Taper bore timing pulleys are composed of pulley body, taper sleeve and locking screws, adopting a tapered expansion self-locking structure and transmitting torque through taper surface friction and keyways. They feature high concentricity up to 0.02–0.05 mm, stable operation, zero slip, fixed speed ratio and low noise. Easy to install and disassemble without hammering or heating, pulleys of the same specification can be matched with different taper sleeves to fit various shaft diameters with strong versatility. With a sturdy structure, excellent impact resistance, no slippage and no damage to the shaft, the pulleys are commonly made of aluminum alloy or carbon steel, widely used in precision transmission fields such as automation, packaging and assembly lines, and OEM customization is available.