Product Description


Product Description

 Hydraulic Cylinder Jack

Capacity: 50-800ton
Stroke: 50-300mm
Max.pressur: 700bar

SJL Series Single-Acting High Tonnage Hydraulic Cylinders 

1. Single acting, loads return.
2. Hard chrome plated high quality steel plungers.
Plunger wiper reduces contamination, extending cylinder life.
3. The exclusive guide Ring is designed absorbs eccentric loading without galling cylinder parts, reduces wear and extending life.
4. Special painted surface to increase corrosion resistance.
5. Easy fixturing with base mounting holes.
6. All model include quick couplings (NPT3/8"-18) and dust-proof cap.


Cylinder Capacity Stroke Model Number Cylinder Effective Area Oil Capacity Collapsed Height Extended Height Outside Dia. Cylinder Bore Dia Plunger Dia.(Thread) Base to Advance Port Saddle Dia. Saddle Max.Tilt Angle Lock nut Height Weight
        A B C D E F H R S  
ton(KN) (mm) (cm2) (cm3) (mm) (mm) (mm) (mm) (mm) (mm) (mm)   (mm) (kg)
50 SJL50-50 78.5 392 192 242 140 100 Tr99x4 24 90 30 18
100 SJL50-100 78.5 784 242 342 140 100 Tr99x4 24 90 30 25
150 SJL50-150 78.5 1176 292 442 140 100 Tr99x4 24 90 30 33
200 SJL50-200 78.5 1568 342 542 140 100 Tr99x4 24 90 30 41
300 SJL50-300 78.5 2352 442 742 140 100 Tr99x4 24 90 30 53
50 SJL100-50 153.9 770 213 263 188 140 Tr139x6 26 130 40 46
100 SJL100-100 153.9 1540 263 363 188 140 Tr139x6 26 130 40 57
150 SJL100-150 153.9 2310 313 463 188 140 Tr139x6 26 130 40 68
200 SJL100-200 153.9 3080 363 563 188 140 Tr139x6 26 130 40 79
300 SJL100-300 153.9 4620 463 763 188 140 Tr139x6 26 130 40 101
50 SJL150-50 226.9 1134 209 259 228 170 Tr159x6 49 160 38 56
100 SJL150-100 226.9 2269 259 359 228 170 Tr159x6 49 160 38 70
150 SJL150-150 226.9 3403 309 459 228 170 Tr159x6 49 160 38 83
200 SJL150-200 226.9 4538 359 559 228 170 Tr159x6 49 160 38 97
300 SJL150-300 226.9 6806 459 759 228 170 Tr159x6 49 160 38 124
50 SJL200-50 314 1570 243 293 268 200 Tr199x6 51 186 52 93
150 SJL200-150 314 4712 343 493 268 200 Tr199x6 51 186 52 131
300 SJL200-300 314 9423 493 793 268 200 Tr199x6 51 186 52 189
50 SJL300-50 490.6 2453 295 345 320 250 Tr249x6 59 236 60 179
150 SJL300-150 490.6 7359 395 545 320 250 Tr249x6 59 236 60 240
300 SJL300-300 490.6 14718 545 845 320 250 Tr249x6 59 236 60 331
50 SJL400-50 615.4 3077 335 385 370 280 Tr279x6 70 256 70 266
150 SJL400-150 615.4 9231 435 585 370 280 Tr279x6 70 256 70 345
300 SJL400-300 615.4 18462 585 885 370 280 Tr279x6 70 256 70 464
50 SJL500-50 803.8 4019 375 425 420 320 Tr319x6 80 306 80 358
150 SJL500-150 803.8 12057 475 625 420 320 Tr319x6 80 306 80 454
300 SJL500-300 803.8 24114 625 925 420 320 Tr319x6 80 306 80 597
50 SJL600-50 1017.4 5087 395 445 500 360 Tr359x6 85 346 85 490
150 SJL600-150 1017.4 15261 495 645 500 360 Tr359x6 85 346 85 614
300 SJL600-300 1017.4 30522 645 945 500 360 Tr359x6 85 346 85 800
50 SJL800-50 1256 6280 455 505 550 400 Tr399x6 100 386 100 843
150 SJL800-150 1256 18840 555 705 550 400 Tr399x6 100 386 100 1571
300 SJL800-300 1256 37698 705 1005 550 400 Tr399x6 100 386 100 1306

All SAIVS Hydraulic Lifting Cylinders Jack go with calibration certificates,
Your Requirements Can Be Customized, Please Contact Us Freely!

