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How to Choose an Air Impact Wrench

Aug 08, 2022


What is an Air Impact Wrench


An air wrench also called pneumatic wrench, is a tool that provides high torque output with minimal compressed air consumption. It accelerates the rotation of an object with a certain mass through a continuous power source, and then hits the output shaft instantly, so that a relatively large torque output can be obtained. Air wrenches are widely used in many industries, such as auto repair, heavy equipment maintenance, product assembly, major construction projects, and anywhere else where high torque output is required. General air impact wrenches are not suitable for the fastening of soft-connected installations with ceramic or plastic bodies.


Air Impact Wrench



How to Choose an Air Impact Wrench


The first thing to do is to make sure that the air impact wrench you choose has the correct torque required to complete your job. There are different torque requirements for removing various sizes of screws. In the table below, you will easily find the most suitable size to remove each bolt size category, try to choose an air impact wrench with the corresponding parameters.


We can generally choose the appropriate air impact wrench according to different applications.

1. 1/2 inch air impact wrench means the side length of the square drive head part of the connecting sleeve is 1/2 inch (ie 12.7mm). This is a relatively small air gun, suitable for removing screws on car tires.


2. 3/4 inch air impact wrench, high torsional strength, moderate weight, made of high-nickel alloy steel, strong design, professionally used in the automotive maintenance industry, shipbuilding, metallurgy mining, oil field, railway and heavy machinery bolt unloading.


3. 1-inch air impact wrench, equipped with 1-inch square drive head, with greater torque. Generally it is suitable for screw removal on relatively large cars, trucks and buses.



Operation and Maintenance Tips for Air Impact Wrench


1. A correct air supply system is required. In this way, the product can be used longer and better. Be sure to ensure the compressed air entering the air motor of the wrench: safe, clean and dry air with a maximum pressure of 6.0bar. Otherwise, dangerous situations such as driveline failure, overspeed, rupture, wrong output torque, etc may happen.


2. Before operating the machine, be sure to check whether there is enough lubricating oil in the oil cup. In the case of lack or lack of lubrication, the wear rate of the air motor blades will be accelerated, it will reduce the tool performance and more maintenance work would occur.


3. In order to ensure the torque output, the air impact wrench has the required diameter and size for connecting the air pipe. The minimum size of the general 1/2 air impact wrench is 3/8in/10mm, so as to ensure that all hoses and other connecting devices are of correct size and installed firmly. ;Do not use damaged, worn or aged air hoses and other connections; it is recommended to install an emergency shut-off valve on the air supply line and let others know where it is installed.


4. Pay attention to the position of the reversing switch before operation, so as to know the direction of rotation during operation. The power adjustment knob is adjusted to the appropriate position, 1 is the minimum, the larger the number, the greater the maximum output torque, the output power of forward or reverse rotation can be further adjusted. The power level indication of conventional air impact wrench is for reference only, and does not indicate specific power. Pneumatic torque wrench is a hand-held rotary pneumatic tool that can precisely set the torque to complete the locking or dismantling of nuts and bolts; the control part is realized by a voltage regulator and a power management system, the mechanical part adopts a planetary gear reduction mechanism.


5. Pay attention during use, the body posture must be kept balanced and stable, do not operate the tool too much. When turning on and operating the tool, prevent and be alert to sudden changes in torque and force in motion. In the event of a hose failure or a broken connection, install a properly sized air safety device upstream of the hose and use a stabilizer through any hose connection to prevent the hose from wobbling without shutting off the inside of the hose.


6. This tool is a torque tool with a reaction arm. The huge torque generated by the machine is absorbed by the reaction arm. Therefore, it is necessary to find a support point with sufficient strength for the reaction arm during operation. In view of safety considerations, when the machine is working, be sure to stay away from the working range of the reaction arm, otherwise, it may cause huge personal injury.


7. Do not arbitrarily remove the parts in the tool and then operate. Not only affects safety but may damage the tool. If the tool is faulty, cannot achieve the original function, can no longer be used, it should be checked and repaired by the manufacturer or professional personnel immediately.


8. Regularly check, maintain tools, and add pneumatic lubricating oil!

In order to make the tool have a longer use time, we need regular inspection, regular maintenance, and increase the pneumatic lubricating oil.



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