Product Description

YDH Series Hollow Plunger Cylinders
Double-Acting, Hydraulic Return 30-140 tons capacity 1.5-10.13" stroke(38-258mm) Central Hole
Diameter 1.13-3.13"(33.3-79.2 mm) Max. Pressure 10000 CHINAMFG (700bar)

1.Collar threads supply an easy fixture.

2.With different mounting attachment, the application possibilities are greatly extended.
3.Special designed cup seal provides for steady and durable performance.

4. High strength alloy steel body is durable for long working life.

5. Chrome plated rod prevent rust and corrosion.



Specification Dimension


YDH Series Hollow Cylinder Specification Sheet
Model No. Stroke
Oil Capacity 
Cylinder Effective Area  
Max. Cylinder
Advance Retract Advance Retract Advance Retract
YDH-307 178 829 541 46,6 30,4 36 24 21
YDH-3571 258 1202 784 46,6 30,4 36 24 27
YDH-603 89 733 482 82,3 54,2 64 42 28
YDH-606 166 1366 900 82,3 54,2 64 42 35
YDH-6571 257 2115 1393 82,3 54,2 64 42 45
YDH-1001 38 505 333 133,0 87,4 103 68 33
YDH-1003 76 1011 666 133,0 87,4 103 68 61
YDH-1006 153 2035 1337 133,0 87,4 103 68 79
YDH-1571 257 3420 2246 133,0 87,4 103 68 106
YDH-1508 203 4144 2083 204,1 102,6 158 80 111

 YDH Series Hollow Cylinder Dimensions Sheet(Metric)
Model No. A
Base to
Bolt Circle (mm)
YDH-307 330 508 114 889  635  25 60 63 9 113/16'-16 22 4Y"-12 42 333  92,2 3/8" - 16 15,7
YDH-3571 431 689 114 889  635  25 60 63 9 113/16'-16 22 4k"-12 42 333  92,2 3/8" - 16 15,7
YDH-603 247 336 159 1,239  919  31 66 91 12 2%"-16 19 6W"-12 48 538  130,0 ½" - 13 14,0
YDH-606 323 489 159 1,239  919  31 66 91 12 2%"-16 19 6W"-12 48 538  130,0 ½" - 13 14,0
YDH-6571 438 695 159 1,239  919  31 66 91 12 2X"-16 19 6W"-12 48 538  130,0 ½" - 13 14,0
YDH-1001 165 203 212 1,651  1,270  38 44 126 12 4"-16 25     792  177,8 5/8" - 11 19,0
YDH-1003 254 330 212 1,651  1,270  38 85 126 12 4"-16 25 8%"-12 60 792  177,8 5/8" - 11 19,0
YDH-1006 342 495 212 1,651  1,270  38 85 126 12 4"-16 25 8%"-12 60 792  177,8 5/8" - 11 19,0
YDH-1571 460 717 212 1,651  1,270  38 85 126 12 4"-16 25 8%"-12 60 792  177,8 5/8" - 11 19,0
YDH-1508 349 552 247 190.5 1,524  38 60 127 4 4W"-12 25     792  - - -

Company Profile

After Sales Service


Q1: How to contact sales? 
A1:  Please email or call us.

Q2: How to make payment? 
A2: Accept WESTERN UNION and T/T transfer.

Q3: How long does it take to process orders?
A3:We have stock for most models, which will take 5-7 days. If no stock, it will takes about 21-45 days according to the models and quantities of your demand.

Q4: What's your cylinder MOQ limitation?
A4:As for 5ton-25Tons cylinders, the MOQ is 50pcs for every model number; as for 30ton-400Tons cylinders, the MOQ is 10 pcs for every model number.

Q5: What information I should let you know to confirm the type of cylinder?
A5:Please let us know the working pressure, cylinder stroke, tonnage capacity, retracted height, and the working application sceanarios.

Q6: Is it possible to design the special specification except the model in CHINAMFG catalog?
A6: Yes, you need to send us the detailed requirements and drawing pictures with stroke and tonnage etc.

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Certification: CE, ISO9001
Pressure: High Pressure
Work Temperature: Normal Temperature
Acting Way: Double Acting
Working Method: Straight Trip
Adjusted Form: Regulated Type
US$ 120/Unit
1 Unit(Min.Order)




hydraulic cylinder

How does a hydraulic ram contribute to controlled and precise movement?

A hydraulic ram plays a crucial role in enabling controlled and precise movement. Here's a detailed explanation:

1. Hydraulic Fluid: Hydraulic rams operate by utilizing hydraulic fluid, which acts as a medium for transmitting force. The fluid is incompressible, allowing force to be evenly distributed throughout the system. This property ensures that the movement of the ram is smooth and consistent, contributing to controlled and precise motion.