Detailed Photos



800 T Single-Acting Lock - Nut Hydraulic Cylinders

Removable hardened saddles protect plunger during lifting and pressing.
According to different work environment, special cylinder could be customized.

SAIVS is a professional manufacturer in hydraulic tools and products, Hydraulic lifting cylinder & jack and Hydraulic pumps.

Our full rang of popular hydraulic cylinder reserviors including jacking, pushing, pulling, supporting etc.

Our hydraulic products have been widely used in petrochemical, Building, shipbuilding, steel plant and heavy constructions areas etc.





Packaging & Shipping

Company Profile

Established in HangZhou, China, CHINAMFG began as a manufacturer and exporter of different kinds of casting and precision CNC machining components, industrial customized parts. CHINAMFG has the experience to develop thousands of tooling and fixtures in house according to customers' drawings.

In 2002, hydraulic tools research department was settled and company developed its first line of hydraulic tools and equipment. Today CHINAMFG is reckoned as 1 of the most preferred experienced manufacturer and exporter of hydraulic tools, hydraulic pumps & hydraulic components in the industrial market.

We have more than 200 employees total, that work at casting foundries, CNC machining plant. we have nice reputation in components supply chain, as we have better management system, positive teamwork cooperation and advanced equipment. We obtained certificates of TS16949, ISO9001, ISO14001 and OSHAS ISO 18001.


Q: Are you trading company or manufacturer?
A: We are factory with more than 20 years experience.

Q: How long for delivery?
A: Generally it is 15-30days as we are customized service we confirm with customer when place order.

Q: What is the MOQ?
A: It depends on what you are buying. Normally, our minimum order is 1 20' full container and LCL container (less than a
container load) can be acceptable.

Q: Can you customize my products?
A: Yes, we can customized products with your design drawings like DWG, DXF, DXW, IGES, STEP, PDF etc.

Q: What is your terms of payment?
A: 30% T/T in advance, balance before shipment, or as per discussion.

Q: What about your quality control?
A: * . Checking the raw material after they reach our factory-----Incoming quality control(IQC)
* . Checking the details before the production line operated
* . Have full inspection and routing inspection during mass production----In-process quality control(IPQC)
* . Checking the goods after they are finished----Final quality control(FQC)
* . Checking the goods after they are finished----Outgoing quality control(QC)
* . 100% inspection and delivery before shipment

After-sales Service: Yes
Warranty: 1 Year
Type: Hydraulic Jack
Structure: Hydraulic Jack
Capacity (Load): 50-800 T
Power Source: Hydraulic


hydraulic cylinder

How do hydraulic cylinders handle the challenges of minimizing friction and wear?

Hydraulic cylinders employ several mechanisms and techniques to effectively minimize friction and wear, ensuring optimal performance and longevity. Minimizing friction and wear is crucial for hydraulic cylinders as it helps to maintain efficiency, reduce energy consumption, and prevent premature failure. Here's a detailed explanation of how hydraulic cylinders handle the challenges of minimizing friction and wear:

1. Lubrication:

- Proper lubrication is essential for minimizing friction and wear in hydraulic cylinders. Lubricating fluids, such as hydraulic oils, are used to create a thin film between moving surfaces, reducing direct metal-to-metal contact. This lubricating film acts as a protective barrier, reducing friction and preventing wear. Regular maintenance practices include monitoring and maintaining the appropriate lubricant levels to ensure optimal lubrication and minimize frictional losses.

2. Surface Finishes:

- The surface finishes of components in hydraulic cylinders play a crucial role in minimizing friction and wear. Smoother surface finishes, achieved through precision machining, grinding, or the application of specialized coatings, reduce surface roughness and frictional resistance. By minimizing surface irregularities, the risk of wear and friction-induced damage is significantly reduced, resulting in improved efficiency and extended component life.

3. High-Quality Sealing Systems:

- Well-designed and high-quality sealing systems are crucial for minimizing friction and wear in hydraulic cylinders. Seals prevent fluid leakage and contamination while maintaining proper lubrication. Advanced sealing materials, such as polyurethane or composite materials, offer excellent wear resistance and low friction characteristics. Optimal seal design and proper installation ensure effective sealing, minimizing friction and wear between the piston and cylinder bore.

4. Proper Alignment and Clearances:

- Hydraulic cylinders must be properly aligned and have appropriate clearances to minimize friction and wear. Misalignment or excessive clearances can result in increased friction and uneven wear, leading to premature failure. Proper installation, alignment, and maintenance practices, including regular inspection and adjustment of clearances, help ensure smooth and even movement of the piston within the cylinder, reducing friction and wear.

