What is a bit for an electric screwdriver for?

Drywall bit for electric screwdriver

Such nozzles are distinguished by the presence of a limiter, which does not allow the self-tapping screw to be tightened deeper than necessary. When screwing the fasteners into the wall, the stopper rests against the drywall, which will allow the self-tapping screw to be screwed into the sheet to the required depth. Due to this, the speed of installation of drywall is significantly increased.

Impact Bits for Electric Screwdriver

There are also impact screwdrivers. It is necessary to insert special bits into them, since ordinary ones will not withstand shock loads. They must be strong and durable. If you will need to use a hammer bit intensively, it is best to choose a diamond-coated bit. Such a bit will be distinguished by increased strength, as well as good adhesion, so it will not slip or grind off during work.

Electric screwdriver bits

Nowadays, the use of nails in the construction business is less and less common. Screws and self-tapping screws are much easier to drive into wood or metal using an electric screwdriver. It is used both in large-scale construction and for domestic needs.

To securely fasten the elements with self-tapping screws, you need to choose the right bit for an electric screwdriver. What are they and how to choose them correctly? The answers to these questions are given in this article.

Cross bit for electric screwdriver

  • Ph (Phillips Slotted Mount). A simple slot designed for screwing in self-tapping screws that do not have additional notches.
  • Pz (fasteners with Pozidriv slot). An improved version, which is used for self-tapping screws with additional notches.

What is a bit for an electric screwdriver?

A bit is a special attachment for an electric screwdriver, a drill, which helps to tighten screws, bolts and other fasteners. On one side (which is inserted into the chuck of an electric screwdriver), it has the shape of a hexagon. Their classification is carried out by how the back side of the nozzle looks like, what material it is made of, and also where it is used.

Strongest electric screwdriver bits

In order to choose the strongest bits, you need to pay attention to the material from which they are made. If the packing is made of an alloy of molybdenum and chromium, vanadium and chromium, or molybdenum and vanadium, it will last a long time. Silicon-magnesium attachments are distinguished by their durability.

Magnetic bit for electric screwdriver

According to the method of fastening in the cartridge, they are distinguished:

  • Magnetic bits. They are attached to the chuck by the magnetic field of the extension glass.
  • Spring loaded. They are rigidly fixed in the chuck.

The convenience of magnetic bits is that they are very easy to replace. However, this does not affect the work. during operation, they do not slip and do not fall out of the cartridge if they are inserted correctly into it.

Types of bits for a screwdriver. What and what to twist

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Anyone who is engaged in construction, repair and at least once held a screwdriver in his hands, knows that turning screws is quite a dreary business and requires time and effort, and if there are thousands of them You simply cannot do without an electric screwdriver and a bit. Bit. a special nozzle with which you can tighten and unscrew screws, nuts, bolts. There are many types of bits, each type of fastener has its own nozzle. Let’s consider them in more detail.

It is marked ph (stands for Philips). There are several sizes, from to, the larger the number, the larger the cross, and accordingly, the larger the screw it is intended for.

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The first cross is suitable only for self-tapping screws with a diameter of 2.5-3mm. Cross number 2 is the most common bit; it is suitable for black self-tapping screws for metal, wood, galvanized self-tapping screws with a press washer. These are the most common types used in construction, repair, in everyday life. Cross and is used quite rarely, mainly when repairing large-sized items, cars.

There are Tin (titanium nitrite) coated cross bits,

Bosch Tin Coated Cross Bit

is done to increase wear resistance, the company “Bosch” produces such, it is easy to recognize by the yellow coating. The length can also be different, from short 25mm to 150mm, it all depends on the nature of the work and the shape of the part, the workpiece with which you are working. If a long length is required, then you will need a special extension cord (up to 300mm in size), which has a flexible shape, which allows you to work in hard-to-reach places.

Used for yellow (yellow passivated) self-tapping screws, they are white. Also available in several sizes. For self-tapping screws with a diameter of 2.5 mm, nozzles are used, for 3.5-4 mm. a nozzle, if a self-tapping screw over 4 mm. a nozzle, the same is suitable for tightening anchor frame bolts. Unlike the Ph nozzle, the Pz has additional notches and also looks like a cross. In case you do not have Pz at hand and you need to tighten the yellow self-tapping screw, you can use the usual cross Ph.

