Which bits for a rotary hammer drill?. Cutting tip

Drill bit for a concrete drill: types, best brands

Drill bits for peorator: types, manufacturing material, types and characteristics of shanks. Design and construction of the chuck for the rotary drill. How to properly install the drill in the chuck and remove it.

Drill bits for peorator and other products are available at low in Leroy Merlin. Select the product you are interested in on the website and buy it in our online store. The range of products presented in the catalog is extremely wide. Among them you can find a product that suits all your needs.

All represented in the section “Drill bits for torches” products are produced by well known and well proven high quality of their products.

You can always order and pay online on the official website of Leroy Merlin in Russia. For residents of Moscow region we have not only low for products from the category “Drills for saws”, but also fast delivery to cities such as Moscow, Balashikha, Podolsk, Khimki, Korolev, Mytishchi, Lyubertsy, Krasnogorsk, Electrostal, Kolomna, Odintsovo, Domodedovo, Serpukhov, Schyolkovo, Orekhovo-Zuevo, Ramenskoye, Dolgoprudny, Pushkino, Reutov, Sergiev Posad, Voskresensk, Lobnya, Ivanteevka, Dubna, Yegoryevsk, Chekhov, Dmitrov, Vidnoje, Stupino, Pavlovsky Posad, Naro-Fominsk, Fryazino, Lytkarino, Dzerzhinsky, Solnechnogorsk, Istra and Zhukovsky.

Material and types of drills and drills

The basic material for the production of drilling bits is steel of different kinds:

For work with the toughest surfaces. metals, hard stone. the drill tip is additionally equipped with diamond tipped tips. According to the type of construction, drills are divided into:

The color of the drill bit will also tell you a lot about the drill bit:

  • Black. The drill bit has been pre-treated with superheated steam. Contrary to the well-known statement that black bits are tougher than all the others, it is not true. No effect on durability.
  • Brown. Such drills are tempered beforehand to remove internal stresses.
  • Gold, bright gold. The tip of drill bits in these colors have a titanium nitride coating. It adds strength to the drill bit, but so does the cost.

Types and parameters of drills. distinctive features

Builders ask, choosing a drill bit for concrete, how to distinguish its performance and make the right choice. Each product is different in size, available in a given diameter and length. One of the small drills for concrete works. 4-5 mm, to drill a thinner hole of this diameter is no longer possible, its depth will be about 5 cm.

If you need to make a deeper hole, you need to take a larger diameter element, because the types of drills are made by the size directly proportional to its length.

For example, at diameter of 12 mm or more the auger will be long 1000 mm, it will be enough to make through-hole in all walls except a bunker. The largest diameter is about 30 mm, it is not easy to work with it, there is a heavy load on the torch, it takes a long time to cool down.

If it is necessary to make a larger hole, a core drill is used, which has a centering drill bit and a crown around. Thanks to it the process is fast enough, and the load on the rotary drilling machine is small.

The core drill is diamond-coated or lined with pobedite. Drill bit with pobedite tip is set in drill and impact mode, with diamond tip in drill mode.

Pobedite drills

Pobedite as an alloy was developed in 1929., Cobalt and tungsten, where 10% is cobalt and 90% is tungsten. Can effectively cut through brick, cinder block, concrete. The drill can crumble and cut concrete, it withstands the impact load quite well, and there is no deformation of its cutting edges. Steel products are subject to deformation and do not work as effectively.

The technology of obtaining the alloy at a low cost, the alloy was developed for installation work, which requires drilling of complex structures.

  • Drilling holes for electrical installations.
  • Pobedite drill bit can be used for making holes for anchors and other fasteners.
  • Channels when installing bonding elements in walls during building box construction.
  • Dismantling of concrete structures, drilling large diameter holes for the installation of ventilation, sewage systems.
  • Mounting work on fasteners when assembling and installing furniture, fittings.
  • Working with fragile materials, such as ceramic tile, glass.
  • Drilling in hard rock, hard alloys.

One of the advantages of the work is that there is no need to apply excessive force on the bit from pobedite.

