996), Fluid Power Cylinder and Actuator Manufacturing (333995), Pump and Compressor Manufacturing (33391), Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (334513), Measuring, Dispensing, and Other Pumping Equipment Manufacturing (333914)

SIC

Pumps & Pumping Equipment (3561), Aircraft Parts & Auxiliary Equipment, Nec (3728), General Industrial Machinery & Equipment (3560)

akta.pro primary industry

Hydraulic Power Units & Systems (HPUs, Manifolds, Integrated Circuits) (IMAHAGAB)

akta.pro secondary industries

Military Aerospace Fuel, Hydraulic & Environmental Control Systems (IMABAMAJ), Hydraulic Components (Pumps, Motors, Cylinders) (IMAHAGAA), Hydraulic, Pneumatic & Fluid Power Systems MRO (Cylinders, Pumps, Valves, Hoses) (TLAKAHAI)

Keywords

• Military ground support equipment
• Aerospace ground support equipment
• High pressure pumps
• Flow measurement systems
• Hydraulic test equipment

Headquarters

HQ city

Chatsworth

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Ground Support Equipment Sales: Design, engineering, manufacturing, and aftermarket support of high-value military and commercial aviation ground support equipment including hydraulic test systems, fluid servicing units, and ammunition loading systems. Revenue generated through direct equipment sales to defense forces, prime contractors, and commercial aviation customers.
2. Pumps and Gas Boosters: Manufacturing and distribution of high-pressure liquid pumps, gas boosters, air amplifiers, and system packages for oil and gas, mining, diving, fire, aviation, and hydrogen industries. Producing 85% of products internally enables fast response to customer engineering needs.
3. Flow Measurement Products: Manufacture and sale of flow meters (turbine, positive displacement, variable area) and flow computers for aerospace, pharmaceutical, petrochemical, laboratory, food, and energy industries. Includes calibration and repair services.
4. Aftermarket Support and Spare Parts: Aftermarket support including overhaul and upgrade of existing equipment, spare parts supply (over 1,200 components in stock), and training and certification courses. Revenue from parts sales, refurbishment services, and training programs.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Hydraulics International designs, engineers, qualifies, manufactures, and supports mission-critical hydraulic, pneumatic, and electro-mechanical systems for aerospace, defense, and industrial customers. Its product portfolio spans military and commercial aircraft ground support equipment (hydraulic test systems, pneumatic test systems, ammunition loading systems, fluid servicing units, nitrogen/oxygen systems), high-pressure liquid pumps and air-driven gas boosters rated up to 60,000 PSI, and precision flow meters and flow computers. The company serves defense forces, aerospace prime contractors, oil and gas, hydrogen, mining, fire, pharmaceutical, and energy markets worldwide.

Product overview

Hydraulics International is a specialized manufacturer of mission-critical fluid dynamics systems serving aerospace, defense, and industrial markets. The company operates through three divisions: Military & Commercial AGSE (Aerospace Ground Support Equipment), Pumps Division, and Flowmetrics Division. The Military & Commercial AGSE Division provides hydraulic and pneumatic test systems, fluid servicing equipment, and ammunition loading systems for both military and commercial aviation customers. The Pumps Division offers high-pressure liquid pumps, gas boosters, air pressure amplifiers, and system packages for oil and gas, mining, diving, fire, hydrogen, and aviation industries. The Flowmetrics Division manufactures turbine flow meters, positive displacement flow meters, flow computers, and signal conditioners for aerospace, pharmaceutical, food, and energy industries. The company operates vertically integrated manufacturing facilities in Chatsworth, CA totaling 800,000 sq. ft.

