1. Commonly used sizes for dumb hands are 12 inches, 14 inches, 17 inches, and 19 inches. The sizes of the trappers are 8 inches and 10 inches.
2. Common wrench types:
(1) Open spanner: one or both ends are provided with fixed size openings for turning nuts or bolts of a certain size.
(2) Plum blossom wrenches: working ends with hexagonal holes or twelve corner holes are provided at both ends. It is suitable for occasions where the working space is narrow and ordinary wrenches cannot be used.
(3) Dual-purpose wrench: one end is the same as a single-end open wrench, the other end is the same as a torx wrench, and the same specifications of bolts or nuts are turned at both ends.
(4) Adjustable spanner: the width of the opening can be adjusted within a certain size, and it can turn different sizes of bolts or nuts.
(5) Hook wrench: also known as crescent wrench, used to twist flat nuts with limited thickness.
(6) Socket wrench: It is composed of a plurality of sockets with hexagonal holes or twelve corner holes and equipped with handles, connecting rods and other accessories. It is especially suitable for screwing positions that are very narrow or deep in depressions Bolt or nut.
(7) Hexagon wrench: It is an L-shaped hexagonal rod wrench, which is used for turning hexagonal screws.
(8) Torque wrench: It can display the applied torque when turning the bolt or nut; or when the applied torque reaches the specified value, it will emit a light or sound signal. Torque wrenches are suitable for assembly work where the torque is clearly specified.
3. The commonly used wrench sizes in life are 12 inches, 14 inches, 17 inches, and 19 inches.
Common types:
1. Open wrench: fixed size openings are made at one or both ends to turn nuts or bolts of a certain size.
2. Torx wrench: Both ends have working ends with hexagonal holes or twelve corner holes, suitable for occasions where the working space is narrow and ordinary wrenches cannot be used.
3. Dual-purpose wrench: one end is the same as a single-end open wrench, the other end is the same as a torx wrench, and the same specification bolts or nuts are turned at both ends.
4. Adjustable wrench: The width of the opening can be adjusted within a certain size range, and it can turn different sizes of bolts or nuts. The structural feature of the wrench is that the fixed jaws are made into flat jaws with fine teeth; one end of the movable jaws is made into flat jaws; the other end is made into concave jaws with fine teeth; press the worm downward to move The jaws can be quickly removed and the position of the jaws can be changed.
5. Hook wrench: also known as crescent wrench, used to twist flat nuts with limited thickness.
6. Socket wrench: It is generally called a socket: it is composed of multiple sockets with hexagonal holes or twelve-angle holes and is equipped with a variety of accessories such as handles and connecting rods. It is particularly suitable for very narrow screwing positions or depressions. Bolts or nuts deep.
7. Hexagonal wrench: It is an L-shaped hexagonal rod wrench, which is specially used for turning hexagonal screws. The model of the hexagon socket wrench is based on the hexagonal side dimensions, and the bolt size has national standards. Specially used to tighten or remove round nuts on machine tools, vehicles, and mechanical equipment.
8. Torque wrench: It can display the applied torque when turning the bolt or nut; or when the applied torque reaches the specified value, it will emit a light or sound signal. Torque wrenches are suitable for assembly where the torque is clearly specified.
