Corded Electric Impact Wrenches
Although they have been replacing them with their wireless peers, many manufacturers offer corded electric impact wrenches. They provide similar performance to pneumatic impact wrenches similar in size, but only available in very limited sizes.
The body of a corded electric impact wrench is slightly larger than a pneumatic impact wrench comparable. This is necessary for the electric motor, which must be larger than a corresponding air motor of the same force. However, except in tight work areas, they are roughly equivalent in comfort.
The great advantage of corded impact wrenches about pneumatics is that you don’t need a compressor. They can be used anywhere electrical power is available. However, this detail has its drawbacks, since unlike all the others impact wrenches, there may be a risk of electrocution, it is not possible to work in humid places and the cable can be an impediment to the access of the tool to places distant from the electrical outlet.
Cordless Electric Impact Wrenches
These wrenches have become very popular because they not only allow the incorporation of accessories to extract large bolts, but also small ones and are perfect for use in confined spaces, for example, in car engines, since they do not have cables or require the connection of hoses, such as in the two previous cases.
They feed by lithium ion batteries (Li-ion), ranging from 18 to 28 V, depending on the manufacturer and model. There are also models that use batteries of nickel-cadmium (Ni-Cd). Each type of battery has different properties: Li-ion batteries offer much more power, which allows the tool to be used longer between recharges and also recharges much faster. Ni-Cd batteries allow higher current consumption.
Regardless of the type of battery, the cordless impact wrenches they are, however, less powerful than corded or pneumatic ones, and the vast majority offer only half the power of the latter. In addition, infrequent use of the tool depletes the useful life of the battery, so it is preferable not to store them for long periods of time.
However, their portability makes them unique. Of all kinds of impact wrenches Available cordless ones are the best option to use in removing very tight or rusted screws without breaking them. Lower torque, coupled with greater trigger control, makes it possible to use these impact wrenches in the most delicate applications.
Impact wrench or drill / driver?
When it comes to choosing the most suitable tool to remove / place screws or bolts, many have asked this same question at some time. As we have seen, the answer lies not only in the power we need, but also in the dimensions and / or the type of bolt or bolt.
In the following example we will see a demonstration that can clarify many of these doubts.