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 Hydraulic cylinder piston rod is one of the most essential components in any hydraulic system. It plays a key role in converting hydraulic pressure into mechanical force, enabling linear motion and power transmission in various industrial and mobile applications. The piston rod connects the hydraulic cylinder’s piston to the external mechanism, transmitting the generated force smoothly and accurately. Its quality, precision, and durability directly affect the performance, efficiency, and lifespan of the entire hydraulic cylinder assembly.

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Material and Construction

Hydraulic cylinder piston rods are manufactured from high-strength carbon steel (C45 / AISI 1045), alloy steel (AISI 4140 / 42CrMo4), or stainless steel (AISI 304 / 316). These materials provide excellent tensile strength, fatigue resistance, and toughness required for high-pressure applications. For corrosive or outdoor environments, stainless steel and nickel-chrome plated rods are preferred to ensure superior corrosion resistance and long-term reliability.

The piston rod surface undergoes hard chrome plating, forming a dense, smooth, and wear-resistant coating. This layer enhances surface hardness (HRC 60–65), reduces friction, and protects against rust, abrasion, and contaminants. Combined with precision grinding and mirror polishing, the hydraulic cylinder piston rod achieves an ultra-smooth finish (Ra ≤ 0.2 μm), ensuring low seal wear and extended service life.

Manufacturing Process

The production of a hydraulic cylinder piston rod involves multiple precision-controlled steps to ensure consistent performance and quality:

Material Selection: Choose high-grade steel bars with excellent mechanical properties and uniform structure.

Heat Treatment: Quenching and tempering processes increase core strength, impact resistance, and fatigue life.

CNC Machining: Ends are machined to tight tolerances for threading, grooves, and fittings.

Centerless Grinding: Achieves perfect roundness, straightness, and dimensional accuracy.

Hard Chrome Plating: A 20–30 μm layer of chrome provides wear and corrosion protection.

Mirror Polishing: Produces a highly reflective surface for low friction and smooth operation.

Quality Inspection: Every rod undergoes tests for straightness, coating thickness, hardness, and tolerance precision.

Key Features and Advantages

High Strength and Rigidity: Designed to withstand heavy loads and hydraulic pressure.

Excellent Surface Quality: Minimizes friction and extends seal life.

Superior Corrosion Resistance: Chrome or nickel plating ensures long-term protection.

High Fatigue Resistance: Maintains stability under cyclic loading.

Dimensional Accuracy: Tight tolerances guarantee smooth piston and cylinder operation.

Customizable Options: Available in various diameters, coatings, and lengths to meet specific hydraulic requirements.

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.

Hydraulic cylinder piston rods are widely used in a broad range of industries and machinery, including:

Construction Equipment: Excavators, bulldozers, loaders, and cranes

Agricultural Machinery: Tractors, harvesters, and sprayers

Industrial Automation: Press machines, molding equipment, and material handling systems

Marine and Offshore Equipment: Deck cranes, steering systems, and hydraulic stabilizers

Mining and Drilling Machines: Hydraulic booms, drills, and support cylinders

Automotive and Transport Equipment: Hydraulic lifts, brakes, and suspension systems

These applications require piston rods that can operate under extreme pressure, heavy load, and constant motion while maintaining smooth and precise performance.

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.