Types and specifications of wrenches: One or both ends have openings of fixed size for turning nuts or bolts of a certain size.
Function: General tool, which is an essential hand tool for assembling machine tools or spare parts and maintaining transportation and agricultural machinery.
Dimensions: 4×5, 5.5×7, 8× 10, 9× 1 1, 12× 14, 13x 15.
Usage: It can be nested up and down or inserted directly when used. Details >>
Features of the ring wrench: both ends have working ends with hexagonal holes or dodecagonal holes, which are suitable for situations where the working space is narrow and ordinary wrenches cannot be used.
Function: Torx end is usually used for initial screwing and final locking of screws (caps).
Size: 8* 10,10 */2, 12* 14, 14* 17,16.
Usage: Push the joint between the wrench and the bolt with the left hand, keep the ring wrench completely consistent with the bolt, and hold the other end of the wrench with the right hand. Details >>
Features of dual-purpose wrench: one end is the same as that of single-headed wrench, the other end is the same as that of ring wrench, and bolts or nuts with the same specifications are screwed into both ends.
Functions: Equipment installation, equipment maintenance, large-scale industrial petroleum, chemical industry, metallurgy, power generation, oil refining and other industries.
Dimensions: 4 inches, 6 inches, 8 inches, 10 inch, 12 inch, 15 inch, 18 inch, 24 inch, etc.
Usage: When using, adjust the wrench to be slightly larger than the nut, hold the handle with your right hand, then turn the worm wheel with your right hand and press the wrench tightly on the nut.
Features of adjustable wrench: The opening width of adjustable wrench can be adjusted within a certain range, and it is a tool for fastening and loosening nuts and bolts of different specifications.
Function: used for rotating hexagon or square head bolts, screws and nuts.
Dimensions: 4 ",6", 8 ",10", corresponding to openings 1.3, 1.93, 2.4 and 3 cm.
Usage: the wrench is not easy to open. After opening, apply tension to the thicker side to prevent the opening from appearing splayed. Details >>
Hook wrench features: also known as crescent wrench, used to screw flat nuts with limited thickness.
Function: used for screwing flat nuts with limited thickness; It is specially used for disassembling and assembling round nuts on vehicles and mechanical equipment.
Dimensions: 22-26, 28-32, 34-36, 45-52, etc.
Usage: Adjust the required torque value on the wrench, lock the bolt with the wrench, and loosen the bolt immediately when the torque value reaches and clicks.
Features of socket wrench: It is composed of multiple sockets with hexagonal holes or dodecagonal holes, and is equipped with handles, connecting rods and other accessories.
Function: Suitable for turning bolts or nuts with narrow position or deep depression.
Size: large, medium and small, the common ones are 6.3mm series, 10mm series and 12.5mm series.
Usage: put the sleeve on the square tenon of the matching handle, and hold the joint between the handle and the sleeve tightly with your left hand, so as not to shake it, so as to avoid the sleeve slipping out or damaging the edges and corners of the bolt and nut. When in use, give the screwdriver sleeve enough downward pressure. Can be connected to the connecting rod to extend the service time and increase the torque. Details >>
Features of Allen wrench: L-shaped hexagon wrench, specially used for turning Allen screws.
Function: It is specially used for fastening or disassembling round nuts on machine tools, vehicles and mechanical equipment.
Size: height10mm ~ 70mm; The length is 32 mm ~175 mm; Hexagon opposite 0.7 mm ~19 mm.
Usage: Put the hexagon wrench into the hexagon groove of the screw. Tighten the screws clockwise. Loosen the screw counterclockwise. Details >>
Features of torque wrench: Also known as torque wrench, torque wrench and torque adjustable wrench, the torque can be set and adjusted.
Function: Fixed torque wrench must be used for initial and final screwing of high-strength hexagon bolts.
Dimensions: 1-5N, 5-25N, 10-50N, 20- 100N, 40-200N, 70-350N.
Usage: First, connect the square tenon of the wrench with the auxiliary fittings to ensure the connection. Before strengthening the torque, set the force value to be strengthened, lock the locking device, and adjust the direction change button to the direction of force application. Details >>
The wrench of the pipe wrench is characterized by similar appearance to that of adjustable wrench, but the two claw surfaces have teeth to increase the clamping force. The front claw is a movable claw, and the opening size can be adjusted by adjusting the nut.
