How to correctly mount a cutting wheel on an angle grinder

inside diameter of a disc for an angle grinder

According to the purpose in accordance with the material to be processed, there are the following types of discs for angle grinder:

Let’s look at the marking, the main dimensions, the main manufacturers, as well as compare popular brands on the price-quality ratio.

Purpose of discs and attachments

Circles for the angle grinder are differentiated by purpose at:

Cutting discs

The most common task performed with an angle grinder is to cut various materials. On what material will need to be cut, depends on the choice of tool material.

  • Metal cutting. Metal cutting discs are made of crystalline alumina alumina corundum, as well as of synthetic corundum, called electrocorundum. The basic color of metal cutting discs is blue.
  • Cutting stone and concrete. For cutting stone, you should choose a disc made of another abrasive material, silicon carbide. This abrasive can easily cut white brick (sand-lime brick) and slate. But this material is not suitable for cutting red brick, some concrete or ceramic tile. Stone discs are available in green color.
  • Cutting ceramic tiles, red brick, porcelain stoneware and concrete. A diamond blade is already used for this application. This head is made of metal, the cutting edge is covered with abrasive material with diamond grit. The picture above shows a segmented saw blade designed for dry-cutting material. All-metal discs require water cooling when working.

Therefore, if you still intend to use a circular sawblade for wood, you must observe safety precautions. The angle grinder must have a protective hood and handle, and the user must wear a protective mask or goggles. In addition, this tool must not be used for cutting materials that are not intended for it.

The safest are considered to be discs for wood, on the end of which a chain from a chainsaw is installed. If the tool jams, the chain stays in place and the disc spins idly, reducing the chance of injury to the user.


If a layer of paint or other application is to be removed, or if rust is to be removed from the surface, pads are used. They can be disk or cup-shaped with an embedded metallic wire.

The wire in these attachments may be twisted or untwisted. Its thickness may also vary. The thicker the wire, the rougher the roughing disc or the cup-shaped nozzle, and vice versa.


For grinding and polishing various surfaces (metal, wood, plastic and others) sanding discs and attachments are used. Often a petal-type emery wheel is used for sanding. It consists of multiple “blades” made of sandpaper. The grit size of sandpaper can be selected according to the type of machining required (finishing or roughing).,

Also sanding discs can be attached to the sanding pad with Velcro. Such a tool is screwed onto the spindle of an angle grinder.

For polishing surfaces special wheels and nozzles are available that look like cushions made of felt or as discs of cloth.


To sharpen your tool, you usually use sharpening machines (sharpeners). But if you do not have the latter, but have an angle grinder, you can buy a grinding (grinding) wheel, which can easily sharpen almost any cutting tool.

How To Convert An Angle Grinder for Cut Off Wheels

The main difference between grinding and cut-off wheels is their thickness (at least 5 mm).

Discs for angle grinder (angle grinder): types, sizes, application. How to choose the right wheels for angle grinder?

The real boss for home and work needs must be an angle grinder. But without the right discs it is not always possible to achieve the desired result. That is why special attention is paid to their selection.

What is an angle grinder and what is it for?

Originally, the purpose of the tool extended only to cutting the inner corners of large and hard-to-reach parts. Hence the name. angle grinder or angle grinder. But later the scope of application has expanded, and today the main purpose of the angle grinder is cutting metal and stone.

Disc sizes

There are different not only angle grinders, but also their wheels. The first thing that catches the eye is the difference in the diameter of parts. According to this parameter, there are discs:

But the most common are the 125mm and 230mm diameters.

The smallest size that can have a disc. It is not often purchased. However, if you need to perform specific work, without it, sometimes you can not do.

Diameter is optimal for work around the house, which is required from time to time. It is a small and very handy tool, with which you can work with one hand.

Despite the fact that the size of circles is not as popular as others, they are sometimes chosen. For example, when you need constant work around the house, such as when carrying out repairs, the diameter of 125 mm will clearly not be enough. These tools are considered as semi-professional.

This disc is acquired when it is necessary to work constantly with thick material. The nozzle is characterized by high performance, and therefore it is chosen for professional purposes.

