How to change the wheel on the angle grinder

How to unscrew if it is tight, jammed, jammed, does not unscrew

In the process of operation of household grinders, even experienced users, not to mention beginners, jamming of the working tool happens. The difference between them is that an experienced user knows how to fix the problem and calmly without excessive fanaticism will lead the angle grinder to its original working condition. For the beginner, you should study the following theoretical information and apply in practice, depending on the particular case.

Why does it jam?

The reason for jamming disk serve deviations in the choice of modes of operation of the angle grinder. If, for example, you sharply increase the pressure on the angle grinder during work, the working tool will experience an increased torque. Given that the direction of rotation of the disc coincides with that of the screwing nut, the torque contributes to pressing the clamping device into the body of the disc, the value of friction force reaches a value capable of causing the adjoining surfaces to grip. Usually such a problem occurs when cutting thick metal, if the direction of the angle grinder to exercise only in the vertical direction, without additional back and forth motions.

How to unscrew the disk mount

The options for unscrewing the clamping nut of an angle grinder depend on its design.

On domestic grinders uses a special pin wrench that pins into the 2 (4) holes made in the plane of the clamping device, thereby creating an unscrewing force through them. The floating nut, the head of which is made in the form of a hexagon, the usual wrench is used, it may also have holes for pins. Before the unscrewing process, do not forget about the fixing of the spindle shaft with a special lock, which is located on the gear housing.

Makita GA6040C angle grinder (angle grinder) with disc and wrench. Picture by 220Volt

No wrenches are required on professional lathes, the design of the nuts (quick-clamp, flange) makes it possible to unscrew the disc with the efforts of only your hands.

How to unscrew/unscrew a jammed/jammed anchor nut, which way to unscrew

Before you unscrew the clamping device, especially if it is jammed, you should clearly understand the direction of the effort.

Start unscrewing the clamping nut of the household angle grinder with the usual auxiliary tool. pin or spanner (ring spanner). If the clamping device is too tight and the standard methods are failing, other tried and tested methods should be used.


Users of household grinders have come up with many ways to unscrew a jammed clamping nut without a wrench. Among them, there are options, the use of which can adversely affect the performance of the angle grinder.

  • Using a blowtorch or gas torch to heat up. Such poorly controlled heating can adversely affect the mechanical characteristics of the metal and plastic parts of the angle grinder in the heating zone.
  • Using the torch in the “jackhammer” mode. The tip of this power tool directs increased forces on the clamping device through the holes in it. The amount of torque can also be increased by using a gas wrench. However, these methods have a very significant drawback: they can disable the entire angle grinder (break the lock, bend the spindle shaft, damage gear teeth).

The safest way in which the angle grinder will retain its functionality is to completely destroy the jammed, and most likely broken disc. The following video shows the basic steps to fix a jammed disc problem:

  • the disk edges break off manually or with pliers to the outer diameter of the contour of the clamping nut;
  • clamp a thin (slightly less thick than the disk) metal plate in the vise;
  • turn on the angle grinder and grind with the support of a metal plate the rest of the disk under the nut;
  • after releasing the clamped surfaces from each other, the nut can be unscrewed with a standard spanner or by hand.

There are other similar videos on the Internet, such as the following. However, there is a fundamental difference between the two, related to the safety of the work. So the author of the video offers to clamp in a vice an angle grinder, and remove the rest of the disk with a metal plate in the hand of the user. Warning: never use this method, any wrong hand movement can cause injury.

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If a diamond disc is clamped instead of a conventional cutting disc, you should take advantage of the peculiarities of its design. It has slots all around for better heat dissipation. With the help of self-tapping screws, the angle grinder through these slots is firmly attached, for example, to a wooden base. Now the body of the angle grinder will be the place of application of the unscrewing force and gently, as shown in another video, it should be rotated back to loosen the clamping diamond disk. Then as in normal mode.

How to Avoid Jamming

To reduce the risk of the disc jamming, correct installation of all the components included in the mounting system.