Function: used for clamping rotating steel pipes or other circular workpieces.
Size: specification 8 "~ 48"; The total length is 200mm~ 1200mm.
Usage: First, check whether the fixing pin is firm, and the clamping force will be converted into torsion. The greater the force used in the twisting direction, the tighter the pipe can be clamped. Details >>
Electric wrench, hydraulic wrench, pneumatic wrench, explosion-proof wrench
How to Choose a Wrench The principle of choosing a wrench: I understand that the editor of the TV network suggests that you choose a ring wrench and a socket wrench first, followed by an open-ended wrench, and finally choose adjustable wrench.
What is the wrench made of? Wrenches are generally made of carbon steel and alloy steel, and alloy steel is mostly chrome vanadium steel. There are many labels for chrome vanadium steel. Generally speaking, the higher the label, the better the quality. Carbon steel materials are generally used for low-grade products, and chrome vanadium steel is generally used for medium and high-grade products.
Appearance style: There are many styles of dual-purpose wrenches, including convex handle, concave handle and flat handle. Each production process is different, and the surface treatment is also very different. The convex handle is mostly carbon steel, and the concave handle is mostly alloy steel.
Perforated appearance: Plum blossom is full in shape, graceful in curve, uniform in wall thickness and more standardized. The opening part is round, and the outside is too smooth and smooth. The inner wall of the hole is smooth, without burrs and knife marks. Shake hands, round, not flashing.
Surface treatment: There are many kinds of surface treatments, such as polishing, mirror, matte, blackening, electrophoresis and so on. Among them, there are many subtle differences on the surface of frost and fog. Among them, watermark fog is the highest grade. Another important thing is the quality of the above specifications and trademarks. The trademarks and specifications should be clear, and the fonts should be uniform and exquisite.
Thickness: The smaller the wrench of the same specification, the higher the standard requirements such as torque, and the lighter the weight, the more comfortable it is for people to use, so the quality is probably good.
Tolerance range: for example, 14MM nut corresponds to 14MM opening; The opening needs to be enlarged properly, which is beneficial to rapid fitting; But it should not be enlarged too much, which will damage the nut and make it "slippery". So the size of the opening or plum blossom opening needs to be accurate.
Torsion and hardness: excellent quality needs the perfect combination of hardness and toughness, too hard and toughness is not easy to break; Too soft and easy to deform.
Bian Xiao recommended Dongcheng electric wrench, heavy-duty rechargeable brushless lithium battery holder with large torque, electric air cannon and Dongcheng impact wrench. Sales in February 282: 93+ Store Dongcheng electric tool flagship store >> Ehrt fully polished open-ended plum wrench special for automobile maintenance ￥24.2 Sales in February: 36+ Store Ehrt tool flagship store >> Boda rechargeable electric wrench, air gun sleeve and automobile impact wrench PW2-48F￥679. & gt& gt Precautions for the Use of Wrenches ①5 1 Ishiabe Xiao reminded that wrenches with appropriate specifications should be selected for operation according to the shapes, specifications and working conditions of screws and nuts.
② adjustable wrench, which is composed of wrench body, fixed jaw, movable jaw and worm, is a universal wrench. Its opening size can be adjusted within a certain range, so it is generally possible to use screws and nuts within the opening size range. However, it is not allowed to tighten a smaller screw with a big wrench, which will cause the screw to break due to excessive torque; Let the fixed jaw bear the main force, tighten the wrench handle in the direction of the operator, and do not push forward. The handle of the wrench should not be extended at will, and the wrench should not be used as a hammer tool.
③ Ratchet wrenches and torque limiting wrenches are special wrenches manufactured according to special requirements. They should be used correctly according to the requirements of the product manual, or the intensity should be adjusted according to the reading of the indicator.
(4) Pulling wrenches (open wrenches), socket wrenches, locking wrenches and Allen wrenches are called special wrenches. When using a wrench, the opening of the wrench should match the threaded part before applying force. If the contact is not good, the force will easily slip, which will make the operator unbalanced. When using a socket wrench, it is also necessary to contact before applying force. If deformation or cracks are found in the plum blossom sleeve and wrench handle, stop using it, and pay attention to remove dirt and oil stains on the sleeve at any time. When using locking wrenches and Allen wrenches, you should pay attention to choosing appropriate specifications and models to prevent slipping and hurting your hands.
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