Product description:

The piston rod is a connecting component that supports the piston in performing work. It is mostly used in oil cylinders and air cylinders as motion execution components and is a frequently moving and highly technical motion component. Taking the hydraulic cylinder as an example, it is composed of the cylinder barrel, piston rod (oil Cylinder rod), piston, and end cover. The quality of its processing directly affects the lifespan and reliability of the entire product. The processing requirements for the piston rod are high. Its surface roughness should be within the range of Ra0.4 to 0.8 μm, and strict requirements are imposed on coaxiality and wear resistance.

A Cylinder piston tube—also known as a hydraulic cylinder tube or pneumatic cylinder barrel—is a precision-engineered component used in hydraulic and pneumatic systems to guide the piston’s linear motion and contain pressurized fluid or air. It serves as the working chamber of the cylinder, where energy is converted into mechanical force. The quality, precision, and surface finish of the cylinder piston tube directly influence the performance, efficiency, and lifespan of the entire cylinder assembly.

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Material and Structure

Cylinder piston tubes are typically manufactured from high-quality seamless steel tubes such as ST52, E355, AISI 1020, AISI 1045, or AISI 4140, depending on the specific pressure and environmental requirements. In applications requiring corrosion resistance, stainless steel grades such as AISI 304, 316, or 316L are used. These materials provide excellent mechanical strength, machinability, and fatigue resistance, allowing the tubes to withstand high pressure and constant reciprocating movement.

The inner surface of a cylinder piston tube is honed or skived and roller-burnished, achieving an ultra-smooth finish that reduces friction and improves sealing performance. The typical surface roughness is Ra ≤ 0.2 μm, and dimensional tolerances are precisely controlled to ensure perfect compatibility with the piston and sealing components.

Manufacturing Process

The production of a cylinder piston tube involves multiple precision stages to achieve optimal quality and performance:

Material Selection: Choose seamless steel tubes with high purity and uniform microstructure.

Cold Drawing: Refine the dimensional accuracy and mechanical properties of the tube.

Heat Treatment: Processes such as normalizing or quenching and tempering enhance hardness and toughness.

Honing or Skiving & Roller Burnishing: Create a mirror-smooth internal surface to reduce friction and wear.

External Machining: The outer surface may be machined to tight tolerances for cylinder assembly.

Surface Coating (Optional): Apply corrosion-resistant coatings such as nickel or phosphate for additional protection.

Final Inspection: Each tube undergoes non-destructive testing (NDT), dimensional verification, and surface quality inspection.

Key Features and Advantages

High Dimensional Accuracy: Ensures perfect piston movement and efficient sealing.

Smooth Inner Surface: Minimizes friction and wear, improving operational life.

Superior Strength and Toughness: Handles high-pressure hydraulic or pneumatic loads.

Corrosion Resistance: Optional coatings and stainless-steel grades extend lifespan in harsh environments.

Excellent Straightness and Roundness: Achieved through advanced honing and grinding technology.

Customizable Sizes: Available in various diameters, wall thicknesses, and lengths to meet diverse industrial needs.

Production process of the piston rod:

Applications:

The hydraulic cylinder is an energy conversion device that converts hydraulic energy into mechanical energy. It is the core actuating 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.

Cylinder piston tubes are widely used in a variety of industries and equipment, including:

Hydraulic cylinders for construction machinery, excavators, and cranes

Pneumatic cylinders in automation and robotic systems

Industrial machinery such as injection molding machines and hydraulic presses

Agricultural and forestry equipment

Marine and offshore applications requiring corrosion resistance

Aerospace and automotive systems that demand high precision and strength

These tubes operate under high pressure and continuous reciprocating motion, making their internal finish and dimensional precision critical to system performance and efficiency.

Company profile:

Since its establishment in 2014, Wuxi Hengxin Zhicheng Co., Ltd. has rapidly grown into a leading enterprise in the steel manufacturing industry. We focus on the research, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders, and are committed to providing customers with high-quality, customizable products that fully meet diverse application needs.

Our products are exported to global markets such as the Middle East, South America, Africa, and Southeast Asia, and are highly trusted by large purchasers and customers in the steel industry. We always prioritize quality, reliability and customer service, and attach great importance to establishing long-term and stable cooperative relationships with customers. We provide each customer with tailor-made solutions.

We continuously promote technological innovation and improve service capabilities and production efficiency. Through an efficient online platform, you can browse our best-selling products at any time and communicate with the sales and support teams in real time to conveniently obtain the information you need. We sincerely invite partners from all countries to visit, exchange and provide guidance, and jointly explore more possible cooperation opportunities!

Certification:

Packaging and Transportation:

【Package standard】

We use steel bands to tightly package the products into hexagonal bundles. The structure is stable and not prone to deformation. Each bundle is equipped with two high-strength nylon straps to ensure the safety and convenience of the lifting operation.

To meet various maritime transportation needs, we offer a range of customized packaging options, including full coverage with oilcloth, moisture-proof wooden boxes, and high-strength protective frame packaging, to ensure the maximum safety of goods during transportation.

【Guarantee for transportation】

We offer 20-foot and 40-foot standard container transportation services. Each container can carry up to 25 tons of goods and we can accept trial orders with a minimum of 5 tons. This allows for flexible adaptation to your purchasing scale. All packaging complies with maritime shipping standards to ensure that the goods are delivered to the destination efficiently and safely.

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.