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 hollow piston rod is a precision-engineered mechanical component widely used in hydraulic cylinders, pneumatic systems, and industrial machinery. Unlike a traditional Solid piston rod, the hollow piston rod features a central bore running along its axis, significantly reducing its overall weight while maintaining high strength and rigidity. This unique structure provides superior performance in applications that demand lightweight yet durable motion control components.

The hollow piston rod is typically manufactured from high-quality alloy steel, carbon steel, or stainless steel materials such as AISI 4140, AISI 1045, or ST52. These materials are heat-treated, quenched, and tempered to achieve excellent mechanical properties, including high tensile strength, impact resistance, and superior surface hardness. In addition, precision machining and hard chrome plating or nickel plating are applied to the outer surface to enhance wear resistance and corrosion protection, ensuring a long service life even in harsh environments.

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Advantages of Hollow Piston Rods

Lightweight Design – The hollow structure reduces weight without compromising strength, improving equipment energy efficiency and dynamic response.

High Strength-to-Weight Ratio – Advanced materials and optimized geometry provide excellent load-bearing capacity while minimizing inertia.

Improved Oil Flow and Cooling – The inner bore can serve as a passage for hydraulic oil, enabling better heat dissipation and smoother operation.

Enhanced Corrosion Resistance – Surface treatments such as chrome plating and polishing protect against rust and extend service life.

Cost Efficiency – Reduced material consumption and improved energy efficiency lower overall operational costs.

Manufacturing Process

The production of a hollow piston rod involves several precision-controlled steps:

Material Preparation: High-grade seamless steel tubes are selected and cut to required lengths.

Deep Hole Boring: The internal bore is machined with specialized tools to ensure smoothness and concentricity.

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

CNC Machining: Ends are precision-machined to fit piston heads, threads, and mounting accessories.

Surface Plating: Hard chrome or nickel coatings are applied for enhanced wear and corrosion resistance.

Polishing and Inspection: The rod undergoes fine polishing and quality inspection for straightness, tolerance, and surface roughness (Ra ≤ 0.2 μm).

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.

Hollow piston rods are essential in:

Hydraulic cylinders for excavators, cranes, and industrial presses

Pneumatic cylinders in automation systems and robotics

Automotive shock absorbers and suspension systems

Marine and offshore equipment where corrosion resistance is critical

Aerospace and energy sectors requiring high-performance lightweight components

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!

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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.