Types of discs by function

With an angle grinder you can perform various types of work. Special discs are purchased for this purpose. Certain types include:

For sanding of different degrees (it is possible to perform both rough sanding and mirror polishing);

For roughing out rust and paintwork.

Types of cutting discs

The most popular are discs, designed for cutting. Thanks to them, it is possible to cut any hard material, such as metal, concrete or stone. In some cases, this tool is indispensable.

Wood discs are considered traumatic. Therefore, in some cases it is better to find more appropriate tools for machining. But diameters of 115 mm and 125 mm are acceptable for this purpose.

Abrasive discs

Basically, abrasive discs are used for cutting metal and stone. They used to be brittle, so they were dangerous to use. But today such discs have a multi-layer structure, due to which the use has become harmless. The abrasive is placed between the layers. It scrapes off a thin layer of material to be processed. In this way, the cutting line is polished.

Diamond discs

The difference between these types is the application of crumb diamond on the outer radius. To avoid distortion when heated, there are also special expansion grooves that make the cut easier.

Types of grinding discs

Grinding wheels come in petal and abrasive. Both are equally effective. But when working with the abrasive kind also remove surface irregularities of the material, such as welding residues, burrs from metal and other. Petal discs function more gently. Hard elements can also be removed, but the relief surface will be processed better overall.

There are other types of nozzles. The Velcro bits have recently become very popular. They are purchased when it is necessary to perform frequent grinding of metal.

Other interesting nozzles are scrapers, which are successfully used for grinding and scraping various surfaces. It is often a good alternative to an abrasive emery wheel.

How to mount the disc properly?

To work with the angle grinder, it is imperative to comply with all safety requirements. These include the following.

How to correctly put the cutting disc on the angle grinder

Installation of the cutting disc on the angle grinder does not cause difficulties, if you follow simple rules. When installing the consumables are necessary:

  • A special wrench used to unscrew the nut that holds the disk against the angle grinder. It is most often included in the delivery of the power tool.
  • The sanding disc.
  • If you must remove the old clamped disc from the angle grinder before installing the new disc, you may need a chisel or similar tool to crush the old consumable.

The process of installing a new disc on an angle grinder follows this algorithm:

  • Place a wrench on top of the holes in the metal disc ring and turn counterclockwise.
  • After removing the old abrasive disc, install the new disc in the socket.
correctly, mount, cutting, wheel, angle

Important! Do not use excessive force when tightening the new sanding disc in order to avoid damaging it.

How to put a disk on an angle grinder: how to install and remove it? How to unscrew a disc if it is jammed? Which way it should be installed?

Cutting wheels do not have a programmed direction of rotation. That is why it does not matter which way you install them. But as mentioned above, installing the sawblade facing outward makes it easier to change the wheel (the abrasive side makes it harder to unscrew the nut). There are several other benefits to mounting them.

Guaranteeing a straight fit on the shaft

The metal ring increases the contact area. So when the disc is mounted on the shaft and the nut begins to tighten it, the pressure is distributed evenly. It guarantees a straight cut-off disc seating and reduces the risk of damage due to misalignment.

cutting disc safety basics-How to properly use an angle grinder with cutting disc

Comfortable insertion of the disc

Installation of abrasive wheel to the outside provides yet another advantage. you can always visually see exactly what attachment (for metal or stone) is installed on the angle grinder at the moment. They are not interchangeable, and a fault could have serious consequences. For example, when trying to use a metal cutting disc to cut through concrete, it can be destroyed and the resulting chippings can injure the craftsman. So installing the abrasive wheel with the label facing outward will ensure not only convenience, but also safety of work.


In the instructions of many angle grinders, for example the Metabo WP 850, it is clearly stated that “the metal flange of the wheels for abrasive cutting must be against the supporting flange”. Manufacturers give such recommendations for a reason, as they ensure safe work with the tool, reducing the risk of serious injury to the master.

