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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.
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.
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
QUICK VIEW
Cold-Rolled Steel Tube – EN 10305-3 E235, Ø25 x 1.5mm, Precision Tube for Mechanical Fabrication
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Hydraulic Shock Absorber Tube – EN 10305-2 E235+N, Cold Drawn Welded Precision Steel Tube Ø40 x 2mm
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EN 10305-2 Precision Welded Drive Shaft Tubing – E355, E235, E420, E275 (Ø60 x 3.5 mm & 50–219 mm)
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 Shock Absorber Cylinder Tube – Cold Rolled Steel, Ø50 x 1.5 mm, Polished Inner Diameter (E220, E215, E235, SAE 1010/1020, 25CrMo4), 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 Shock Absorber Cylinder Tube – Cold Rolled Steel, Ø50 x 1.5 mm, Polished Inner Diameter (E220, E215, E235, SAE 1010/1020, 25CrMo4). 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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