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Our Telescopic Hydraulic Cylinders are multi-stage, heavy-duty cylinders designed for dump trucks, trailers, and industrial lifting equipment.
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)
|
OD (mm) |
WT (mm) |
Stage Type / Notes |
|
60 |
4 |
Smallest stages, lightweight cylinders |
|
100 |
5 |
Lightweight cylinders |
|
120 |
6 |
Medium-duty cylinders |
|
140 |
7 |
Primary stages for dump trucks |
|
160 |
8 |
Heavy-duty stages |
|
180 |
9 |
Extreme-duty cylinders |
|
200 |
10 |
Extra-heavy duty |
|
220 |
11 |
Very large hydraulic cylinders |
|
250 |
12 |
Specialty / extreme-duty cylinders |
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
Suao is a professional manufacturer of high-precision cold drawn steel tubes, hydraulic tubes, and mechanical structure tubes, integrating R&D, production, inspection, and global sales. We operate two major production facilities covering over 36,000 square meters, with more than 200 employees and an annual output of 50,000+ tons, supplying customers across major industrial markets worldwide. As Suppliers of Telescopic Hydraulic Cylinder – Multi-Stage Cylinder Tube Set, Cold Drawn Steel pipe, E355, our integrated manufacturing capabilities include cold drawing, heat treatment, straightening, finishing, cutting, chamfering, and surface treatment. These are supported by a full range of advanced equipment for non-destructive testing, chemical analysis, and online dimensional monitoring—ensuring every tube meets stringent quality standards. We invest continuously in automation and smart manufacturing systems to enable flexible, high-mix, low-volume production. Custom Telescopic Hydraulic Cylinder – Multi-Stage Cylinder Tube Set, Cold Drawn Steel pipe, E355. Our products are widely used in construction machinery, hydraulic systems, automotive parts, wind energy, shipbuilding, railways, and oil & gas sectors. Certified to ISO 9001, ISO 14001, CE, and RoHS standards, Hongli is more than a manufacturer—we are a trusted long-term partner for global industrial clients.
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