What Does a Screwdriver Voltage Affect

When choosing a screwdriver suitable for certain tasks, you should pay attention to various characteristics. Among them, the most important are not only the power of the device and the capacity of its battery, but also the voltage of the battery, and even the value of torque.

During construction and repair work, a screwdriver is an indispensable tool that simplifies the twisting of various types of fasteners, and sometimes even drilling holes. And, despite the fact that there are two versions of this device. network and battery, more often the last option is chosen to perform household tasks. At the same time, attention is drawn to the parameters of the power tool itself and to its characteristics such as the voltage in the screwdriver, its power, torque and battery capacity. Each of these indicators is important for evaluating and choosing the right device. Then how to buy because of only one suitable power or voltage is not worth it.

Key parameters of the battery and the tool itself

The main parameter that characterizes the work of a screwdriver is the battery voltage, on which, in turn, depends on the power of the electric motor and torque. For household models, the difference between the screwdrivers in voltage is small. on average, it is in the range of 10.8–14.4 V. productive options designed for continuous use can be equipped with 24–36 volt batteries.

What Does a Screwdriver Voltage Affect

The voltage of the screwdriver’s battery also depends on the type of battery. you can answer what the difference is, knowing which metals were used to make it. For nickel-cadmium batteries, large in size with a similar capacity, the value of the indicator is a multiple of 1.2 V (this is the voltage for one element that makes up the battery pack), for lithium-ion batteries. 3.6 V.

Among other, no less important characteristics can be noted:

  • power of a screwdriver, by which it is also possible to determine the speed of twisting of screws and self-tapping screws. To carry out repairs on their own, models with a capacity of 500-700 watts are quite enough. A repair technician will need more powerful equipment. at 800–850 W;
  • the number of revolutions of the rotating part of the device per unit time. This parameter determines whether the screwdriver can fulfill the task assigned to it. for example, tighten the desired type of fastener. So, for a bolt, a self-tapping screw and a screw, 500 rpm is enough, for drilling you need already 1200 rpm;
  • torque, the value of which can become one of the main answers to the question of what is affected by the battery voltage of a screwdriver. From this characteristic, you can determine both the diameter and the length of the screw or self-tapping screw. For large fasteners, as well as for drilling deep and wide holes, and for hard materials, a serious torque value is required. The maximum value of the indicator is 10-60 Nm.

There are two types of screwdriver torque. starting (larger in size and required to start the device into operation) and constant, that is, working. The parameter value for modern equipment models can be adjusted. to find out how many modes can be selected for a particular device, you can find in the documentation available on it. over, tools with a pulsed mode of operation (turning on the rotating part in jerks) have more screwing possibilities. allowing them to periodically increase the torque, they can screw a larger screw.

The output torque value for electric motors is not constant and depends primarily on the speed of the motor, the higher the speed, the lower the torque on the shaft.

In addition to the voltage of the screwdriver and its power, the battery capacity should be evaluated. The characteristic is measured in ampere-hours or milliampere-hours. The higher the indicator, the longer the screwdriver can work without recharging.

The average battery capacity of a household model is 1300 mAh, which lasts for 2-3 hours. Professional equipment requires more time to complete the work. and a foreman who uses a screwdriver for a whole working day should buy a model with 1.5–2.0 Ah batteries.

Features of choice

When choosing a power, it is worth taking into account not only what power of the screwdriver is indicated in the information from the manufacturer. Due to too much productivity, the device can tighten the screws too much, pushing their cap into the surface. As a result, the appearance of the coating deteriorates, and the fasteners, if necessary, are almost impossible to unscrew.

When choosing which voltage is best for a screwdriver, it should be borne in mind that voltage is the main parameter of the device. So, for example, the power of the Makita DDF343SHE screwdriver motor is 700 W, with a voltage of 14.4 V and a battery capacity of 1300 mAh and a torque of 36 Nm. While the other Hammer ACD182 model has a weaker engine (22 Nm) and a not so capacious battery (1200 mAh). and it seems that this device is weaker by about 40%. However, due to the voltage of 18 V, the Hammer is able to tighten more fasteners without recharging, even inferior to the competitor in battery capacity.

To understand why a seemingly less productive screwdriver is inferior to a more powerful one, you can do a little calculation:

  • the amount of energy stored by the first model is 1.2 x 1.8 = 21.6 Wh;
  • the second indicator is only 1.3 x 14.4 = 18.72 Wh; i.e. 15.4% less.

