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Marine Equipment Hydraulic Cylinder OEM/ODM
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Marine Equipment Hydraulic Cylinders Manufacturers

As hydraulic actuators designed for mechanical equipment in marine environments, Marine Equipment Hydraulic Cylinders are highly compatible with the complex needs of ships and marine engineering. These hydraulic cylinders are designed with salt spray corrosion-resistant materials and anti-corrosion coatings, which can effectively resist seawater erosion and extend their service life. In addition, the sealing system of the hydraulic cylinder is specially designed with sealing to prevent hydraulic oil leakage, thereby reducing maintenance costs and improving equipment reliability. Its high-strength material ensures that it can withstand the huge loads and impacts in marine operations, adapt to the harsh conditions of tasks such as ship cargo lifting, deck lifting platforms, and steering gear operation, and can be widely used in ships, marine engineering, and port equipment. They can be used to drive the ship's steering system, lifting equipment, lifting platforms, anchor machines, and other key operating components. At the same time, in complex marine engineering equipment such as offshore drilling platforms, offshore wind power project,s and submersibles, Marine Equipment Hydraulic Cylinders are an important part of the propulsion system, used to control the lifting and lowering of the platform, the movement of the telescopic arm and the operation of the stabilizing device, to ensure the efficiency and safety of offshore operations. Its importance in ships and marine engineering is self-evident.

Jiangsu Hengcai Hydraulic Mechanical Co., Ltd.

Established in 1988, Jiangsu Hengcai Hydraulic Machinery Manufacturing Co., Ltd. has been dedicated to the research and development as well as the manufacturing of hydraulic cylinders. Situated in Jianhu County, Yancheng City, Jiangsu Province, the factory enjoys a strategic location with Dafeng Port to the east, Xuzhou to the west, Nantong to the south, and Lianyungang to the north. The Xinchang Railway traverses the area, and the 204 National Highway, Coastal Expressway, Yancheng-Xuzhou Expressway, and Ningjingyan Expressway crisscross the region, providing a well-connected transportation network. The proximity to Yancheng Nanyang International Airport, just a 70-kilometer drive away, has laid a solid foundation for the company's rapid growth.


As China Marine Equipment Hydraulic Cylinders Manufacturers and Marine Cylinder Suppliers, our hydraulic cylinder products are widely used across various industries, including petroleum, chemical, marine, coal, metallurgy, engineering, construction, machine tools, agricultural machinery, and transportation, serving over 40 large and medium-sized main machine factories. Our products are also exported to the United States, Japan, Russia, and other countries and regions, accompanying the main machines, thus expanding our product's reach globally.


Adhering to the corporate spirit of "Advocate the persistence, endeavour for the winning," and the corporate philosophy of "Technological innovation and technology, people-oriented," we strive to provide reliable products and services in return for the trust of our valued customers.

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Marine Equipment Hydraulic Cylinders Industry knowledge

Marine Equipment Hydraulic Cylinders Built for Saltwater Service

Marine equipment hydraulic cylinders face salt-laden air, spray, shock loads and long duty cycles. At Jiangsu Hengcai Hydraulic Mechanical Co., Ltd., we have manufactured hydraulic cylinders since 1988, and our Marine Equipment Hydraulic Cylinders manufacturer program is designed specifically for ships, marine engineering and port machinery. As the source factory, we configure bore, rod, stroke, plating and sealing around the working point of each project rather than supplying a one-size-fits-all actuator.

Together with our Construction Hydraulic Cylinders line, the marine range supports original-equipment manufacturers and end users who need documented cylinders for steering gear, deck lifting platforms, anchor machines, lifeboat drop gear, cranes, Ro-ro ramps, offshore drilling equipment and submersible support systems. Our factory is located in Jianhu County, Yancheng City, Jiangsu Province, with convenient access to ports and the 70-km drive from Yancheng Nanyang International Airport.

Product Range and Application Fit

The Marine Equipment Hydraulic Cylinders category contains two dedicated product types. Both share the same marine design discipline, but each is sized for a different duty envelope.

Product Type Bore Diameter Rod Diameter Stroke Working Pressure Typical Applications
Marine Machinery Hydraulic Cylinder 30-400 mm 16-320 mm 10-5000 mm 16-35 MPa Marine steering gear, lifeboat drop gear, deck machinery
Marine Crane Hydraulic Cylinder 110-650 mm 80-560 mm 150-8000 mm 16-35 MPa Ro-ro ship, marine crane, mobile port crane

The marine machinery cylinder covers the smaller-to-medium envelope used by steering gear, lifeboat lowering systems, deck lifting platforms and anchor machinery. The marine crane cylinder is the larger-force variant for Ro-ro ships, marine cranes and mobile cranes; its bore extends to 650 mm and stroke to 8000 mm, with push force up to 4962 kN to handle heavy cargo and lifting loads.

Materials, Plating and Sealing for Marine Environments

Seawater is the primary wear factor for a marine cylinder. Standard industrial chrome plating is not enough for sustained salt spray exposure, so our marine designs use a different surface and sealing strategy.

