Hydraulic cylinder

telescopicwith piston roddouble-acting

Overview
The three-stage telescopic cylinder by EAST AI is engineered for applications requiring long extension from a compact installation envelope. Its three nested stages extend sequentially to deliver extended stroke while minimizing retracted length. Constructed from seamless honed tubes and induction-hardened, hard-chrome plated rods, the cylinder is suited for heavy-duty hydraulic systems in construction, mining, material handling and transport industries.

Designation

• Model: Telescopic Type
• Brand: EAST AI

Key benefits

• Compact retracted length — Ideal where installation space is limited.
• Extended stroke capability — Up to 3–4× the stroke of single-stage cylinders.
• High load handling — Designed for heavy lifting and high-pressure operation.
• Durability — Induction-hardened, hard chrome-plated rods and precision seals increase service life.
• Versatility — Available in single-acting and double-acting configurations.
• Leak-minimizing design — Advanced sealing systems reduce leakage risk.
• Customization — Bore sizes, stroke lengths and mounting styles configurable to equipment needs.

Manufacturing process

• Raw material selection — Premium steels (ST52, CK45, 42CrMo4) are used.
• Tube processing — Seamless tubes cold-drawn and honed for optimal internal finish.
• Rod processing — Induction-hardening and hard chrome plating for corrosion and wear resistance.
• Stage assembly — Precision machining ensures smooth sequential extension.
• Seal installation — High-performance seals installed (brand options available).
• Welding & machining — End caps and mounts welded and machined to specification.
• Pressure testing — Hydrostatic tests confirm strength and leak-free operation.
• Surface treatment — Powder coating, phosphating or painting for enhanced durability.
• Final inspection — Dimensional checks, hardness and surface roughness validation.

Applications

• Construction machinery (dump trucks, tippers, loaders)
• Mining equipment (haul units, drilling rigs, rock-breakers)
• Agricultural machinery (trailers, harvesters, sprayers)
• Material handling (cranes, forklifts, lifting platforms)
• Transport & logistics (garbage trucks, cargo lifts, telescopic booms)
• Industrial systems (presses, automated systems, marine equipment)

Product details (specification)
Specification — Details
Bore size range — 50 mm – 400 mm
Stroke length — Up to 7000 mm
Number of stages — Three (customizable)
Working pressure — Up to 300 bar
Material — ST52 / CK45 / 42CrMo4
Rod surface — Hard chrome plated, induction hardened
Seal brand — Parker / Hallite / NOK (optional)
Temperature range — -30°C to +120°C
Mounting options — Trunnion, Clevis, Flange, Eye, Lug mounting
Standard — ISO 6022 / DIN or custom

Factory inventory

• Stock of honed tubes and chrome rods in standard sizes.
• Semi-finished telescopic stages for rapid customization.
• Finished cylinders of common models for immediate delivery.
• Monthly production capacity exceeding 8,000 hydraulic cylinders.
• Special packaging to protect cylinders in storage and transit.

Quality control

• Dimensional tolerance checks for bore, rod and stroke.
• Surface roughness testing of honed tubes for seal compatibility.
• Hardness testing of rods post heat-treatment.
• Welding inspection by ultrasonic and X-ray methods.
• Hydraulic pressure testing at rated pressure to ensure no leakage.
• Salt spray testing for chrome-plated rod corrosion resistance.

Certifications

• ISO 9001:2015 (quality management)
• ISO 14001 (environmental)
• CE certification (EU directives)
• RoHS compliance
• DNV / GL / BV approvals for marine/offshore use

Characteristics / technical specifications

• Product name: Three-Stage Telescopic Cylinder
• Bore range: 50 mm – 400 mm
• Maximum stroke: Up to 7000 mm
• Number of stages: Three (custom design available)
• Working pressure: Up to 300 bar
• Materials: ST52 / CK45 / 42CrMo4
• Rod surface: Hard chrome plated, induction hardened
• Seal brands: Parker / Hallite / NOK (optional)
• Temperature range: -30°C to +120°C
• Mounting options: Trunnion, Clevis, Flange, Eye, Lug
• Standard: ISO 6022 / DIN or customized