Square Hollow Copper Tube|EN 13605 Cu-OF (CW008A)
EN 13605 Cu-OF (CW008A) square hollow copper tubes are manufactured from oxygen-free high-conductivity copper to provide excellent electrical conductivity, superior thermal performance, and reliable long-term operation. The hollow square design allows efficient water cooling while maintaining high current carrying capacity, making these copper tubes widely used in transformers, induction heating systems, resistance welding equipment, power distribution components, and water-cooled electrical conductors.
EN 13605 Cu-OF (CW008A) hollow copper tubes
Material: Cu-OF (CW008A) – Oxygen-Free Copper
Standard: EN 13605
Form: Square outside+round hole inside
Purity: ≥ 99.95% Cu
Typical Conductivity: ≥ 101% IACS
Cu-OF (CW008A/C10200/TU1) Hollow Copper Tube Sizes
Parameter | Typical Range |
Outer Size | 8 × 8 mm – 60 × 60 mm |
Inner Hole Diameter | Ø4 mm – Ø30 mm |
Wall Thickness | 1.5 – 10 mm |
Length | Coil or straight length |
Weight Tolerance | 0 / +5% |
Dimensional Tolerance | EN 13605 compliant |
Custom cross-sections and tolerances are available upon request.
Copper Tube Dimension Chart for Exsiting Dies
No. | Size (mm) | OD (mm) | OD Tolerance (mm) | ID (mm) | ID Tolerance (mm) | R Angle (mm) | Tensile Strength (MPa) | Hardness (HB) | Conductivity (% IACS) |
1 | 5 × 5 × Ø3 | 5 | ±0.05 | 3 | ±0.05 | 0.5 | ≥205 | 50–70 | ≥100 |
2 | 6 × 6 × Ø3 | 6 | ±0.05 | 3 | ±0.05 | 0.5 | ≥205 | 50–70 | ≥100 |
3 | 6 × 6 × Ø4.5 | 6 | ±0.05 | 4.5 | ±0.05 | 0.5 | ≥205 | 50–70 | ≥100 |
4 | 7 × 7 × Ø4 | 7 | ±0.05 | 4 | ±0.05 | 0.5 | ≥205 | 50–70 | ≥100 |
5 | 8 × 8 × Ø4 | 8 | ±0.05 | 4 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
6 | 8 × 8 × Ø4.5 | 8 | ±0.05 | 4.5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
7 | 8 × 8 × Ø5 | 8 | ±0.05 | 5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
8 | 8.25 × 8.25 × Ø4.6 | 8.25 | ±0.05 | 4.6 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
9 | 9 × 9 × Ø4.5 | 9 | ±0.05 | 4.5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
10 | 9 × 9 × Ø6 | 9 | ±0.05 | 6 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
11 | 10 × 10 × Ø5 | 10 | ±0.10 | 5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
12 | 10 × 10 × Ø7 | 10 | ±0.10 | 7 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
13 | 10.5 × 10.5 × Ø6 | 10.5 | ±0.10 | 6 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
14 | 10.8 × 10.8 × Ø6.5 | 10.8 | ±0.10 | 6.5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
15 | 11 × 11 × Ø7 | 11 | ±0.10 | 6.5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
16 | 12 × 12 × Ø6 | 12 | ±0.10 | 6 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
17 | 13 × 13 × Ø8.5 | 13 | ±0.10 | 8.5 | ±0.05 | 1 | ≥205 | 50–70 | ≥100 |
18 | 18.5 × 18.5 × Ø10 | 18.5 | ±0.15 | 10 | ±0.10 | 1 | ≥205 | 50–70 | ≥100 |
19 | 22 × 22 × Ø10.5 | 22 | ±0.20 | 10.5 | ±0.10 | 2 | ≥205 | 50–70 | ≥100 |
20 | 25 × 25 × Ø12 | 25 | ±0.20 | 12 | ±0.10 | 2 | ≥205 | 50–70 | ≥100 |
21 | 29 × 29 × Ø16 | 29 | ±0.20 | 16 | ±0.10 | 2 | ≥205 | 50–70 | ≥100 |
22 | 30 × 30 × Ø12 | 30 | ±0.20 | 12 | ±0.10 | 2 | ≥205 | 50–70 | ≥100 |
23 | 45 × 45 × Ø20 | 45 | ±0.20 | 20 | ±0.20 | 3 | ≥205 | 50–70 | ≥100 |
Cu-OF (CW008A/C10200/TU1) Hollow Copper Mechanical & Electrical Properties
Property | Cu-OF (CW008A) |
Electrical Conductivity | ≥ 101% IACS |
Resistivity (20°C) | ≤ 0.0170 μΩ·m |
Tensile Strength | 200 – 250 MPa |
Yield Strength | 70 – 100 MPa |
Elongation | ≥ 30% |
Density | 8.94 g/cm³ |
Oxygen Content | ≤ 0.001% |
Usage of Cu-OF (CW008A/C10200/TU1) Hollow Copper Tube
Electrical & Power Engineering
High-current busbar systems
Switchgear and power distribution units
Substations and transformer connections
Thermal & Cooling Systems
Water-cooled conductors
Induction heating equipment
Resistance welding machines
Industrial & Infrastructure
Electrolysis and electroplating lines
Rail traction and power electronics
Renewable energy systems (wind, solar inverters)
Machining & Assembly Use
Easily machinable for CNC cutting, drilling, and bending
Suitable for brazing, soldering, and pressure-fit joints
Compatible with insulated or coated assemblies
Cu-OF vs Cu-ETP Comparison
Property | Cu-OF (CW008A) | Cu-ETP (CW004A) |
Oxygen Content | ≤ 0.001% | ~0.04% |
Conductivity | ≥ 101% IACS | ≥ 100% IACS |
Hydrogen Embrittlement | None | Possible |
High-Temperature Stability | Excellent | Moderate |
Welding / Brazing | Excellent | Limited |
Recommended Use | High-end electrical & cooling | General electrical |
