Hydraulic Shock Absorber Tube – EN 10305-2 E235+N, Cold Drawn Welded Precision Steel Tube Ø40 x 2mm-Jiangsu Suao Metal Product Co., Ltd.

Hydraulic Shock Absorber Tube – EN 10305-2 E235+N, Cold Drawn Welded Precision Steel Tube Ø40 x 2mm

Our Hydraulic Shock Absorber Tube is manufactured to EN 10305-2 standards using

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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