Telescopic Hydraulic Cylinder – Multi-Stage Cylinder Tube Set, Cold Drawn Steel pipe, E355

Our Telescopic Hydraulic Cylinders are multi-stage, heavy-duty cylinders designed for dump trucks, trailers, and industrial lifting equipment. 

Each tube set is precision-manufactured from cold-drawn E355 steel, ensuring:

·Smooth extension and retraction across multiple stages
·High strength under heavy loads
·Long service life with minimal maintenance

Custom-built to your specifications, including stage length, diameter, and wall thickness.

 Typical Steel Grades

·EN 10305-1 E355 – cold-drawn seamless steel, high strength and fatigue resistance
·ASTM A519 / ST52 / 20MnV6 / 27SiMn – optional for specialized applications requiring extra strength

Optional Materials

For lightweight or specialty stages, tubes can also be manufactured from:

·EN 10305-2 Cold-Drawn Welded Steel – suitable for lower-pressure or smaller telescopic stages
·ASTM A513 Welded Tubes – precision welded, can be honed or machined for custom applications
·Custom specifications are available on request.

Common Sizes for Telescopic Cylinder Tubes (OD × WT)

Note: Wall thickness increases proportionally with OD to maintain structural integrity, straightness, and smooth piston operation. Custom sizes are available.

Technical Specifications

·Material: Cold-drawn seamless steel E355 (main); optional EN 10305-2 or ASTM A513
·Surface Finish: Machined OD and ID; optional honing for smooth piston travel
·Tolerance: H8 or tighter on ID
·Straightness: ≤ 0.3 mm/m per stage
·Roundness: ≤ 0.03 mm per stage
·Application: Multi-stage telescopic cylinders for dump trucks, trailers, and industrial lifting

 Manufacturing Process

1. Steel Tube Selection – high-strength E355 or optional EN 10305-2 / ASTM A513 grades
2. Cold Drawing – improves straightness, dimensional accuracy, and surface finish
3. Precision Machining – custom OD, ID, and end finishes per stage
4. Optional Honing – ensures smooth piston operation and low friction
5. Inspection – straightness, roundness, dimensional accuracy, and surface finish
6. Assembly Ready – tube sets matched per multi-stage cylinder design

 Key Features & Benefits

·Multi-stage tube sets for telescopic cylinders
·High-strength cold-drawn steel – durable under heavy loads
·Optional materials for lightweight or specialty stages
·Custom-built to fit dump trucks, trailers, or heavy machinery
·Optional honing for smooth piston travel
·Ready-to-assemble sets reduce assembly time

 Applications

·Telescopic cylinders for dump trucks and trailers
·Industrial lifting and material handling equipment
·Heavy-duty mobile machinery
·Custom multi-stage hydraulic cylinders requiring precision tube sets