In the process of choosing a screwdriver, it is advisable to take into account the presence of a spare battery in the kit. Some models even have 2 extra batteries. On the one hand, such equipment will cost more (especially since the cost of the battery is up to 80% of the price of equipment), but it will be much more convenient to work with it. At the same time, completing household tasks does not require an additional battery. the time it takes to work with it rarely exceeds 1-2 hours. Whereas in the process of constant use of a screwdriver (for example, for repair work or furniture assembly), the second battery allows you to not interrupt the work longer than several minutes. A discharged battery is charged, and a spare battery is installed in the device.

In the absence of the need for lengthy work, for which a screwdriver may be needed, buying a model with additional batteries is not recommended, not only because of its increased cost. Just the operational life of such a battery is small, and after a couple of years the user will have to buy a new part without even having consumed half the old resource.


Summing up the article, it is worth noting that the power of the screwdriver’s battery, although it is an important parameter when choosing the right model, the voltage and capacity indicators are much more important. And most often it is worth paying attention to the torque only if it will be used not only to screw in, but also to drill. You should also know that the maximum power of a cordless screwdriver of all commercially available models for a device with a voltage of 36 V, a torque of 60 Nm and a capacity of 3000 mAh. Such equipment is quite difficult and not too convenient to use without professional experience. And that means you should opt for less productive options produced by well-known and reliable brands such as Bosch, Hitachi, Makita, AEG, Dewalt and Metabo.

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How many amperes does a 14 volt screwdriver consume? I want to attach a power supply to it.
I thought maybe the PSU from the laptop is suitable (16V 5A), if it’s weak, then I think you can buy a power supply more powerful.

It consumes differently, from 5-7A in lightly loaded mode, up to 10-15 and even up to 20-25A in dir. puffs ratchet level. BP is not convenient, now there is a sea of ​​modern batteries: lithium-iron phosphate (LiFePO4), lithium-ion (Li-Ion) and lithium-polymer (Li-Pol), i.e. there is something to replace the old junk. In general, the problem is discussed in many forums, for example, look here, there is something to read on this issue:
http://electrotransport.ru/ussr/index.php/topic,3117.0.html?PH PSESS >

How many amperes does a 14 volt screwdriver consume? I want to attach a power supply to it.
And what is the capacity (in Ah) of the battery of your screwdriver?

PSU is not convenient, now the sea of ​​modern batteries. those. there is something to replace the old junk.
Yes, there is a replacement, but separately purchased batteries cost very, very much.
Z.Y. In the presence of a kit "Makita" with two Ni-Cd batteries of 12 V, 1.3 A / h, after a full charge with a standard charger, non-operating batteries, alas, lose their charge in 2.3 days, i.e. there is a significant loss of capacity. The tool kit was purchased in 2007, and was rarely used.

Yes, there is a replacement, but separately purchased batteries cost very, very much.
Z.Y. In the presence of a kit "Makita" with two Ni-Cd batteries of 12 V, 1.3 A / h, after a full charge with a standard charger, non-operating batteries, alas, lose their charge in 2.3 days, i.e. there is a significant loss of capacity. The tool kit was purchased in 2007, and was rarely used.

There is one good way to revitalize the Accom. This occurs in the acc. Ni-CD crystallization, and they poorly hold the charge. To destroy it, you need to submit for example. with high current. from welding KEMPI.Minus to minus acc., plus wire several times to read the plus terminal, smoothly. And you will be happy with another 200 charges, discharges of approx. Or a couple of acc. You can connect it to the last one from the machine. For Ni-Cd acc., it should be done once a month, do two full discharges and charge once a month. I have a screwdriver for 10 years already and works like a clock. But first, try 3-4 cycles a time. charging. Try heating, and let it cool for half an hour, each time. I’ve revived it like this the last time. But when it’s completely stake, then the above should be done. I rewind the start button with a wire until it stops. But look so that it doesn’t stand long at a stop. These acc. they don’t like deep discharge. Otherwise, it will be kirdyk. And every time you lose power, when you work, don’t be lazy, always discharge it to the end. This greatly affects longevity. I personally always do this, and it works for years.

With some work, you have to twist a lot of screws. You can, of course, do this manually using a screwdriver, but it requires considerable effort and takes a lot of time. To speed up the process, you need to choose a screwdriver. There are very inexpensive models. household ones. which, nevertheless, greatly facilitate the installation and dismantling of screws. And some may work in drill mode.

