EAST AI Hydraulic Manufacturer
Since 2006
 |
EAST AI
4140
Max. 15m
f7/f8/g6,etc
≤0.2/1000 mm
Hydraulic cylinders for mobile equipment, industrial machinery, and heavy-duty systems
Anti rust oil to be spread on rod surface and each rod to be packed in paper roll and then in wooden case,can be customised according to customer requirements
≤0.2u
Product Description
The 4140 Chrome Plated Rod Normalized (HRC 15–22) offers a range of advantages that make it a preferred choice for hydraulic cylinder manufacturers and engineering contractors:
4140 alloy steel provides higher tensile strength and toughness compared to CK45 or ST52, making it suitable for heavy-duty applications.
Chrome plating ensures low friction, high wear resistance, and extended service life in hydraulic systems.
Normalized heat treatment gives a hardness range of HRC 15–22, providing a balance of machinability and durability.
The chrome surface layer protects against rust and environmental degradation.
Precision grinding ensures accurate tolerances for smooth cylinder operation.
Widely applicable in hydraulic cylinders, pneumatic systems, lifting machinery, and construction equipment.
The manufacturing of 4140 Chrome Plated Rod Normalized (HRC 15–22) follows strict procedures to guarantee quality and consistency:
Raw Material Selection
High-grade 4140 alloy steel is carefully sourced.
Peeling and Straightening
Surface defects are removed, and the rod is straightened to meet alignment standards.
Normalizing Heat Treatment
The rods are heated and air-cooled to refine the grain structure and achieve uniform hardness (HRC 15–22).
Centerless Grinding
Achieves precise diameter tolerance and smoothness.
Hard Chrome Plating
A uniform chrome layer is applied for surface protection and wear resistance.
Polishing and Finishing
Final polishing enhances the surface roughness to meet hydraulic system requirements.
Inspection and Testing
Each rod undergoes mechanical, dimensional, and surface quality checks before dispatch.
This process ensures every rod meets the strict demands of engineering projects.
The 4140 Chrome Plated Rod Normalized (HRC 15–22) is suitable for various industries where durability, strength, and reliability are essential:
Main piston rods in construction machinery, excavators, and forklifts.
Applications requiring lightweight but strong components.
Press machines, lifting equipment, and automated systems.
Hydraulic arms and implements in tractors and harvesters.
Corrosion-resistant piston rods for offshore machinery.
Heavy-duty piston rods used in hydraulic drilling rigs and loaders.
This wide application range makes it an attractive stock option for distributors and suppliers.
| Parameter | Specification |
|---|---|
| Material | 4140 Alloy Steel |
| Condition | Normalized |
| Hardness | HRC 15–22 |
| Surface Coating | Hard Chrome Plated |
| Surface Roughness | Ra ≤ 0.2 µm |
| Tolerance | f7 / h8 |
| Chrome Layer Thickness | 20–30 µm |
| Straightness | ≤ 0.2 mm/m |
| Diameter Range | Ø 6 mm – Ø 350 mm |
| Length | Up to 8000 mm |
These specifications ensure compatibility with a wide range of hydraulic and pneumatic systems.
Our factory maintains a large inventory of 4140 Chrome Plated Rod Normalized (HRC 15–22) in various diameters and lengths. This enables:
Stock availability shortens lead times for urgent projects.
From bulk distributor orders to small engineering requirements.
Cutting and machining services available upon request.
Distributors and stockists benefit from reliable supply and consistent quality, ensuring that end-users receive the products they need without delays.
Every 4140 Chrome Plated Rod Normalized (HRC 15–22) undergoes a series of inspections to ensure compliance with international standards:
Verifying HRC 15–22 range after normalizing treatment.
Ensures corrosion resistance of the chrome plating.
Detects internal cracks or defects.
Checks for chrome uniformity and roughness levels.
Ensures proper alignment for hydraulic system function.
Confirms tolerance compliance (f7 / h8).
These strict testing procedures guarantee reliability and long service life.
Our 4140 Chrome Plated Rod Normalized (HRC 15–22) is supplied with recognized certifications, providing trust and assurance to distributors, stockists, and engineering companies:
Confirms chemical composition and mechanical properties.
Ensures standardized production control.
SGS, BV, or other organizations upon request.
Certification for marine and offshore applications.
These certificates strengthen confidence for global distribution and engineering use.
