Classification and use of wrenches

There are basically two kinds of wrenches, dead wrenches and monkey wrenches. The former refers to the spanner with fixed number, and the latter is the adjustable spanner. 1. Solid wrench: one end or both ends are provided with openings of fixed size for screwing nuts or bolts of certain size. 2. Box spanner: the two ends have working ends with hexagonal holes or twelve corner holes, which is suitable for situations where the working space is narrow and ordinary spanners cannot be used. 3. Dual purpose wrench: one end is the same as the single solid wrench, the other end is the same as the box wrench, and both ends turn the bolts or nuts of the same specification. 4. Monkey wrench: the opening width can be adjusted within a certain size range, and bolts or nuts of different specifications can be rotated. The wrench is characterized in that the fixed jaw is made of a flat jaw with fine teeth; One end of the movable jaw is made into a flat jaw; The other end is made of a concave jaw with fine teeth; Press the worm downward, and the movable jaw can be quickly removed to change the jaw position. 5. Hook spanner: also known as crescent spanner, used to turn flat nuts with limited thickness. 6. Socket wrench: It is composed of multiple sockets with hexagon or twelve corner holes, and is equipped with handles, extension rods and other accessories. It is especially suitable for screwing bolts or nuts with very narrow or deep recesses. 7. Hexagon socket wrench: L-shaped hexagon bar wrench, specially used for turning hexagon socket screws. The model of the hexagonal wrench is based on the size of the opposite side of the hexagon, and the size of the bolt has national standards. Purpose: It is specially used for fastening or disassembling round nuts on machine tools, vehicles and mechanical equipment. 8. Torque wrench: it can display the applied torque when screwing the bolt or nut; Or when the applied torque reaches the specified value, it will send out light or sound signals. The torque wrench is applicable to the installation with clearly specified torque.