  • The working disk has a metal ring on one side and not on the other. Important: Mount the side with the ring on the gearbox base.
  • Place spacer material on the side without metal ring. You can buy it in a store or make it yourself from cardboard, paronite, plain paper.

This order of installation will ensure that the domestic angle grinder will unscrew/screw the clamping device in the normal mode for as long as possible.

The correct mode of operation of the angle grinder, which primarily affects the jamming of the nut, will be honed with experience.

How to choose and replace a disc on an angle grinder

The main spare part of an angle grinder (angle grinder) is a replaceable cutting tool. The abrasive disc, rotating at high speed, cuts, grinds or polishes materials. For metal processing, discs are made of abrasive grit, steel cutters are used for wood, and metal discs with diamond coating are used for stone. Special attachments. brushes, petal sanding discs additionally expand the capabilities of your angle grinder. Below we will learn what kinds of discs are available, how to correctly remove the old and put a new one, as well as consider possible problems that arise in the process of replacement, and ways to solve them.

Types of discs for angle grinder: how to choose the right one

Industry produces angle grinder and discs for them in standard sizes: 115, 125, 150, 180 and 230 mm. angle grinder from 180 mm used for cutting stone. The most common size of machines for home and cottage use. 125 mm, they produce the most discs and accessories.

Warning! Always match the disc to the size of your angle grinder. Smaller diameter discs can be used in the angle grinder. But it’s extremely dangerous to remove the cover and put a disc with a larger diameter!

DEWALT Product Guide. Grinder Guard and Wheel Installation

We suggest dividing discs by their function: cutting, grinding, sharpening and peeling. Let’s consider each kind in details.

Cutting through metal

Inexpensive steel disc from Luzhsky factory

Cutting materials is the most common repair and construction task; a simple metal cutting wheel easily cuts through steel bars, roofing iron, or plastic. These discs are made of alumina (crystalline alumina) or electrocorundum (synthetic alumina).

When buying, we recommend that you read the label on the disc or packaging carefully. Metal cutting disc is indistinguishable from a stone disc.

Sawing stone

The Luzhsky factory manufactures a budget disc for stone

For cutting stone we recommend to take a special disc, they use a different abrasive. silicon carbide. It can handle white sand-lime brick and slate. But red brick, glazed tile and concrete will not yield to it. it is necessary to take a diamond disk.

For work at home and in the country we recommend discs of Luga factory. They wear out and dust quickly, but only cost 15-20 apiece.

Sawing wood

Such discs are produced for angle grinder as well

The discs that cut wood are very similar to the blade of a circular saw. Actually this is a disk for a circular saw, but the seat diameter of 22,2 mm is suitable for a spindle of angle grinder.

Warning! We do not recommend home masters to saw wood with a manual angle grinder. A tool that is thrown away by the recoil will cause serious injury.


As you know, diamond is a very hard mineral, so diamond discs can easily handle red brick, porcelain tile. The main material to be cut with diamond discs is concrete.

Handle diamonds with care. a disc should not cut into steel and should not overheat. After only two minutes of concrete sawing the disc will be very hot. take a break. Slots around the circumference of the dry cutting disc for cooling.

discs are produced for wet cutting of ceramic and porcelain tiles. Water cools the disc and washes away dangerous dust.

How to choose the thickness of cutting discs

Every craftsman knows that the thinner the tool, the better. less material is lost in chips, it is easier to cut, and the cut is cleaner.

115 mm and 125 mm saw blades are available in thickness of 1.0 to 2.5 mm. Blades 150 and 200 mm thick. thickness 1,8-4,0 mm. Pressed corundum powder reinforced with synthetic mesh.

Attention! The thinnest disc (1.0 mm) causes the disc to “walk” when sawing and break easily, its pieces fly in all directions at high speed. Do not forget about eye and hand protection.

The recommended thickness of the cutting disc is 1.6 mm.

Sanding discs

The next most important work that craftsmen assign to an angle grinder is grinding and polishing. The same treatment is applied to metal, wood, plastic and other materials.

