Hydraulic wrench is the abbreviation of hydraulic torque wrench. It is powered by hydraulic pressure to provide large torque output,

A professional bolt tightening tool for bolt installation and disassembly, which is often used to tighten and loosen bolts greater than one inch.

The hydraulic wrench is composed of working head, hydraulic pump and high-pressure oil pipe.

Through the high-pressure oil pipe, the hydraulic pump transmits power to the working head to drive the tightening or loosening of the rotating nut of the working head. The hydraulic pump can be driven by electricity or compressed air.

The working head of hydraulic wrench is mainly composed of three parts: frame (also known as shell), oil cylinder and transmission parts. The output force of the oil cylinder, the piston rod of the oil cylinder and the transmission part form a motion pair. The distance from the center of the oil cylinder to the center of the transmission part is the amplified force arm of the hydraulic wrench. The output of the oil cylinder multiplied by the force arm is the theoretical output torque of the hydraulic wrench. Due to the existence of friction resistance, the actual output torque of the hydraulic wrench is less than the theoretical output torque.