2. Flow Control: Hydraulic rams incorporate flow control mechanisms to regulate the rate of fluid flow. Flow control valves, such as throttle valves or flow restrictors, can be used to adjust the speed at which the fluid enters or exits the ram. By controlling the flow rate, the speed of the ram's movement can be precisely managed, enabling controlled and precise motion.

3. Pressure Regulation: The hydraulic pressure within the system directly influences the force output and speed of the hydraulic ram. By controlling the pressure using pressure control valves or regulators, the movement of the ram can be finely tuned. Adjusting the pressure allows for precise control over the force applied by the ram, resulting in controlled and precise movement.

4. Piston and Cylinder Design: The design of the piston and cylinder in a hydraulic ram contributes to controlled and precise movement. The fit between the piston and cylinder is designed to minimize leakage and ensure smooth operation. This tight clearance helps maintain accurate positioning and prevents unwanted movement or drift, allowing for precise control over the ram's motion.

5. Proportional Control Systems: Advanced hydraulic ram systems can incorporate proportional control systems that enable precise movement control. These control systems use sensors and feedback mechanisms to monitor and adjust the position, speed, and force of the ram in real-time. By continuously adapting to changing conditions, the control system ensures precise and accurate movement, even in complex applications.

6. Position Sensing: Hydraulic rams can be equipped with position sensing devices, such as linear transducers or encoders, to provide feedback on the ram's position. This feedback allows for precise positioning of the ram and ensures accurate movement control. The position sensing information can be used in conjunction with control systems to achieve the desired level of precision in the ram's motion.

Through the use of hydraulic fluid, flow control mechanisms, pressure regulation, piston and cylinder design, proportional control systems, and position sensing devices, hydraulic rams contribute to controlled and precise movement. These features make hydraulic rams well-suited for applications that require accurate positioning, gradual motion, or precise force application.

Can hydraulic rams be applied in both mobile and stationary machinery?

Yes, hydraulic rams can be applied in both mobile and stationary machinery. Here's a detailed explanation:

Hydraulic rams are versatile components that find applications in various industries and machinery types. Their ability to generate and transmit high forces makes them suitable for a wide range of mobile and stationary applications.

1. Mobile Machinery: Hydraulic rams are commonly used in mobile machinery, such as construction equipment, agricultural machinery, material handling vehicles, and transportation vehicles. In these applications, hydraulic rams are utilized for tasks such as lifting, pushing, pulling, tilting, and steering. Mobile machinery often requires compact and efficient power systems, and hydraulic rams provide the necessary force multiplication capabilities while being adaptable to different operational conditions.

2. Stationary Machinery: Hydraulic rams are also extensively employed in stationary machinery across various industries. Examples include hydraulic presses, industrial robots, machine tools, hydraulic lifts, and heavy-duty equipment. In stationary machinery, hydraulic rams are utilized for precision positioning, applying controlled force, clamping, bending, or pressing operations. The ability to control and adjust the force, speed, and position of hydraulic rams makes them ideal for applications that require accurate and repeatable motion.

3. Common Applications: Hydraulic rams can be found in a wide range of specific applications. For mobile machinery, this may include the hydraulic cylinders used in excavators to control the boom, arm, and bucket movements. In stationary machinery, hydraulic rams are often employed in hydraulic presses for metal forming, hydraulic clamps for workholding, or hydraulic actuators for precise motion control. The flexibility of hydraulic rams allows for customization to suit specific requirements in diverse industries.

4. Advantages in Both Mobile and Stationary Machinery: The use of hydraulic rams provides several advantages in both mobile and stationary machinery. These include high force output, adjustable force and speed, smooth operation, compact design, reliability, and durability. Hydraulic systems offer efficient power transmission and can be easily integrated into different machinery designs, making them a popular choice in a wide range of applications.

Overall, hydraulic rams can be effectively applied in both mobile and stationary machinery, offering the benefits of force multiplication, precise control, and adaptability to diverse operational requirements.

hydraulic cylinder

Can hydraulic rams be used in construction equipment like bulldozers?

Yes, hydraulic rams are commonly used in construction equipment like bulldozers. Here's a detailed explanation:

1. Blade Control: Bulldozers are equipped with large blades mounted at the front, which are used for various tasks such as pushing and leveling soil, debris, or other materials. Hydraulic rams play a crucial role in controlling the movement of these blades. The hydraulic rams are connected to the bulldozer's hydraulic system and enable the operator to adjust the angle, height, and tilt of the blade. By utilizing hydraulic rams, bulldozer operators can precisely control the blade's position and apply the necessary force for efficient earthmoving and grading operations.

