GB/T 11357-2008 Specifies the key characteristics of pulleys. In terms of materials, according to different application scenarios and performance requirements, the type of suitable materials is clarified to ensure the strength and durability of pulleys. For surface roughness, the parameter range is specified in detail to ensure good contact between pulleys and transmission belts and improve transmission efficiency. In terms of equilibrate requirements, strict standards are formulated to reduce vibration and noise during operation and enhance transmission Stability. This standard provides a clear basis for pulley production and mass inspection, and helps various mechanical transmission systems run smoothly and efficiently.