Shock Absorber Cylinder Tube – Cold Rolled Steel, Ø50 x 1.5 mm, Polished Inner Diameter (E220, E215, E235, SAE 1010/1020, 25CrMo4)-Jiangsu Suao Metal Product Co., Ltd.

Shock Absorber Cylinder Tube – Cold Rolled Steel, Ø50 x 1.5 mm, Polished Inner Diameter (E220, E215, E235, SAE 1010/1020, 25CrMo4)

Our Shock Absorber Cylinder Tubes are manufactured from cold rolled precision steel with a polished inner diameter (ID) to ensure smooth piston travel, reduced friction, and superior sealing.

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Available in a range of steel grades, from cost-effective low-carbon steels to high-strength alloy options, these tubes are designed to meet the requirements of passenger cars, motorcycles, trucks, and high-performance racing suspensions.

Key Features

Standards: EN 10305-2, EN 10130, ASTM A513
Steel Grades Available:
·E220 – standard, excellent formability & weldability
·E215 / E235 – higher strength precision welded tubes
·SAE 1010 / 1020 – widely used in North American market
·25CrMo4 – premium grade for motorsport / heavy-duty shocks
·Thin-wall design for lightweight suspension components
·Polished ID (Ra ≤ 0.4 µm) for smooth piston travel
·High straightness for automated shock absorber assembly
·Custom surface treatments available: chrome plating, phosphating, e-coating

Technical Specifications

Parameter	Specification
Standards	EN 10305-2, EN 10130, ASTM A513
Steel Grades	E220, E215, E235, SAE 1010/1020, 25CrMo4
Outside Diameter (OD)	Ø30–Ø60 mm (example Ø50 mm)
Wall Thickness (WT)	1.0–2.5 mm (example 1.5 mm)
Surface Finish	Polished inner diameter, Ra ≤ 0.4 µm
Tolerances	As per EN 10305-2
Straightness	≤ 0.5 mm per meter
Applications	Automotive & motorcycle shock absorbers, truck dampers, racing suspensions

Common Sizes Available

OD (mm)	Wall Thickness (mm)	Typical Grade	Surface Finish
Ø30	1.0–1.5	E220 / SAE 1010	Polished ID
Ø40	1.0–2.0	E235 / SAE 1020	Polished ID
Ø50	1.5	E220 / 25CrMo4	Polished ID
Ø60	2.0–2.5	E215 / E235	Polished ID

Manufacturing Process

1. Cold Rolling → thin-wall tube with precise tolerances
2. Forming & Welding (if applicable) → EN 10305-2 precision welding
3. Heat Treatment (Normalizing) → ensures stability and consistency
4. ID Polishing → Ra ≤ 0.4 µm for piston smoothness
5. Straightness Control → ≤ 0.5 mm/m for assembly accuracy
6. Testing & Inspection → dimensional, surface roughness, weld integrity

Advantages

·Excellent piston movement due to smooth bore finish
·Choice of steel grades → cost-efficient (E220/1010) or performance (25CrMo4)
·Lightweight design reduces vehicle mass, improves fuel efficiency
·High straightness & tight tolerances → consistent shock absorber performance
·Customizable finishes for corrosion resistance

Applications

·Passenger car shock absorbers
·Motorcycle suspension forks
·Truck dampers & light commercial vehicles
·High-performance racing shock absorbers (25CrMo4)
·Industrial vibration dampers