Household or Professional

As you know, professional screwdrivers are more expensive, but this is not accidental. They are made with a large margin of safety, for which better and more expensive materials are used. In addition, they have greater power, which makes it possible to screw longer self-tapping screws and / or work with more rigid materials.

The difference between a professional and a household screwdriver in a resource

To decide whether you need a household or professional screwdriver, evaluate the amount of work that will need to be performed. If you are starting a construction or overhaul, you probably need a professional or semi-professional model. If the tool will be needed periodically. something to unscrew / twist from time to time, more than enough household. With such work, the resource of the pros of the tool simply will not be in demand. So choosing a screwdriver by this criterion is not very difficult.

Battery or network

Having decided on the class, it will be necessary to decide whether you need a power screwdriver or a cordless one. The disadvantages and advantages of both are obvious: the battery has higher mobility and the cord does not interfere with work, but it weighs more. The network does not depend on the presence of a battery charge, but not all construction sites have power supply. In general, the choice is not easy. It may be decisive that a cordless screwdriver with a good battery is decently more expensive than a similar network-powered model. The difference is due to the presence of the battery. good options are not cheap.

With a power screwdriver, the length of the cord is important

If you decide to choose a power screwdriver, pay attention to the cable length. The longer it is, the more convenient it will be to work. you won’t have to carry it around anymore.

To choose the right screwdriver on batteries, you need to pay attention to the type of battery. The duration of work on one charge, as well as the order of storage, depends on this.

    Lithium-ion (Li-lon). It holds a charge for a long time, quickly charges, has a large number of recharges, almost does not discharge during storage. In general, a good option, but expensive. Therefore, it is probably more common on professional models, where the duration of work on a single charge is important. The disadvantages include the fear of cold, which is important in our country.

Lithium-ion batteries have a long resource, are not subject to self-discharge, but are expensive

Nickel-metal hydride batteries are a good option, but they do not have a very long resource.

The cheapest type of battery is nickel-cadmium, but they have a “charge memory"

So, if you choose a cordless screwdriver for periodic work, a nickel-cadmium battery will also work. If used carefully, it serves for a long time. If you start large-scale work, it is better to use other batteries. there will be less downtime, the work will move faster.

Cartridge type

The screwdriver’s chuck is of two types: key and keyless. The quick-clamping (usually has three petals) allows changing nozzles in a matter of seconds. the cartridge rotates a little by hand, the nozzle changes, after which it is again slightly rotated in the opposite direction. In addition, there is another positive point: in such a holder it is fashionable to install a nozzle of any thickness. The main thing is that the shank fit into the holder.

Types of chucks for a screwdriver

The same operation with a key cartridge requires a special key. It is inserted into a special socket, cranked until the nozzle is released. After replacement, the key rotates in the opposite direction. The disadvantage is obvious: you must have this key on hand.

By design, quick-release chucks can have one or two couplings. If there are two couplings, one of them fixes the cartridge, the second. the shaft. If there is one coupling, then there is a shaft lock button on the housing.

It is not difficult to choose a screwdriver for this parameter. usually all converge on quick-clamping. They allow you to fix the nozzles of large sizes, although they stand, other things being equal, a little more expensive.

Technical specifications

Once you have decided on the type of screwdriver and power, you need to focus on technical specifications. They determine which screws and material you can screw into.

Example screwdriver specifications

Rotational speed and torque

The force with which a screwdriver can turn a screw is determined by the torque. It can be very small for household models. 10-15 Nm, and can reach 130-140 Nm for professional ones. Therefore, professional screwdrivers can easily and quickly twist large self-tapping screws and work with hard materials.

But a large torque is not always necessary and not with all materials, therefore, screwdrivers provide the ability to adjust the applied force. There is a limiter for this. It is made in the form of a movable ring, which is located behind the chuck.

The higher the speed, the stronger the torque.

There is a mark on the ring, setting it opposite a certain number, you specify the maximum force that the tool can develop. Upon reaching this value, the cartridge will scroll to idle. the screw will no longer be twisted. The achievement of this value can be clearly traced. the ratchet is turned on.

Many screwdriver models can work, can work in two modes: the actual fastening of fasteners and drilling. Such models are called a screwdriver drill, but now they are the majority. To switch to drill mode, the switch is set to the extreme position (replacing the nozzle first). At the same time, the maximum revolutions are turned on, which allows you to drill even quite rigid materials.

Power screwdriver