Over 70% of all activities that an angle grinder performs are cut-off jobs. The tool cuts almost all materials. from metal to stone, but you need to study the instruction manual for the consumable when choosing. There are some models of angle grinder and cut-off wheels that do not perform certain functions, such as cutting wood.

  • To work with metal, are used to handle profile pipes, sheet metal, steel, rebar or channel bars;
  • For working stone, such as paving stones, paving stones, sand-lime bricks;
  • For working aluminum;
  • For working with stainless steel;
  • For working cast iron.
  • . Used for cutting work on metal, stone, concrete, stainless steel, aluminum They are used for stripping metal layers from surfaces or welds, removing burrs and scale.

  • CLT (end flap discs). They are used for grinding of metal, stainless steel, wood and other surfaces.


If you had to use a gas wrench, you must remember about the very powerful shoulder of such a wrench and the force applied to the parts of the “angle grinder”. If you are not careful, you could break the spindle lock or damage the gearbox.

All manipulations with the disc of angle grinder should be performed with the power supply completely disconnected (the plug must be removed from the socket). Any unintentional pressing of the start button will cause the electric motor to turn on, and the rotation speed of the rod is very high. Injuries cannot be avoided.

Work with “angle grinder” involves a lot of waste in the form of metal or wood chips and dust. Before you begin work, wear special safety glasses: they will protect your eyes from the splinters of the cutting wheel itself in the event of jamming and destruction.

Goggles are not only a safety feature. If the eyes will be protected, you can pay more attention directly to the work of the “angle grinder”, to ensure the correct cut or choice of the correct mode of operation. This will allow the most efficient use of consumables (cutting wheels) and minimize the emergence of abnormal situations with jamming of the disc or its destruction.

A mask that completely covers the face is an excellent substitute for glasses; it is especially important for a master with poor eyesight who wears dioptric glasses, on which safety glasses cannot be worn.

The disc on the “angle grinder” can be set up on its own or on its own, depending on the direction of rotation and, accordingly, the flow of swarf. It makes no fundamental difference in operation. However, the “angle grinder” with the wheel “on itself” when jamming the disk tends to jump out of the cut forward, not on the one who is using it. This is especially important with high-powered tools, but a small angle grinder can also pose serious dangers.

A specially mounted extension cord with socket, preferably without grounding, helps to quickly stop the work of the machine that has escaped from the hands.

“angle grinder” is a coarse tool and one should not strive to get a perfect surface as a result of its work, the main thing is to make a coarse cut, which later, if necessary, can be processed by other methods.

Which side of the gearbox should the cutting wheel be mounted on the grinder (angle grinder)

Ignoring safety precautions when working with power tools is fraught with serious consequences. This is especially true when using grinders, saws, planers. Before you start using the device, it is imperative that you familiarize yourself with the manual. If you don’t have a manual, it’s worth taking advice from experienced users. And here it is necessary to say: be careful! You don’t have to take the first tip you see blindly. Why? It’s simple: you can come across recommendations of those who have hardly ever held an angle grinder in their hands.

Which side of the metal cutting wheel should be mounted on the grinding machine? This is not always thought about, fixing the abrasive “as it turns out”. This is not a correct approach.

Let’s turn an angle grinder into a grinder

In general, frankly speaking, an angle grinder is an angle grinder, a grinder otherwise. But, being a universal tool, it is used for different purposes and for each task the unit should be prepared separately. In order to grind with an angle grinder need a supporting wheel. It is placed on the tool shaft itself.

If you plan to sand wood, you need to glue sandpaper on it. It is for you to decide what grit size it will be. It depends on what purpose you are sanding the material. It is very convenient to use ready-made sanding discs with a sticky surface on the back side. They can be quickly changed if necessary.

If you need to work with concrete, you will need a dust cover. You can connect a vacuum cleaner to it and there will be much less debris. On sale you can find special covers that have a sliding part. This helps you sand corners, which is very handy.

For metals, you will need standard circles for this material. They come in different sizes, thickness, and grit sizes. If the metal with which you plan to work is very rusty. first work with it with a special brush, and only then connect the angle grinder.

How to mount a cutting disc onto an angle grinder correctly

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