Used to tighten socket head screws. For example, if you are assembling furniture, you will need a 4mm hex bit, it is suitable for a confirmation (furniture screw). The assembly process is noticeably faster than manual assembly.

Designed for twisting hardware with an external hexagon. The most common is 8mm, suitable for roofing screws with a diameter of 4.8mm. For a 6.3mm self-tapping screw, you need a 10mm bit. Since the diameter of the self-tapping screw is rather big, you will need a sufficiently powerful electric screwdriver. (How to choose the right electric screwdriver).

Size range from 6mm-13mm. There are magnetic, there are simple ones, it is of course more convenient to work with a magnet, the self-tapping screw does not fall out, their cost is about 1.5 times higher than in conventional ones.

Asterisk bits (marked with the letter “T”. Torx hole)

These are used in household appliances, cars. Size range from T8-T40. There are, of course, T5, T6, T7, these are used to repair cell phones and are sold only with separate screwdrivers, or in sets. They are very thin and cannot be twisted with an electric screwdriver, accuracy and precision are needed, therefore only manually. It must be borne in mind that stars come with an internal hole, also without it, you should pay attention when buying.

Used when working with screws, screws. There are several sizes, measured by the width of the tip in millimeters.

There are combined bits, such have on one side, for example, a cross, on the other flat (slot).

There are very specific bits, like a double pin, looks like a flat one with only a slot in the middle.

Tri-wing bits, looks like a cross, only has three edges.

The bat looks like an ordinary cross, but its edges form a not quite perfect cross, slightly displaced. The use of such bits is very rare, it is unlikely to be needed for domestic purposes, rather when repairing household appliances and equipment.

Always choose the right bits so that it fits snugly in the screw, this will extend its life.

Bit for drywall. This one has a special limiter, when the self-tapping screw reaches the stop, the limiter does not allow it to go further, this allows you not to spoil the appearance of the cardboard, save time.

If you use several nozzles at once, constantly change them, it will not be superfluous to use an adapter for bits, a special device that allows you to change the nozzle without unscrewing the chuck of an electric screwdriver.

In principle, if you need to turn the self-tapping screws, but there is no electric screwdriver at hand, or there is none at all on the farm, then it is quite permissible to use a drill. Of course, a certain skill will be required, because it does not have a friction clutch and the cartridge will not stop twisting when the screw is completely screwed in, you need to work slowly, very delicately own the start button, otherwise you can roll not only the bit but also the screw.

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General tips for buying bits

Knowing the basic types and characteristics of bits, you can give recommendations on their choice. If you need bits for housework, we recommend that you refer to the next section. it discusses the question of choosing a standard set of tools. If you are forced to use bits often and not only for household chores, then pay attention to the section on choosing an extended set of bits.

When choosing bits, you should pay attention to their appearance and marking. On one side of the bit, its type and size must be applied, the metal and brand of the tool can also be indicated. You should be careful to buy “unnamed” bits without marking. there is a risk that they are made of ordinary carbon or low-alloy steel, and on the first use the slot will deform and will be unusable.

If there is such a need, choose bits with a special anti-corrosion coating, usually it has a golden or other color different from the color of the bit shank. Although in most cases, ordinary bits do their job and save money.

Electric screwdriver bit set

What are the bits for?

Nowadays, the use of nails in the construction business is less and less common. Screws and screws are much easier to drive into wood or metal using an electric screwdriver. It is used both in large-scale construction and for domestic needs.

To securely fasten the elements with self-tapping screws, you need to choose the right bit for an electric screwdriver. What are they and how to choose them correctly? The answers to these questions are given in this article.

Hex and square head bits

Hexagonal (marked with H or Hex. from the English hexagon) and square bits (the so-called Robertson slot) are available in sizes from 2 to 7 mm. Hexagonal bits can be standard and protected. with a hole in the end surface.

Magnetic bit for electric screwdriver

According to the method of fastening in the cartridge, they are distinguished:

  • Magnetic bits. They are attached to the chuck by the magnetic field of the extension glass.
  • Spring loaded. They are rigidly fixed in the chuck.

The convenience of magnetic bits is that they are very easy to replace. However, this does not affect the work. during operation, they do not slip and do not fall out of the cartridge if they are inserted correctly into it.

