Tightening Oil Cylinder
Product description:

hydraulic cylinders are actuators that convert hydraulic energy into linear mechanical force. They have a compact structure, high output force, and smooth operation. They are the core components for performing actions such as pushing, pulling, lifting, and pressing in various mechanical and industrial systems, and are widely used in construction machinery, metallurgy, mining, shipping, and other fields.

A Tightening oil cylinder, also known as a hydraulic tightening cylinder or hydraulic tensioning actuator, is a precision hydraulic component used to apply controlled axial force or tension in various mechanical systems. It is widely used in construction machinery, bridge equipment, steel structure assembly, wind power installations, shipbuilding, and industrial manufacturing.

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Structure and Working Principle

The tightening oil cylinder consists of a hydraulic cylinder body, piston, piston rod, sealing system, pressure port, and coupling interface. When high-pressure hydraulic oil is pumped into the cylinder chamber, it drives the piston to extend, applying tension or tightening force to the connected bolt or rod.

Once the desired force is reached, the mechanical system can be locked or fastened securely, and the hydraulic pressure can be released without losing preload. This design ensures precise control over tightening force, high repeatability, and safe operation even under extreme load conditions.

Materials and Manufacturing Process

• To ensure durability and high performance, the cylinder barrel is made from high-strength alloy steel or heat-treated Precision steel tubes with a honed internal surface for smooth motion and minimal friction. The piston rod is hard chrome plated or treated with QPQ nitriding, providing excellent wear resistance, corrosion protection, and long service life.
• The entire manufacturing process employs CNC machining, robotic welding, precision grinding, and automated heat treatment, ensuring dimensional accuracy, high strength, and leak-free operation. Each tightening oil cylinder is assembled under strict quality standards to meet the requirements of high-pressure and high-precision applications.

Features and Advantages

• High Precision Force Control: Provides accurate and repeatable tightening or tensioning force for critical structural applications.
• High Pressure Capacity: Designed to operate under working pressures up to 70 MPa or more, suitable for heavy-duty industrial use.
• Superior Sealing System: Equipped with premium seals from brands like NOK, Hallite, or Parker, ensuring zero leakage and smooth operation.
• Robust and Durable Construction: Made from high-strength materials to resist wear, corrosion, and fatigue under continuous use.
• Compact and Lightweight Design: Optimized for easy installation, portability, and use in confined spaces.
• Customizable Options: Available in different bore sizes, stroke lengths, pressure ratings, and connection designs according to customer requirements.
• Easy Maintenance: Simple structure and replaceable components make servicing and seal replacement quick and convenient.

Working principle of hydraulic cylinder:

Applications:

The hydraulic cylinder is an energy conversion device that converts hydraulic energy into mechanical energy. It is the core executive component in the hydraulic system. The hydraulic cylinder uses hydraulic oil to drive the piston to move, converting hydraulic energy into linear reciprocating motion. When the hydraulic oil enters the cylinder barrel, it pushes the piston rod to extend or retract, completing the predetermined action. The direction and speed of its movement are regulated by the hydraulic control system. The hydraulic cylinder consists of a cylinder barrel, cylinder cover, piston and piston rod, sealing device, and buffering device. According to its structure, it can be classified as piston type, plunger type, multi-stage telescopic sleeve type, and gear rack type. Hydraulic cylinders are widely used in machine tools, construction machinery, vehicles, and other fields, featuring a simple structure and smooth movement.

The tightening oil cylinder is used in a wide range of industries and applications, including:

• Bridge and steel structure assembly – for bolt and cable tensioning.
• Wind turbine and tower installation – to secure large bolts and structural joints.
• Heavy machinery and mining equipment – for clamping, pressing, and structural fastening.
• Shipbuilding and offshore engineering – for high-strength tightening operations under marine conditions.
• Industrial maintenance and repair – for disassembly, torque control, and precise preload adjustment.
• In each of these areas, the tightening oil cylinder delivers powerful, controlled, and reliable hydraulic force, ensuring safe and efficient mechanical performance.

Quality Control and Testing

Every cylinder undergoes strict inspection and hydraulic testing before delivery. Quality assurance includes:

Pressure and leakage testing under rated loads

Dimensional accuracy verification

Coating adhesion and corrosion resistance testing

Fatigue and endurance testing for long-term reliability

All products comply with ISO, DIN, and CE standards, guaranteeing consistent performance and safety in demanding industrial environments.

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Why us?

We focus on the research, development, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders. We have a complete production chain and an advanced equipment system, including piercing machines, cold drawing machines, hot rolling machines, high-precision flaw detection and testing equipment. The company has passed multiple authoritative certifications such as ISO9001, API, SGS, CCS, DNV, ABS, CE, RoHS, etc., ensuring that each product complies with international standards. We are committed to providing customers with high-quality, customizable solutions to meet diverse application needs.

Relying on our own built processing base and modern workshops, combined with multiple branches and storage centers across the country, we have achieved sufficient inventory and efficient logistics coordination, significantly shortening the delivery cycle and ensuring the rapid delivery of orders.

We have established a complete service and support system. After the order is signed, the professional after-sales team can provide timely and safe on-site guidance and technical support to ensure that customers are at ease throughout the process from procurement to use.

FAQ:

1. Do you support customized design and production?

Sure. We have a professional engineering team that can conduct customized design and production with special sizes, control systems or OEM according to your requirements.

2. How fast can you deliver?

In stock sizes, it takes 3-5 days. For customized sizes, it takes 30-35 days.

3. What payment methods do you support?

We support TT payment. Generally, 30% to 50% of the payment is made in advance, and the remaining amount is paid before shipment.

4. Can you provide material certification (MTC)?

Yes, we will provide MTC to you after production is completed to ensure that the material quality meets the standards.

5. What is the minimum order quantity?

Generally, we accept trial orders. The minimum order quantity is 1-3 tons, which can be determined according to different products.