5. Filtration and Contamination Control:

- Effective filtration and contamination control are essential for minimizing friction and wear in hydraulic cylinders. Contaminants, such as particles or moisture, can act as abrasive agents, accelerating wear and increasing friction. By implementing robust filtration systems and proper maintenance practices, hydraulic systems can prevent the ingress of contaminants, ensuring clean and properly lubricated components. Clean hydraulic fluids help minimize wear and friction, contributing to improved performance and longevity.

6. Material Selection:

- The selection of appropriate materials for hydraulic cylinder components is crucial in minimizing friction and wear. Components subject to high frictional forces, such as pistons and cylinder bores, can be made from materials with excellent wear resistance, such as hardened steel or composite materials. Additionally, selecting materials with low coefficients of friction helps reduce frictional losses. Proper material selection ensures durability and minimized wear in critical components of hydraulic cylinders.

7. Maintenance and Regular Inspection:

- Regular maintenance and inspection practices are vital for identifying and addressing potential issues that could lead to increased friction and wear in hydraulic cylinders. Scheduled maintenance includes lubrication checks, seal inspections, and monitoring of clearances. By promptly detecting and rectifying any signs of wear or misalignment, hydraulic cylinders can be kept in optimal condition, minimizing friction and wear throughout their operational lifespan.

In summary, hydraulic cylinders employ various strategies to handle the challenges of minimizing friction and wear. These include proper lubrication, employing suitable surface finishes, utilizing high-quality sealing systems, ensuring proper alignment and clearances, implementing effective filtration and contamination control measures, selecting appropriate materials, and conducting regular maintenance and inspections. By implementing these practices, hydraulic cylinders can minimize friction and wear, ensuring smooth and efficient operation while extending the overall lifespan of the system.

hydraulic cylinder

Adaptation of Hydraulic Cylinders for Medical Equipment and Aerospace Applications

Hydraulic cylinders have the potential to be adapted for use in medical equipment and aerospace applications, offering unique advantages in these industries. Let's explore how hydraulic cylinders can be adapted for these specialized fields:

  1. Medical Equipment: Hydraulic cylinders can be adapted for various medical equipment applications, including hospital beds, patient lifts, surgical tables, and rehabilitation devices. Here's how hydraulic cylinders are beneficial in medical equipment:
    • Positioning and Adjustability: Hydraulic cylinders provide precise and smooth movement, allowing for accurate positioning and adjustments of medical equipment. This is crucial for ensuring patient comfort, proper alignment, and ease of use.
    • Load Handling: Hydraulic cylinders offer high force capabilities, enabling the safe handling of heavy loads in medical equipment. They can support the weight of patients, facilitate smooth transitions, and provide stability during procedures.
    • Controlled Motion: Hydraulic cylinders provide controlled and stable motion, which is essential for delicate medical procedures. The ability to adjust speed, position, and force allows for precise and controlled movements, minimizing patient discomfort and ensuring accurate treatment.
    • Durability and Reliability: Hydraulic cylinders are designed to withstand rigorous use and demanding environments, making them suitable for medical equipment applications. Their durability and reliability contribute to the long-term performance and safety of medical devices.
  2. Aerospace Applications: Hydraulic cylinders can also be adapted for aerospace applications, where lightweight yet robust systems are essential. Here's how hydraulic cylinders are advantageous in aerospace:
    • Flight Control Systems: Hydraulic cylinders play a critical role in aircraft flight control systems, including ailerons, elevators, rudders, and landing gear. They provide precise and reliable actuation, allowing pilots to control the aircraft's movements with accuracy and responsiveness.
    • Weight Optimization: Hydraulic cylinders can be designed using lightweight materials, such as aluminum alloys or composite materials, to reduce overall weight. This weight optimization is crucial in aerospace applications to enhance fuel efficiency, payload capacity, and aircraft performance.
    • Shock and Vibration Resistance: Aerospace environments involve significant shock and vibration forces. Hydraulic cylinders can be engineered to withstand these dynamic loads while maintaining performance and reliability, ensuring consistent operation even under extreme conditions.
    • Space Constraints: Hydraulic cylinders can be designed to fit within the space constraints of aircraft or spacecraft. Their compact size and flexible mounting options allow for efficient integration into the limited available space.

