The DIN ISO 21951-2001 standard specifies the dimensions and requirements for flat disc coated abrasives with holes for dust extraction. These abrasive discs are suitable for disc sanding machines with dust collection functions and are designed to improve the cleanliness and efficiency of sanding operations. The standard covers the manufacturing materials, treatment methods, performance indicators and safety and environmental standards of abrasive discs, ensuring the performance and safety of abrasive discs during use.