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Our Hydraulic Shock Absorber Tube is manufactured to EN 10305-2 standards using
Our Hydraulic Shock Absorber Tube is manufactured to EN 10305-2 standards using
Designed for automotive shock absorbers, struts, and hydraulic suspension systems, these tubes offer:
·High dimensional accuracy
·Excellent surface finish (inner & outer)
·Tight straightness tolerances
·Superior fatigue resistance under cyclic loads
The result is a durable, precision steel tube that ensures long service life in demanding automotive and hydraulic applications.
Key Features
·Standard: EN 10305-2 (Cold Drawn Welded Precision Steel Tubes)
·Material: E235+N (normalized for consistent mechanical properties)
·Manufacturing Process: Cold drawn + welded for precision and smooth surface
·Excellent straightness for easy machining & assembly
·High surface quality (inner & outer bore finish suitable for chrome plating if required)
·Suitable for welding, bending, and machining
Technical Specifications
|
Parameter |
Specification |
|
Standard |
EN 10305-2 |
|
Steel Grade |
E235+N (optional: E355, ST52.3) |
|
OD Example |
Ø40 mm (range: Ø20–Ø100 mm) |
|
Wall Thickness (WT) |
2 mm (range: 1–5 mm) |
|
Manufacturing Process |
Cold drawn welded (CDW), normalized |
|
Surface Finish |
Smooth, free from defects, suitable for plating |
|
Tolerances |
As per EN 10305-2 |
|
Applications |
Automotive shock absorbers, struts, hydraulic dampers |
Common Sizes Available
|
Outside Diameter (OD) |
Wall Thickness (WT) |
Steel Grades Available |
|
Ø20–25 mm |
1.5–2.5 mm |
E235+N, E355 |
|
Ø30–40 mm |
1.5–3 mm |
E235+N, ST52.3 |
|
Ø50–60 mm |
2–4 mm |
E235+N, E355 |
|
Ø70–100 mm |
2.5–5 mm |
E235+N, E355 |
Manufacturing Process
1. Steel Strip Preparation – Slitting and inspection of raw material.
2. High-Frequency Welding – Producing welded tubes with consistent quality.
3. Cold Drawing – To refine dimensions, improve straightness & surface finish.
4. Normalization (N condition) – Heat treatment for uniform mechanical properties.
5. Surface Finishing – Grinding, polishing, or phosphating as required.
6. Inspection – Dimensional check, straightness test, eddy current & surface defect testing.
Advantages of Our Shock Absorber Tubes
·High precision & straightness → easier assembly in shock absorber production
·Smooth inner bore → reduced friction, suitable for piston & sealing systems
·Consistent strength → fatigue resistance in suspension loading
·Custom sizes & lengths available
·Options for plating or coating for corrosion resistance
Applications
·Automotive shock absorbers (cars, trucks, motorcycles)
·Industrial hydraulic dampers
·Suspension struts & actuators
·Vibration isolation systems
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 Hydraulic Shock Absorber Tube – EN 10305-2 E235+N, Cold Drawn Welded Precision Steel Tube Ø40 x 2mm, 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 Hydraulic Shock Absorber Tube – EN 10305-2 E235+N, Cold Drawn Welded Precision Steel Tube Ø40 x 2mm. 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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