Impact screwdriver or hand wrench for loosening rusty screws

It happens that you need to unscrew a rusty screw, but a Phillips or flathead screwdriver cannot cope and there is a risk of spoiling the edges in the screw head and then there will be an option - to drill and cut a new thread.

But there is another option. If the screw is for a Phillips screwdriver, then a shallow hole is drilled in its center and unscrewed with extractors:

They have a reverse thread, they cut into the screw and it is possible to unscrew it without drilling. But what if the screw has a flat head and is rusted like this:

The WD-40 tool is not going to help much. thread inside. Yes, you can try to unscrew it with the extractor again. But it is better to unscrew this rusted screw immediately with a special device called an impact-rotary screwdriver:

The principle of operation is simple: the axial impact of the screwdriver converts into rotational, radial:

A hammer blow can be compared to an impulse, with a sharp mechanical impact of short amplitude. And the screwdriver will transfer this effort into the rotation of the bit. Thus, you will not tear off the edges of the screw and by tapping you can freely unscrew even rusted fasteners.

To better understand how a screwdriver converts axial impacts into rotational ones, just look at a few photos of homemade such a screwdriver:

The design is shown below in the video:

The assortment of this tool is large, so is the price run. The cost of impact screwdrivers:

I do not advise buying impact screwdrivers at a cost below 1000-1500 rubles. According to reviews, their design is unreliable. The body itself must be massive.

A separate problem with inexpensive models is the bits. It is clear that they will not be reliable. Ideally, it is best to separately purchase cordless impact wrenches from the Impact range of impact wrenches. A large assortment of impact screwdrivers can be viewed in this online store

When buying in Chinese online stores, this model can be distinguished:

The body material is chrome vanadium steel (from which the keys are made). Length: 16.3 cm. Plastic case. Six bits included. The screwdriver comes with a bit adapter. A head for loosening bolts and nuts is installed without an adapter. Alternative link to aliexpress. As I understood, this is a replica from a model of one brand:

Rusty nuts can also be removed with this screwdriver. Also tighten screws, screws and nuts with force. Of course, an impact screwdriver does not replace a cordless impulse screwdriver (impact wrench). But difficult cases with rusty screws do not come across often. And such a screwdriver in your tool kit will always help out.

Who uses such a tool - write what models you have and what difficult cases you managed to unscrew with this screwdriver.

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