Hydraulic torque wrenches apply a set force to tighten nuts and bolts to a target torque so they won't loosen over time or get damaged from overtorquing. They connect to a hydraulic pump and convert fluid pressure into force for turning fasteners. These wrenches are commonly used on equipment in industrial processing, oil and gas, wind energy, mining, and heavy manufacturing plants. Square-drive hydraulic torque wrenches use interchangeable hydraulic wrench sockets to turn fasteners. Low-profile hydraulic torque wrenches use cassettes that give the wrenches a slim profile to slip over nuts and bolts in narrow or recessed spaces. Tubes, spanners, and manifolds work with compatible hydraulic torque wrenches to enhance their function or ease their use.