English
Español
русский
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.
Established In
Employees
Export Country
Annual Production
EN 10305-2 cold drawn welded tube is the precision tube behind many hydraulic cylinders, telescopic stages, shock absorbers, drive shafts, and compact mechanical assemblies. If you work in fluid power or machine buildin...
Few steel grades appear on hydraulic cylinder drawings as often as E355. In cylinder shops the callout is almost a reflex: tube to EN 10305-1, grade E355, honed ID. That short line carries a great deal of information ab...
If you buy mechanical or hydraulic tube for a living, you have heard this question more than once: is DOM tubing the same as seamless tubing, and does the difference actually matter? The short answer is that these are t...
Choosing between 20MnV6 and ST52 tube is one of the most frequent conversations we have with hydraulic cylinder builders, machine integrators and equipment OEMs. Both are carbon-manganese steels, both are supplied as co...
