Hydraulic cylinder

alloysteelDIN 3358

Product Overview
EASTAI welded hydraulic cylinders are space-efficient, high-performance actuators designed for heavy-duty mobile and industrial hydraulic systems. The welded barrel and end-cap construction removes the need for tie rods, improving structural stiffness and vibration resistance. These cylinders are specified for construction, agriculture, mining, material handling and marine applications. Available bore sizes: 25 mm to 500 mm; stroke up to 6000 mm; working pressure up to 35 MPa; manufactured to ISO and DIN standards.

Advantages of Welded Hydraulic Cylinder

• Compact, space-saving design — Welded end-cap construction eliminates external tie rods to reduce overall envelope and simplify installation in confined spaces.
• High structural strength — Welded barrel and end caps form a monolithic body that withstands high working pressures and side loads without deformation.
• Reliable sealing — Double-lip or multi-stage sealing systems minimize internal and external leakage for long-term stable operation.
• Smooth, low-friction operation — Honed tubes and hard chrome-plated rods provide excellent surface finish, low friction and high wear resistance.
• Customizable configuration — Bore, stroke, mounting style and port locations can be tailored to machine requirements.
• Long service life and low maintenance — Robust materials, welding and quality components extend lifecycle and reduce downtime.

Manufacturing Process

• Material selection — High-strength alloy steels and seamless honed tubes chosen per application (common grades: ST52, CK45, 27SiMn).
• Tube finishing — Precision honing or skived & roller burnishing to achieve tight dimensional tolerance and mirror-like surface.
• Rod chrome plating — Piston rods induction-hardened and plated with 20–30 μm hard chrome for corrosion and wear resistance.
• Welding and assembly — End caps, ports and mounts welded with automated MIG/TIG equipment to ensure consistent penetration and joint strength.
• Heat treatment — Post-weld stress relief and normalization for dimensional stability and toughness.
• Painting and surface protection — Anti-rust oil plus epoxy or polyurethane coating for corrosion protection.
• Final testing — Each cylinder pressure-tested to 125% of rated pressure and inspected for leakage and dimensional accuracy.

Product Details

• Product Name — Welded Hydraulic Cylinder
• Bore Size — 25 mm – 500 mm
• Stroke Length — Up to 6000 mm
• Working Pressure — Up to 35 MPa
• Materials — ST52, CK45, 27SiMn, alloy steel
• Surface Finish — Honed or Skived & Roller Burnished tube; hard chrome-plated rod (20–30 μm)
• Seal Brands — Parker / Hallite / NOK
• Welding — Automatic MIG / TIG
• Mounting Types — Clevis, Trunnion, Flange, Eye mount
• Coating — Epoxy or polyurethane
• Testing — Pressure test, leakage test, dimensional inspection
• Certification — ISO 9001, GL AMM, SGS
• Delivery Time — 7–15 days for standard models
• OEM Service — Available

Applications

• Construction equipment — Excavators, bulldozers, loaders, dump trucks, compactors.
• Agricultural machinery — Tractors, harvesters, sprayers, balers.
• Mining equipment — Underground loaders, drilling rigs, crushers, haul trucks.
• Industrial systems — Hydraulic presses, material handling systems, machine tools.
• Marine and offshore — Deck machinery, cranes, lifting platforms.
• Renewable energy — Wind turbine pitch control and hydraulic locking systems.

Factory Inventory and Production Capacity
EASTAI maintains extensive raw material stock (over 10,000 tonnes) and a factory area exceeding 8,000 m² to support rapid order fulfillment. Production capacity exceeds 50,000 cylinders per year with integrated CNC machining, automated welding lines, honing equipment and hydraulic test stations to ensure global quality compliance.

Quality Control and Inspection

• Incoming material inspection — Chemical composition and mechanical property verification for tubes and rods.
• Process inspection — Dimensional and surface accuracy checks during honing, welding and machining.
• Pressure testing — Each cylinder tested at 1.25× working pressure for leak and performance verification.
• Surface treatment testing — Salt spray and coating adhesion tests.
• Final inspection — Full traceability and test reports provided per batch.

Certifications

• ISO 9001 Quality Management System
• GL AMM (Germanischer Lloyd Approval of Material Manufacturers)
• SGS material and dimensional inspection reports
• CE compliance for export markets

Technical Specifications

• Bore size: 25 mm – 500 mm
• Stroke length: Up to 6000 mm
• Working pressure: Up to 35 MPa
• Materials: ST52, CK45, 27SiMn, alloy steel
• Surface finish: Honed or Skived & Roller Burnished tube; hard chrome-plated rod (20–30 μm)
• Seal brands: Parker / Hallite / NOK
• Welding: Automatic MIG / TIG
• Coating: Epoxy or polyurethane with anti-rust treatment
• Testing: Pressure test to 125% rated pressure, leakage and dimensional inspection
• Delivery time (standard models): 7–15 days
• OEM service: Available