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 Pneumatic piston rod is a critical component of a pneumatic cylinder system, responsible for converting compressed air energy into linear mechanical motion. It connects the piston inside the cylinder to the external load or mechanism, transferring the generated force smoothly and efficiently. As an essential part of pneumatic actuators used in automation, manufacturing, and machinery systems, the quality and precision of the pneumatic piston rod directly affect the cylinder’s performance, durability, and reliability.

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Structure and Material

The pneumatic piston rod is typically made from high-quality materials such as carbon steel (C45 / AISI 1045), alloy steel (AISI 4140 / 42CrMo), or stainless steel (AISI 304 / 316), depending on the application environment. These rods undergo precision machining, hard chrome plating, and mirror polishing to achieve excellent surface quality and dimensional accuracy. For applications that require corrosion resistance—such as food processing, chemical plants, or marine environments—stainless steel pneumatic piston rods are often preferred due to their superior anti-rust properties.

The surface of a pneumatic piston rod is generally treated with a hard chrome layer (20–30 μm thick), which significantly improves surface hardness, reduces friction, and enhances wear resistance. The combination of material strength and surface protection ensures stable operation and a long service life under continuous air pressure cycles.

Key Features and Advantages

High Surface Smoothness – Achieves Ra ≤ 0.2 μm for minimal seal wear and smooth operation.

Corrosion Resistance – Chrome or nickel plating prevents rust and degradation in humid or chemical environments.

High Dimensional Accuracy – CNC machining ensures precise tolerances for perfect fit with cylinder bores and seals.

Fatigue and Impact Resistance – Quenched and tempered materials withstand high-frequency reciprocating motion.

Long Service Life – Enhanced coating adhesion and hardness reduce maintenance and replacement frequency.

Customizable Design – Available in a variety of diameters, lengths, and coatings for different pneumatic applications.

Manufacturing Process

The production of pneumatic piston rods follows a series of precision steps to guarantee quality and performance:

Material Preparation: Selected high-grade steel rods or bars are cut to specified lengths.

Heat Treatment: Quenching and tempering improve toughness and fatigue resistance.

CNC Machining: Threaded ends, grooves, and shoulders are accurately machined for precise assembly.

Centerless Grinding: Ensures high straightness and smooth surface finish.

Hard Chrome Plating: A dense layer of chrome increases surface hardness (up to HRC 60–65).

Mirror Polishing: Final finishing produces an ultra-smooth reflective surface.

Quality Inspection: Each rod undergoes testing for straightness, coating thickness, surface hardness, and tolerance accuracy.

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.

Pneumatic piston rods are widely used in:

Automation equipment and robotic actuators

Packaging machines and conveyor systems

Textile and printing machinery

Food and pharmaceutical processing equipment

Material handling systems and assembly lines

Pneumatic valves, grippers, and positioning devices

In industries where high-speed reciprocating movement and precise control are essential, the pneumatic piston rod ensures consistent operation and high efficiency. It plays a vital role in enhancing productivity and reducing downtime in modern automated production systems.

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.