Choice of diameters

The diameter of the drill bit is chosen taking into account the fact that when working with dense material such as concrete, runout occurs during operation. As a result, the hole comes out somewhat larger in size than planned. For this reason, the diameter needs to be slightly smaller than the planned hole. The length of the element indicates the greatest depth to be drilled.

Most popular grades

The best concrete drill bits for drills from foreign manufacturers:

These products are considered to be of high quality, so they have a high price, especially Bosch products, which have a four-spiral design.

drills are in the medium price range, and therefore have a short service life. Products from Chinese manufacturers may also be of good quality, but only if they belong to the appropriate price category. In the construction of buildings and other Russian cities, workers often use the listed brands of products.


Core bits or annular drills, are used for drilling large holes with a diameter of 22 to 127 mm. With their help it is easy to drill a hole for wiring or any fittings. Wood crowns consist of a drill bit and a hollow core bit. A single drill bit holder is sufficient for the operation of nozzles of different diameters. Almost all drills have hexagonal (not round) shanks for better adhesion to the chuck.

Given the nature of the work, hollow bits should be made of durable material. The best quality crowns are made of bimetallic steel and cobalt. The bigger the bit diameter, the more cutting teeth you have on the edge. Note that some teeth are in the shape of a regular triangle and look straight up, while others have a 30° to 40° inclination towards rotation (clockwise).

8Pcs SDS Plus Flat Tip Electric Rotary Hammer Drill Bits Set for drilling concrete general purpose

The most popular diameter is 68 mm, as it is used for making undercuts in wooden walls and sandwich panels. Beside 68 mm crowns 20, 25, 35, 40 and 51 mm are considered popular on average. other sizes are used very seldom in everyday life. If you buy them for your home, we recommend to buy a set at once to save money. So you can take a set of Bosch drill bits 2608580868, which in addition to wood can also drill sheet metal up to 0.8 mm thick.

Chucks used by the tool

It is desirable to talk about chucks in detail, so that the user better understands the principle of their work. so it will be easier for him in the process of changing the drill.

The first use of these devices dates back to the 1930’s. As a result of developments, manufacturers came to the conclusion that the simpler the design, the more reliable the fixation.

The main advantage of the key pattern is that it fastens the drill as securely as possible in the peorator.

When to Use SDS Plus VS When to Use SDS Max and the Differences Between Them

Quick-action chucks are tightened by the operator’s hand. Depending on their design, they are divided into models with one and two sockets. How they work varies from chuck to chuck.

The easiest to cope with one-jaw clamp, but use it only in conjunction with drills and rotary tools, which are equipped with an automatic locking of the working shaft. You can use just one hand to attach the nozzle, which makes it easier to work.

To use the double-clutch clamp, it is necessary to hold the rear coupling with one hand and rotate the front shaft with the other.

What is a torch cutter for concrete

A peorator drill is a special drill bit designed for drilling holes in high-strength materials. drills differ in many respects: their construction, the type of tailstock and their geometry. They are selected individually for each application.

The drill differs from the drill bit in that it drills holes by means of percussive-rotary movements. That makes it possible to make deep holes (up to 1,000 mm) in high-strength structures, which are extremely problematic and often impossible to drill with conventional drills.

However, in the process of such drilling you often have to make reciprocating movements to extract the dust from the hole being drilled. The tip of the drill hole is mainly equipped with a crown (most often consists of several cutting segments), which significantly increases its service life.

Important! the most important thing is not to bite the bit while drilling, otherwise it can break or jam. Reversing is used in some drills to retrieve the bore. Also, the shank needs to be lubricated regularly to reduce wear and tear.

The drill differs from the drill and the shank (the part that is fixed in the chuck). The drill is mainly held in place by sliding jaws. For boreholes, there is a special chuck with retaining balls. Drills with a chisel function are available on the market today, but they are ineffective for working with hard materials.