2. Ripper Attachment: Bulldozers often have ripper attachments at the rear of the machine. The ripper is used to break up hard or compacted soil, rocks, or pavement surfaces. Hydraulic rams are utilized to control the movement of the ripper attachment. The rams enable the operator to raise, lower, and angle the ripper, allowing for effective penetration and loosening of the ground. Hydraulic rams provide the necessary force and control to handle tough materials and enhance the bulldozer's versatility in various construction applications.

3. Track System: Bulldozers feature a track system for mobility and traction on rough terrain. Hydraulic rams are integral components of the bulldozer's track system, responsible for controlling the movement and tension of the tracks. The rams allow for adjustments in track tension to optimize the grip and stability of the bulldozer when operating on different ground conditions. By utilizing hydraulic rams in the track system, bulldozers can maneuver efficiently and maintain traction even in challenging construction environments.

4. Hydraulic Power: Hydraulic rams in bulldozers are powered by a hydraulic system that consists of a hydraulic pump, valves, and actuators. The hydraulic system provides the necessary power and control to operate the hydraulic rams effectively. Bulldozers typically have robust hydraulic systems capable of generating high forces, allowing the rams to exert significant pushing or lifting capabilities. The hydraulic power provided by the system enables bulldozers to perform heavy-duty construction tasks with precision and efficiency.

5. Operator Control: Bulldozer operators have control over the hydraulic rams through hydraulic control levers or joysticks in the operator cabin. These controls allow operators to manipulate the position, speed, and force of the hydraulic rams, providing precise control over the blade and ripper attachments. The intuitive and responsive nature of hydraulic controls enhances the operator's ability to perform tasks accurately and efficiently.

In summary, hydraulic rams are extensively used in construction equipment like bulldozers to control the blade and ripper attachments, manage the track system, provide hydraulic power, and offer operator control. The integration of hydraulic rams enhances the performance, versatility, and productivity of bulldozers in various construction and earthmoving applications.

hydraulic cylinder

What is a hydraulic ram and how does it work?

A hydraulic ram is a type of water pump that utilizes the energy of flowing water to lift a portion of that water to a higher elevation. Here's a detailed explanation of its working principle:

A hydraulic ram consists of several key components:

  • Drive Pipe: The drive pipe is connected to a water source, such as a stream or a river. It carries the flowing water that provides the energy for the hydraulic ram.
  • Delivery Pipe: The delivery pipe carries the water from the hydraulic ram to the desired destination at a higher elevation.
  • Valve: The valve controls the flow of water within the hydraulic ram.
  • Air Vessel: The air vessel acts as an accumulator and helps maintain a constant flow of water.

The working principle of a hydraulic ram can be summarized in the following steps:

1. Water Flow: The hydraulic ram is installed in a location where there is a natural flow of water. As water flows through the drive pipe, it enters the hydraulic ram.

2. Water Hammer Effect: The flowing water gains momentum and velocity as it enters the hydraulic ram. When the water flow is abruptly stopped by the valve, the kinetic energy of the moving water is converted into pressure energy, creating a water hammer effect.

3. Valve Operation: The sudden increase in pressure due to the water hammer effect forces the valve to close, preventing the backward flow of water. This closure allows the pressure to build up in the hydraulic ram.

4. Air Vessel Operation: As the pressure builds up, it compresses the air in the air vessel. The compressed air acts as a cushion, absorbing the pressure fluctuations and maintaining a constant flow of water.

5. Delivery Phase: Once the pressure reaches a certain threshold and the valve closes, the compressed air in the air vessel pushes the water through the delivery pipe, lifting a portion of the water to a higher elevation.

6. Valve Reopening: As the water is pushed out through the delivery pipe, the pressure in the hydraulic ram decreases. This causes the valve to reopen, allowing the cycle to repeat.

7. Continuous Operation: The hydraulic ram operates continuously as long as there is a steady flow of water in the drive pipe. It uses the energy of the flowing water to lift a smaller portion of that water to a higher elevation, without the need for external power sources.

Hydraulic rams are commonly used in areas with a reliable water source and a need for pumping water to a higher elevation. They are particularly useful in remote locations or off-grid settings, where conventional power sources may not be readily available.

China Good quality Double Acting Pneumatic Hydraulic RAM   vacuum pump connector	China Good quality Double Acting Pneumatic Hydraulic RAM   vacuum pump connector
editor by CX 2024-03-28