Steel round rod

for machiningconstructionfor general purposes

Product Overview
The 4140 Chrome Plated Rod — Induction Hardened (HRC 50–62) is a high-strength piston rod manufactured from 4140 alloy steel (42CrMo4 equivalent). It combines induction surface hardening with hard chrome plating (20–30 μm typical) to deliver enhanced fatigue resistance, wear and corrosion protection, low friction for hydraulic seals, and excellent straightness for demanding hydraulic and mechanical applications.

Product Details

• Model: Induction And Hardened
• Brand: EAST AI
• Material: 4140 alloy steel
• Length: up to 15 m (standard 1–8 m; custom lengths available)
• Application: Hydraulic cylinders for mobile equipment, industrial machinery and heavy-duty systems
• Packing: Anti-rust oil on rod surface; each rod wrapped in paper and packed in wooden case; custom export packaging available
• Roughness: Ra ≤ 0.2 μm

Key Features

• 4140 alloy (42CrMo4) with high tensile strength and excellent fatigue resistance
• Induction hardened surface (HRC 50–62) to improve wear, bending and impact resistance and extend fatigue life
• Hard chrome plating (20–30 μm typical, customizable) for low roughness, corrosion protection and reduced friction for seals
• Precision ground and polished to tight tolerances (f7 / f8 / g6 available), high straightness and mirror finish
• Designed for long service life under repeated heavy loads and high pressure

Applications

• Hydraulic cylinder piston rods: excavators, loaders, backhoes, mining hydraulics, industrial presses
• Construction & heavy machinery: cranes, bulldozers, drilling rigs, tunnelling equipment
• Agriculture & forestry: harvesters, log splitters, tractor hydraulics
• Material handling & lifting: forklifts, aerial platforms, telescopic boom cylinders
• Industrial automation: linear actuators, precision shafts, high-frequency reciprocating systems

Quality Control
Each rod is inspected using ultrasonic flaw detection, hardness testing (HRC verification), chrome thickness measurement, salt spray corrosion testing, surface roughness measurement, dimensional tolerance checks and straightness verification to ensure consistent mechanical properties and minimal defect rates.

Customization Options

• Custom diameters: φ 8–200 mm
• Special tolerance classes (g6 / h7 available)
• Extra-thick chrome plating options
• Cut-to-length or long-length rods
• End machining: threading, turning, drilling, chamfering
• Specialized export packaging

Technical Specifications

• Material Grade: 4140 Alloy Steel (42CrMo4 / SCM440 equivalent)
• Surface Treatment: Hard chrome plating
• 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 / 1 m
• Yield Strength: ≥ 850 MPa
• Tensile Strength: 1000–1200 MPa
• Standard Lengths: 1–8 m (custom lengths available)
• Surface Process: Precision grinding + polishing + chrome plating
• Machining Options: Threading, drilling, chamfering, end machining