How to choose the right drill bit: recommendations

Before you go to the seller or to the market for a drilling tool, you have to know what to buy. The following factors influence the selection of the drill:

  • Shape and material of the cutting tip. Two pointed wings are suitable for ordinary drilling work. To make a hole for a socket, for example, you need a larger handpiece with a larger crown. It is better to take a cutting plane made of diamond-powdered tungsten carbide.
  • Helical thread type. Small angle of inclination allows to go deep into the base. up to 800 mm. The rotary speed increases as well. But drills with such a characteristic wear out faster than those with a flat thread. This option allows to reduce load on the cutting plane.
  • Manufacturer. It is better not to economize on spare parts. Firstly, it is not the most expensive tooling anyway. But what is more important. drills and core bits of well-known brands. Bosch, Makita, Metabo. increase safety at work. They are unlikely to backlash, loosen the chuck, fall out, i.e. create a risk of injury. In addition, bits from unknown manufacturers or no brand at all may not fit the chuck parameters.

Read more about what a drill bit should not be, tells

Summing up, we can say. it is necessary to choose the size of the drilling tool based on the specifics of the planned works, chuck parameters, shape and material of the tip, the type of spiral thread.

Types of wood drill bits


They are very similar to metal drill bits in design, so they are often confused when buying them in a store. There are, however, some differences. First, there is a tip on the end of the drill bit with a sharpening angle of 50°. 80°. When drilling, it bites into the wood and centers the drill bit throughout the entire operation, making the hole perfectly straight.

Also, a wood screw drill bit often has a wider groove for chip evacuation than a metal bit, for the same size and thickness. Wood drill bit should never be used to drill metal products.

Feather drills

A feather drill bit is shaped like a spade with sharpened cutting edges and a sharp tip. Like the twist drill, the point is used to center the drill around the workpiece. The feather bits are ideal for drilling coarse holes in wood from 12 to 55 mm in diameter. Feather bits are relatively inexpensive. for 70 to 80 you can buy a sturdy drill.

However, when working with a feather drill bit it is worth remembering that it has no chip drain, so after 1 cm of drilling it is necessary to take out the feather and remove the chips. Also, it regularly needs to be visually centered, because it tends to go sideways when drilling.

Levis spiral

These drills are also called auger drills. They are somewhat similar to screw drill bits with the difference being the number of grooves that take the chips out. here it is one. The tip has a thread, like a self-tapping screw, so that no additional pressure is needed during drilling. the bit goes in by itself. The advantage of using such a drill is that you can get a perfectly smooth inner surface of the hole. After drilling, it looks as if someone polished it from the inside.

Wood auger drills cost about 2,000 to 2,500. They are quite fragile, so it is better to drill with them at low speeds, but with high torque. The drill bit is also occasionally guided to the side. The problem can be solved by pre-drilling the hole with an ordinary screw drill.

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Förstner drill bit

These are quite complex drills, designed for drilling large ideal-shaped holes of 20. 50 mm. Here, in addition to the cutting edges, there are radial cutters arranged in a circle. They undercut the wood fibers, which then remove the drill bit edges. It makes perfectly round, smooth holes. At the base of the cutting part of the drill bit there are two inclined channels that are responsible for chip removal.

The Forstner drill bit is often used in furniture production to obtain perfect large holes. True, such drills cost 2 to 3 times more than conventional screw drill bits. On average, a good drill can be bought for 250 to 300.

Safety precautions

Basic safety rules for drilling concrete walls:

  • When using a diamond tool, wear protective clothing for the operator. The eye protection kit includes goggles to prevent fine dust from getting into the eyes.
  • The working tool may not be dropped and must not be hit. Before drilling in concrete, check that the tool is securely seated in the chuck.
  • Local statutory requirements must be observed when carrying out repair work. For example, it is allowed to make repairs in residential premises from 09-00 till 13-00 and from 15-00 till 19-00.

Because electrical cables are inserted in the walls, all work must be done after disconnecting power supply to the room. Power to the tool is supplied from a separate outlet connected to the switchboard. When using a water-cooled tool, make sure no liquid can enter the electrical connections.