1. Basic Definition
Metric size standard: refers to aluminum rods manufactured according to international metric units (mm, m), with a diameter tolerance of ±0.1mm and a length tolerance of ≤±2mm/m;
Material properties: covers mainstream aluminum alloy models such as 6061, 6063, and 7075, with a hardness range from T6 (artificial aging) to T651 (stretching straightening) states.
2. Key Specifications
Parameter Type Typical Indicators Applicable Standards
Diameter Tolerance Φ20mm±0.15mm ASTM B221/EN 754
Straightness Tolerance ≤0.3mm/m GB/T 3191
Surface Roughness Ra≤3.2μm (Polished) ISO 4287
3. Main Application Scenarios
Architectural Structure Support
Formwork support aluminum beam (model 6063-T5) is used for floor construction, with bending strength ≥200MPa and a span of up to 4.5 meters;
Photovoltaic bracket uses 6061-T6 aluminum rod, and its weather resistance meets the requirements for 20 years of outdoor use.
Electromechanical equipment manufacturing
Round aluminum rods (Φ8-25mm) for motor windings have a conductivity of ≥61% IACS and a resistivity of ≤28.264 nΩ·m;
High-precision guide rails (7075-T651) have a straightness control of ≤0.05mm/m, suitable for CNC machine tools.
IV. Technical requirements and certification
Chemical composition: Fe≤0.35%, Si≤0.4% (6061 alloy), ensuring welding performance 38;
Mechanical properties: Tensile strength ≥310MPa (6063-T5), ≥570MPa (7075-T6);
Certification standards: Must comply with RoHS 3.0 environmental protection directives and CE safety certification.
Key points of industry practice
Diameter tolerance grades (such as H9, H11) should be clearly specified during purchase to avoid excessive assembly clearances;
Aluminum bars for power use must pass the IEC 60228 conductivity test, and 1350-O aluminum should be selected to optimize current carrying capacity.
