Wrenches are a kind of railway accessories. Usually made of carbon structural steel or alloy structural steel, using lever principle to twist bolts, screws, nuts, and other thread-holding bolts or nut openings or sleeve hole hand tools. The wrench usually has an external force applied to the shank of one or both ends of the shank to exert an external force on the shank, so that the bolt or nut can hold the opening or sleeve hole of the bolt or nut. When the external force is applied to the shank in the direction of thread rotation, the bolt or nut can be turned. The torque wrench is divided into a hearing wrench, a pointer wrench and a digital wrench. Select the appropriate wrench according to the characteristics of the fastened fasteners. Tighten, hold the end of the handle with your hand, and tighten it clockwise; unscrew and rotate counterclockwise.
Common wrenches mainly have the following types:
1. Wrench: One or both ends have a fixed size opening to twist a certain size nut or bolt.
2. Torx wrenches: Work ends with hexagonal holes or dowel holes on both ends are suitable for occasions where the work space is small and ordinary wrenches cannot be used.
3. Dual-purpose wrench: One end is the same as a single head wrench, the other end is the same as a box wrench, and the same size bolt or nut is screwed at both ends.
4. Wrench: The width of the opening can be adjusted within a certain range of sizes, and different bolts or nuts can be screwed.
5. Hook wrench: Also known as a 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 dowel holes and is equipped with handles, posts and other accessories. It is especially suitable for bolts or nuts that are screwed in very narrow or deep recesses. .
7. Allen wrench: L-shaped hexagonal bar wrench, designed to twist the socket head screw. The type of Allen wrench is based on the size of the side of the hexagon. The size of the bolt has national standards. ** Use to tighten or disassemble round nuts on machine tools, vehicles, and machinery.
8. Torque wrench: It shows the applied torque when the bolt or nut is twisted, or it emits a light or sound signal when the applied torque reaches the specified value. Torque wrenches are suitable for assembly work that explicitly specifies the size of the torque.
9. The adjustable wrench: The structural feature of the wrench is that the fixed jaw is made into a flat jaw with a fine tooth; one end of the movable jaw is made into a flat jaw; the other end is made into a concave jaw with a fine tooth; Worm, movable jaw can be quickly removed, change the jaw position.
Common wrenches mainly have the following types:
1. Wrench: One or both ends have a fixed size opening to twist a certain size nut or bolt.
2. Torx wrenches: Work ends with hexagonal holes or dowel holes on both ends are suitable for occasions where the work space is small and ordinary wrenches cannot be used.
3. Dual-purpose wrench: One end is the same as a single head wrench, the other end is the same as a box wrench, and the same size bolt or nut is screwed at both ends.
4. Wrench: The width of the opening can be adjusted within a certain range of sizes, and different bolts or nuts can be screwed.
5. Hook wrench: Also known as a 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 dowel holes and is equipped with handles, posts and other accessories. It is especially suitable for bolts or nuts that are screwed in very narrow or deep recesses. .
7. Allen wrench: L-shaped hexagonal bar wrench, designed to twist the socket head screw. The type of Allen wrench is based on the size of the side of the hexagon. The size of the bolt has national standards. ** Use to tighten or disassemble round nuts on machine tools, vehicles, and machinery.
8. Torque wrench: It shows the applied torque when the bolt or nut is twisted, or it emits a light or sound signal when the applied torque reaches the specified value. Torque wrenches are suitable for assembly work that explicitly specifies the size of the torque.
9. The adjustable wrench: The structural feature of the wrench is that the fixed jaw is made into a flat jaw with a fine tooth; one end of the movable jaw is made into a flat jaw; the other end is made into a concave jaw with a fine tooth; Worm, movable jaw can be quickly removed, change the jaw position.
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