What are the dimensional tolerance standards for cold-rolled coils?

2025-09-15 10:03:36

 The dimensional tolerance standards for cold-rolled coils vary according to different national and regional specifications, with common examples including the Chinese national standard GB/T 708, the Japanese standard JIS G3141, and the American standard ASTM A653. Taking the Chinese national standard as an example, thickness tolerances typically range from ±0.02mm to ±0.05mm (varying according to thickness), while width tolerances generally fall between ±1mm and ±3mm. Flatness requirements typically stipulate that wave height per metre must not exceed a specified value (e.g., 2mm/m). Permissible defect levels for different surface quality grades are also clearly defined. In actual production, enterprises often establish internal control standards stricter than national standards to meet customer requirements. When purchasing, the applicable product standard and tolerance requirements should be clearly specified.