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Phillips bits (Philips standard)

Standard 55 ° Phillips slot, each slot widens downward, the sides of the splines can be smooth or grooved. Bits are available in five sizes. from to, the most common bits, bits of small numbers are suitable for working with screws with a diameter of less than 3 mm, bits and, on the contrary, are suitable for working with large screws (they do not have a pointed working part).

Bit size for electric screwdriver

Their slot width can vary from 2 to 9 mm. Thickness. from 0.3 to 1.6 mm. The length of a standard bit is 25 to 90 mm. However, there are also longer attachments for tightening fasteners in hard-to-reach places. Their length can be 110 mm, 125 mm or 150 mm.

A bit always has its width written on it, but sometimes its thickness can be specified as the second parameter. These values ​​are often proportional.

Long bit for straight spline

Thanks to the extended part of the device, it is possible to more accurately carry out the necessary work. When used, the tip of this nozzle is firmly placed in the head of the screw or screw. With the help of this bit, it is convenient to carry out small editing processes. A distinctive feature of these devices is the length of the nozzles, which ranges from 50 mm to 100 mm.

Classic straight slot bit

Width and thickness are the two main dimensions for a straight slot. In most cases, only the first parameter is specified. It ranges from 3.0 to 9.0 mm. The second parameter is often not indicated, but its value can range from 0.5 to 1.6 mm. The peculiarity of such marking is associated with the fact that the width and thickness have a standard ratio. The surface of the flat-toothed bit is protected against erosion and is characterized by increased hardness.

electric, screwdriver

Slotted bit with TIN coating

These bits are golden in color as the surface of the bits is coated with titanium nitride by a CVD chemical process. Thanks to this, the fixtures have a solid surface. Such nozzles may differ from each other only in width. This value ranges from 4.5 to 6.5 mm. Even in the marking of the devices, their thickness can be indicated. This value is in the range from 0.6 to 1.2 mm.

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Classification and types of bits for an electric screwdriver

In our time, construction and installation work has become very much easier. This, among other things, is facilitated by a huge number of fasteners that are very easy to use with an electric screwdriver or electric drill. Nails are now being used less and less.

Both hobbyists and professional craftsmen are increasingly preferring screws and screws, as these fasteners provide the most durable fastening. However, for each fastener, its own attachments are used, without which your electric screwdriver turns into a useless toy. To make it easier to navigate the variety of attachments, we present to your attention the classification of bits for an electric screwdriver. You will find out what types and sizes of bits the industry produces and for which fasteners this or that bit is used.

Bits for straight slot (Slotted)

The very first screwdriver was invented for a straight slot, it was invented in the 16th century. It was widespread during the Soviet period. Today, there are also types of bits for an electric screwdriver made for a straight slot, but they are used less often. Such nozzles are designated with the letter S. This marking is located on one of the edges of the bits.

The Latin letter S is an abbreviation for the English word slot, meaning “slot” or “slot”. There is also an alternative designation. slotted. This word when translated into Russian means “slotted”. There is always a number next to the letter indicating the width of the blade. In some cases, its thickness is additionally indicated.

The ratio of the width and thickness of the most common bits for straight splines:

Next, consider some types of bits for straight spline.

Phillips Bits

The cruciform bit first appeared in the first half of the 20th century. This was facilitated by the fact that when using fasteners and screwdrivers for straight slot in the automotive industry, when assembling parts, they often slipped out of the caps of the screws and screws, which led to damage to the varnished coating of the vehicle. Also, fasteners often broke threads due to the fact that torque limiters had not yet been invented, which later began to be used in mechanical screwdrivers and screwdrivers.

All of these reasons contributed to the fact that in 1933 John Thompson invented the Phillips head screw. After 3 years, the patent for this invention was acquired by Henry Phillips. This engineer refined the production technology and in 1937 invited Eugene Clarke, who was a large manufacturer of metal products, to hold a competition who would quickly screw the screws.

Naturally, Henry Phillips won the competition. After that, a new type of attachment attracted the attention of US automakers, but the Second World War soon began. Therefore, the cruciform slot appeared in Europe, along with the supply of American military equipment.

The first cruciform head was called “Phillips” in Honor of Henry Phillips. Bits of this kind are marked with the letters PH. They are followed by a number that is rigidly associated with the diameter of the outer thread of the fastener. This standard is used for all types of cross-bit bits.