Steel round rod

for machiningfor general purposeshigh-strength

Product Overview
High-strength SAE 4140 alloy steel hollow rod with hard chrome plating designed for hydraulic cylinders and heavy-duty industrial applications. Hollow internal diameter reduces weight while maintaining required mechanical properties. Precision chrome thickness, surface finish and customizable dimensions meet distributor and OEM requirements.

Key Features

• Brand: EAST AI
• Material: 4140 alloy steel (SAE 4140)
• Available length: up to 15 m (customizable)
• Hollow internal ID for reduced weight
• ID tolerance options: f7, f8, g6, etc.
• Straightness: ≤ 0.2 mm per 1000 mm
• Surface roughness: Ra ≤ 0.2 µm
• Surface finish: hard chrome plated, mirror-like
• Chrome plating thickness: 20–100 µm (precision plating)
• Packing: anti-rust oil on surface; each rod wrapped in paper and packed in wooden case; customizable

Advantages

• High strength due to SAE 4140 alloy composition
• Corrosion and wear resistance provided by hard chrome plating
• Weight reduction compared with solid rods because of hollow ID
• Cost-effective alternative to solid piston rods
• Customizable sizes and tolerances to fit diverse industrial applications

Applications

• Hydraulic cylinder piston rods
• Construction and mining equipment
• Agricultural machinery
• Lifting and material handling systems
• Marine and offshore engineering
• General industrial and heavy-duty systems

Production Process

• Raw material selection: SAE 4140 alloy steel with strict inspection
• Cold drawing and heat treatment to achieve specified mechanical properties
• Turning and grinding to exact dimensions
• Hard chrome plating to specified thickness and finish
• Quality testing: hardness, straightness, surface roughness, chrome thickness and adhesion checks

Product Parameters (table)
Material: 4140 Alloy Steel
Hardness: HRC 15–62
Length: Up to 15 meters (customizable)
Surface Roughness: Ra ≤ 0.2 µm
Straightness: ≤ 0.2 mm per 1000 mm
Surface Finish: Chrome plated, mirror-like

Technical specifications

• Material: SAE 4140 alloy steel
• Hardness range: HRC 15–62
• Maximum length: 15 m (custom lengths available)
• Internal hollow ID design (reduces weight vs solid rods)
• ID tolerance options: f7, f8, g6, etc.
• Straightness tolerance: ≤ 0.2 mm per 1000 mm
• Surface roughness: Ra ≤ 0.2 µm
• Surface finish: hard chrome plated, mirror-like
• Chrome plating thickness: typically 20–100 µm
• Packing: anti-rust oil, paper wrap, wooden case (customizable)
• Typical applications: hydraulic cylinders (mobile equipment and industrial machinery), construction/mining/agriculture, lifting systems, marine/offshore