What is a cross wrench? Use the principle of leverage t […]
What is a cross wrench? Use the principle of leverage to turn bolts, screws, nuts, and other threaded hand tools that hold the openings of bolts or nuts or sets of holes. Wrenches are usually made with clamps on one or both ends of the handle to apply external force to the handle to apply external force to turn the bolt or nut to hold the opening or sleeve of the bolt or nut. When in use, an external force is applied to the shank along the direction of thread rotation, and the bolt or nut can be turned.
Several commonly used wrench types:
1. Stay wrench. A fixed size opening is made at one or both ends for screwing nuts or bolts of a certain size.
2. Torx wrench. Both ends have working ends with hexagonal holes or twelve-angle holes, which are 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-head open wrench, and the other end is the same as a torx wrench. Both ends are screwed with bolts or nuts of the same specification.
4. Adjustable wrench. The width of the opening can be adjusted within a certain size range, and bolts or nuts of different specifications can be turned.
5. Socket wrench. It is composed of multiple sockets with hexagonal holes or twelve-angle holes and equipped with handles, extension rods and other accessories. It is especially suitable for screwing bolts or nuts with very narrow positions or deep recesses.
6. Allen wrench. L-shaped hexagonal rod-shaped wrench, specially used to turn 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.
7. 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 with clearly defined torque.
Matters needing attention in safe operation of wrenches:
1. The adjustable wrench is a universal wrench consisting of a wrench body, a fixed jaw, a movable jaw and a worm. Its opening size can be adjusted within a certain range, so screws and nuts within the opening size range can generally be used. However, large-size wrenches should not be used to tighten small-size screws, which will cause the screws to break due to excessive torque; the opening should be adjusted according to the size of the opposite side of the hexagonal head of the screw or the hexagon of the nut, and the gap should not be too large, otherwise it will It will damage the screw head or nut, and easily slip off, causing injury; the fixed jaw should be subject to the main force, and the wrench handle should be tightened in the direction of the operator. Do not push forward. The wrench handle cannot be extended arbitrarily. The wrench should be used as a hammering tool.
2. Open-ended wrenches (open-end wrenches), socket wrenches, lock wrenches and hexagon wrenches are called special wrenches. Its characteristic is that the single head can only screw one size of screw head or nut, and the double head can only screw two sizes of screw head or nut; when using the open wrench, the wrench opening and the screwed part should be used. Use force after the fit. If the contact is not good, it will slip off easily, causing the operator to lose balance; the socket wrench needs to be contacted and then used force when it is found to be deformed or cracked in the plum blossom socket and wrench handle. Stop using, and pay attention to removing the dirt and oil in the sleeve at any time; when using the lock wrench and the Allen wrench, pay attention to selecting the appropriate specifications and models to prevent slippage and hurt your hands.