In summary, hydraulic cylinders can be adapted for use in medical equipment and aerospace applications, leveraging their precise positioning, load handling capabilities, controlled motion, durability, and reliability. In medical equipment, hydraulic cylinders enable comfortable patient positioning, smooth transitions, and controlled movements during procedures. In aerospace, hydraulic cylinders provide precise actuation, weight optimization, shock and vibration resistance, and space-efficient solutions. By adapting hydraulic cylinders to these specialized fields, manufacturers can meet the unique requirements and enhance the performance of medical equipment and aerospace systems.

hydraulic cylinder

What are the common signs of wear or leakage that indicate hydraulic cylinder issues?

Hydraulic cylinders are critical components in hydraulic systems, and wear or leakage can lead to performance issues and potential system failures. It is important to be aware of the common signs that indicate hydraulic cylinder problems. Here's a detailed explanation of the common signs of wear or leakage that indicate hydraulic cylinder issues:

1. Fluid Leakage:

- Fluid leakage is one of the most obvious signs of hydraulic cylinder problems. If you notice hydraulic fluid leaking from the cylinder, it indicates a seal failure or damage to the cylinder. Leaking fluid may be visible around the rod, piston, or cylinder body. It is important to address fluid leakage promptly as it can lead to a loss of system efficiency, contamination of the surrounding environment, and potential damage to other system components.

2. Reduced Performance:

- Wear or internal damage to the hydraulic cylinder can result in reduced performance. You may notice a decrease in the cylinder's force output, slower operation, or difficulty in extending or retracting the cylinder. Reduced performance can be indicative of worn seals, damaged piston or rod, internal leakage, or contamination within the cylinder. Any noticeable decrease in the cylinder's performance should be inspected and addressed to prevent further damage or system inefficiencies.

3. Abnormal Noise or Vibrations:

- Unusual noise or vibrations during the operation of a hydraulic cylinder can indicate internal wear or damage. Excessive noise, knocking sounds, or vibrations that are not typical for the system may suggest problems such as worn bearings, misalignment, or loose internal components. These signs should be investigated to identify the source of the issue and take appropriate corrective measures.

4. Excessive Heat:

- Overheating of the hydraulic cylinder is another sign of potential issues. If the cylinder feels excessively hot to the touch during normal operation, it may indicate problems such as internal leakage, fluid contamination, or inadequate lubrication. Excessive heat can lead to accelerated wear, reduced efficiency, and overall system malfunctions. Monitoring the temperature of the hydraulic cylinder is important to detect and address potential problems.

5. External Damage:

- Physical damage to the hydraulic cylinder, such as dents, scratches, or bent rods, can contribute to wear and leakage issues. External damage can compromise the integrity of the cylinder, leading to fluid leakage, misalignment, or inefficient operation. Regular inspection of the cylinder's external condition is essential to identify any visible signs of damage and take appropriate actions.

6. Seal Failure:

- Hydraulic cylinder seals are critical components that prevent fluid leakage and maintain system integrity. Signs of seal failure include fluid leakage, reduced performance, and increased friction during cylinder operation. Damaged or worn seals should be replaced promptly to prevent further deterioration of the cylinder's performance and potential damage to other system components.

7. Contamination:

- Contamination within the hydraulic cylinder can cause wear, damage to seals, and overall system inefficiencies. Signs of contamination include the presence of foreign particles, debris, or sludge in the hydraulic fluid or visible damage to seals and other internal components. Regular fluid analysis and maintenance practices should be implemented to prevent contamination and address any signs of contamination promptly.

8. Irregular Seal Wear:

- Hydraulic cylinder seals can wear over time due to friction, pressure, and operating conditions. Irregular seal wear patterns, such as uneven wear or excessive wear in specific areas, may indicate misalignment or improper installation. Monitoring the condition of the seals during regular maintenance can help identify potential issues and prevent premature seal failure.

It is important to address these common signs of wear or leakage promptly to prevent further damage, ensure the optimal performance of hydraulic cylinders, and maintain the overall efficiency and reliability of the hydraulic system. Regular inspection, maintenance, and timely repairs or replacements of damaged components are key to mitigating hydraulic cylinder issues and maximizing system longevity.
China manufacturer 50 - 800 Ton Single Acting High Tonnage Lock Nut Hydraulic Jack Hydraulic Cylinder 700 Bar Lock-Nut Hydraulic Cylinders   vacuum pump distributorsChina manufacturer 50 - 800 Ton Single Acting High Tonnage Lock Nut Hydraulic Jack Hydraulic Cylinder 700 Bar Lock-Nut Hydraulic Cylinders   vacuum pump distributors
editor by CX 2023-11-27