Differentiator

Problem solved

Functional benefit

Brands

• HII Group Divisions - Military & Commercial AGSE: Provides high-quality aviation ground support equipment including hydraulic test systems, ammunition loaders, pneumatic test systems, nitrogen and oxygen systems, and fluid servicing equipment for military and commercial aviation.
• HII Pumps Division
• HII Flowmetrics Division

Products and services

• Military Aerospace Ground Support Equipment (AGSE) Flight-critical, highly-engineered ground support equipment for military aviation including hydraulic test systems, hydraulic purification units, pneumatic test systems, nitrogen and oxygen systems, ammunition loading systems, replenishers, cradles, and transport loaders for fighter aircraft. Used by U.S. and allied defense forces and aerospace prime contractors on platforms such as the F-35 and V-22 Osprey.
• Commercial Aerospace Ground Support Equipment (AGSE) Pneumatic, hydraulic, and fuel test systems and fluid servicing equipment and components for commercial aviation operators and MROs worldwide, including fuel, pneumatics, hydraulics, lubrication solutions, and specialized components used by airlines such as Air Canada, American Airlines, British Airways, and Qantas.
• High Pressure Pumps and Gas Boosters High-pressure liquid pumps, air-driven gas compressors (gas boosters), air pressure amplifiers, and system packages rated up to 60,000 PSI for hydrostatic testing of choke and kill lines, Christmas trees, valves, pipelines, and pressure vessels in oil and gas, mining, diving, fire, hydrogen/fuel cell, and aviation industries.
• Flow Meters and Flow Computers Turbine flow meters (in-line and insertion), positive displacement flow meters, variable area flow meters (rotameters), ratemeters, totalizers, batch controllers, flow computers, signal conditioners, and field indicators for liquid and gas flow measurement in aerospace, pharmaceutical, petrochemical, laboratory, food, and energy applications. Includes on-site calibration services.
• Aftermarket Support, Spare Parts, and Training Aftermarket overhaul and upgrade of existing equipment, spare parts supply (over 1,200 components in stock, ~70% of parts produced in advance), and training and certification courses to ensure equipment longevity and minimize customer downtime.

Quantifiable outcome

• Delivered F-35 ammunition loader in 2 years after previous contractor failed after 4 years
• +5 more outcomes

Named customers17 records

Segments10 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators7 records

Recent moves5 records

Expansion highlights6 records

Broad incumbents

• Parker Hannifin: Global leader in motion and control technologies, including aerospace hydraulics, fuel systems, and pumps. Directly competes with HII across aerospace fluid power and high-pressure pumps, but as part of a far broader $20B+ industrial portfolio.
• Eaton Aerospace: Eaton's Aerospace division (including legacy Aeroquip) manufactures hydraulic, fuel, and pneumatic systems for military and commercial aircraft. Overlaps with HII's AGSE and fluid power capabilities as part of Eaton's broader $20B+ power management portfolio.
• Collins Aerospace (RTX): Major aerospace systems supplier within RTX, including hydraulic, environmental control, and fuel systems. Overlaps with HII's mission-critical AGSE and fluid dynamics products as part of a much broader commercial/military aerospace portfolio.
• Senior plc: UK-based engineered solutions provider with fluid conveyance and aerospace hydraulic/pneumatic product lines serving major OEMs. Comparable to HII's aerospace fluid systems business as part of Senior's broader industrial portfolio.
• Honeywell Aerospace: Major Tier 1 aerospace supplier offering hydraulic, environmental control, fuel, and propulsion systems. Overlaps with HII's mission-critical aerospace fluid systems as part of a much larger diversified aerospace and defense portfolio.

Direct peers

• Moog Inc. Designs and manufactures high-performance precision motion control products including hydraulic servo systems, pumps, and electrohydraulic actuators for aerospace, defense, and industrial markets — directly comparable to HII's electrohydraulic and motion control offerings.
• Triumph Group: Supplies aerospace hydraulic and pump systems, mechanical components, and MRO services to defense primes and commercial OEMs. Highly comparable to HII in serving military aerospace fluid systems and aftermarket programs.
• Hydro Inc. Specializes in hydraulic and mechanical equipment repair, manufacturing, and field services for aerospace, defense, and industrial markets. Closely aligned with HII's fluid power MRO and custom hydraulic system capabilities.
• Arkwin Industries: Designs and manufactures hydraulic, pneumatic, and fuel system components for military and commercial aerospace — directly comparable to HII's AGSE and fluid servicing equipment lines serving defense primes.
• Heroux-Devtek: Canadian aerospace manufacturer specializing in landing gear, hydraulic systems, and fluid handling components for military and commercial aircraft. Closely comparable to HII's specialized aerospace hydraulic and fluid power systems business.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/hydraulics-international-inc.
• Xx.com/hii_agse

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Hydraulics International