EAST AI Hydraulic Manufacturer
Since 2006
 |
Induction And Hardened
EAST AI
4140
max 15m
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
Ra≤0.2u
Product Description
4140 alloy steel delivers:
High tensile strength
Excellent fatigue resistance
Good ductility and toughness
Strong performance under variable loads
The rod surface undergoes induction hardening, reaching HRC 50–62, significantly improving:
Wear resistance
Bending and impact resistance
Fatigue life under high stress
Resistance to scoring and pitting
The chrome layer offers:
Low surface roughness (Ra ≤ 0.2 μm)
Excellent corrosion protection
Smooth movement inside hydraulic seals
High resistance to abrasion
Manufactured with high-precision equipment to ensure:
Accurate tolerances (f7 / f8 / g6 available)
Excellent straightness
Mirror-like finish
Ideal for applications where repeated heavy loads, high pressure, and harsh environments require strong and durable components.
The rod is engineered for high-demand industries that require superior strength and wear resistance:
Excavators
Loaders
Backhoe machines
Mining hydraulics
Industrial hydraulic presses
Cranes
Bulldozers
Drilling rigs
Tunneling machinery
Harvesters
Log splitters
Tractor hydraulic systems
Forklifts
Aerial platforms
Lifting cranes
Telescopic boom cylinders
Linear actuators
Precision mechanical shafts
High-frequency reciprocating systems
| Item | Specification |
|---|---|
| Material Grade | 4140 Alloy Steel (42CrMo4 / SCM440 equivalent) |
| Surface Treatment | Hard Chrome Plated |
| Induction Hardened Hardness | HRC 50–62 |
| Core Hardness | HRC 28–35 |
| Surface Hardness | 850–1050 HV |
| Chrome Thickness | 20–30 μm (customizable) |
| Surface Roughness | Ra ≤ 0.2 μm |
| Diameter Tolerance | f7, g6, h7 (optional) |
| Straightness | ≤ 0.2 mm / 1m |
| Yield Strength | ≥ 850 MPa |
| Tensile Strength | 1000–1200 MPa |
| Standard Lengths | 1–8 meters (custom lengths available) |
| Surface Process | Precision grinding + polishing + chrome plating |
| Features | High strength, wear-resistant, corrosion-resistant |
| Machining Options | Threading, drilling, chamfering, end machining |
4140 alloy steel offers superior mechanical properties and longer service life.
Resistance to wear
Less bending
Better impact resistance
Improved fatigue strength
Ideal for extreme working conditions.
The uniform chrome layer protects against:
Corrosion
Abrasion
Chemical exposure
Seal wear
The rod resists damage, reducing cylinder repair and replacement frequency.
With high yield strength and a hardened surface, the rod performs reliably in high-pressure hydraulic cylinders.
High strength alloy steel (4140)
Induction hardened HRC 50–62
Smooth chrome plated finish
Superior load-bearing capacity
Long operational life
Excellent straightness and dimensional accuracy
Suitable for demanding outdoor and industrial environments
Every rod undergoes the following tests:
✔ Ultrasonic flaw detection
✔ Hardness test (HRC verification)
✔ Chrome thickness test
✔ Salt spray corrosion test
✔ Surface roughness test
✔ Dimensional tolerance check
✔ Straightness verification
We guarantee stable mechanical properties and minimum defect rates.
We offer full customization based on your requirements:
Custom diameter (φ 8–200 mm)
Special tolerance classes (g6 / h7)
Extra-thick chrome plating
Cut-to-length or long-length rods
End machining (threading, turning, drilling)
Special packaging for export
Send your drawings, and we can produce based on OEM or tailored specifications.
To receive a quotation, please provide:
Diameter
Length
Quantity
Tolerance requirement
Chrome thickness
Any machining details
Our engineering and sales team will respond with price, delivery time, and export solutions.