  • Rod corrosion protection: the marine machinery cylinder uses three-layer chromium composite electroplating plus sealing wax treatment on the rod outer circle. The marine crane cylinder uses double-layer chromium composite electroplating, and its piston rod passes salt spray testing for more than 200 hours.
  • Base materials: we select stainless steel, alloy steel and other corrosion-resistant metals to handle high load and seawater exposure. The specific material is matched to the force requirement, welding design and environmental class.
  • Sealing system: compound sealing technology reduces the impact of oil pressure and improves sealing performance. PTFE and wear-resistant rubber seals maintain elasticity under high pressure and high humidity, preventing seawater from entering the oil system.
  • Welding quality: sheathed U-butt welding is used for structural joints, improving weld performance and appearance in the cylinder body and mounting components.

Engineering and Manufacturing Control

We are a direct hydraulic cylinder factory, not an assembly-only workshop. Core processes such as welding, heat treatment, electroplating and spraying are kept in-house to control quality. The plant has 22 manufacturing processes and 109 processing capabilities, with a self-made parts rate of 70%.

Our annual output exceeds 80,000 hydraulic cylinders, serving more than 40 large and medium-sized main-machine factories. Marine cylinders also accompany original equipment to the United States, Japan, Russia and other markets. For marine projects that need high thrust in a compact envelope, our technical toolbox includes buffer technology, double-acting multi-stage cylinder thrust technology, slender rod and barrel processing, and intelligent cylinder data collection.

R&D is managed through TeamCenter PLM, SAP and our in-house Wing platform. This keeps design, process planning, BOMs and test records traceable from prototype development through serial production and order conversion.

Quality Assurance and Acceptance

Cylinders intended for shipboard service are verified before leaving the factory. Our test capability includes the internationally advanced 2P-2F durability test bench and a reciprocating and buffer comprehensive performance test bench. Physical/chemical and metallographic laboratories support material verification, while specialized measurement systems check dimensional accuracy and mounting geometry.

  • Pressure and fatigue verification before commissioning.
  • Salt spray checks on plated rods for marine exposure.
  • ISO9001, ISO14001 and CE certification covering production and management systems.
  • Record keeping for each job to support traceability in serial production.

For steering systems, lifeboat drop gear and crane cylinders, failure is not an operational option. That is why the acceptance process combines dimensional, material, pressure and durability evidence rather than a simple function check.

Information We Use to Configure Your Solution

Send us the operating conditions rather than only a part number. Our proposal is built on the actual duty, interface and environmental class of your equipment.

  • Equipment type and installation point: steering gear, lifeboat drop gear, deck crane, Ro-ro ramp, offshore platform or port machinery.
  • Duty data: required push and pull force, working pressure, stroke, cycle frequency and duty factor.
  • Geometry: mounting style, rod end, port location and size, and available installation envelope.
  • Marine environment: continuous seawater splash, expected salt spray hours, operating temperature range, topside or underwater service.
  • Integration requirements: control interface, position feedback, limit switches, cushioning and data collection needs.
  • Project scope: drawings or samples, target quantity, required documentation, plating or coating preferences, and certification or test requirements.

Customization, Installation and Service

Most of our marine cylinders are custom products. We develop from customer drawings or samples and also offer standard products where the published envelope fits the application. If load, stroke or mounting deviates from the table above, we review the design before quoting and confirm the interface with your engineering or integration team.

Our after-sales scope includes installation support, commissioning and operator training. A reported quality issue receives a response within 24 hours, with diagnosis within 3-5 days. The warranty period is one year against defects in material and workmanship under normal use; depending on the diagnosis, we replace the cylinder or apply a discount on the next order. For long-term fleet support, we can supply metal parts, pipe joints, sealing rings and rubber components.

Frequently Asked Questions

Which marine cylinder type is right for our equipment?

Marine machinery cylinders fit steering gear, lifeboat drop gear, deck lifting platforms and anchor machinery, with bore diameters from 30 mm to 400 mm. Marine crane cylinders fit Ro-ro ships, marine cranes and mobile cranes, with bore diameters from 110 mm to 650 mm. When your force or stroke falls outside these ranges, we configure a custom cylinder from the same design basis.

How do you prevent seawater corrosion on the rod?

The rod is protected by composite chromium electroplating. Marine machinery cylinders use a three-layer process with sealing wax, while marine crane cylinders use a double-layer process with salt spray resistance over 200 hours. Base material selection, barrel coating and sealing are coordinated with the exposure level of the installation.

What information does Hengcai need for a quotation?

Provide application type, push and pull force, working pressure, stroke, mounting and rod end, port positions, operating temperature, exposure to seawater or spray, control interface and target quantity. If drawings or samples exist, include them; this allows us to propose a configuration and acceptance plan rather than a generic cross-reference.

Can you manufacture custom or OEM marine cylinders?

Yes. We are the source factory and primarily produce customized products. We develop from customer drawings or samples, and we also produce standard cylinders. OEM/ODM programs cover product design, process planning, trial production, testing and order conversion.

How are cylinders tested before delivery?

Testing is based on the duty and contract requirements. Our capability includes the 2P-2F durability test bench, reciprocating and buffer performance test bench, physical/chemical and metallographic laboratories, and pressure and fatigue verification before commissioning. Job records support traceability for serial production.

What warranty and after-sales service do you provide?

We provide a one-year warranty against defects in material and workmanship under normal use. We respond within 24 hours to reported issues and aim to diagnose within 3-5 days. Depending on the result, we replace the cylinder or apply a discount on the next order. Installation, commissioning, training and long-term accessory supply are part of the support scope.