Flap disc for wood: Dozens of sanding blades quickly cut shavings

The selection of sanding discs is very wide. If you are restoring a cupboard, the paddle wheel is the best choice for removing shellac layers. It grips large surfaces and cuts a lot of material in one go.

The sanding head is a plastic disc which Velcro fastens the sandpaper to

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Another grinding head is screwed onto the spindle of the angle grinder. Velcro is used to attach the sandpaper. For roughing P60 or P80, for finer work P120 or P180. With decreasing grit size, grinding turns smoothly into polishing.

Polishing disc made of alpaca wool

Pads, felt or cloth disks are available especially for polishing. Before sharpening, apply polishing paste, for example, GOI.

Sharpening wheels

Actually, for sharpening tools there are special machines. sharpeners. Nevertheless, the rotating disc of an angle grinder can correct a blunt axe or cleaver, knife or scythe. Considering the wishes of craftsmen, the industry produces sharpening discs 115 and 125 mm for bolsters.

Sharpening discs turn an angle grinder into a sharpener

The discs are made of coarse abrasive compressed into a thick plate (over 5 mm) with a bulge in the center. If you install such a disc on the spindle, the flange is hidden in the recess and does not protrude above the plane of the disc. Rough grinding discs are also used for cleaning of welding seams.

Deburring brushes and discs

Craftsmen repairing mid-century homes are faced with removing oil-based paint from walls. Wire brushes are good for this job.

No paint can resist such a steel cup

The socket is a cup with steel or brass wire strands around the circumference. They differ in wire thickness and hardness. for rough or fine grinding. The brush is screwed onto the spindle with an M14 thread.

The stone grinding disc slices off old cement evenly

After you remove the oil paint, you need to sand the curved concrete wall. Only an angle grinder can accomplish this task. The working surface of a diamond skinning disc is perpendicular to the axis of rotation. Synthetic diamonds cut and smooth concrete like sandpaper on wood.

How to change a disc on an angle grinder without a wrench?

Use a gas wrench. Use a pipe wrench to grasp the nut and carefully unscrew it without using much force. The drawback: it is possible to crush the nut, break the rotation lock.

Make a homemade wrench for an angle grinder. A long nail (at least 100 mm) is needed for this. You need to saw off the head, the tip and give the nail a U-shape. Bend it so that the “tool” legs fall into the flange holes. If the nut is screwed tight, between the nail posts insert any metal bar and, taking hold of it with both hands, rotate the construction in the direction of movement of the disk. At this time press and hold the spindle lock button. The method is safe, but requires time and additional tools. a hacksaw, vice, hammer.

Knocking with a chisel. Before changing the disk, you may spray the spindle shaft with WD-40 fluid and wait at least 15 minutes. Then put the tip of a thin chisel at an angle to the flange nut hole and gently tap the entire surface of the hole with a locksmith’s hammer. Sooner or later, thanks to gentle tapping, the nut will be dislodged, and it can be unscrewed by hand. The disadvantage of this method is that you can damage the holes and ruin the flange.

Heat the nut. If it is difficult to unscrew the nut of the angle grinder by hand, you can heat it a little with a gas burner or autogenous. Wear gloves when unscrewing the flange to avoid burns. This is the most risky of these methods. Bearings and oil in the angle grinder gearbox can overheat.

Finally we would like to mention a few important points concerning the replacement of the disc on the angle grinder.

  • Use suitable sized discs on the angle grinder. It is necessary to strictly observe safety precautions and in any case do not remove the protective cover to put a disc with a larger diameter. When choosing a disk, you need to consider the model of the power tool, its power, the spindle speed.
  • the blade rotating at high speed causes the angle grinder’s guard to be adhered to. So when changing the disk remove and clean the guard.
  • In some models of lathes there are washers to prevent the disk from getting jammed between the flanges. At least the supporting flange can be equipped with a rubber washer. Instead of factory fasteners, you can cut spacers from cardboard, rubber or plastic. You must use 2 spacers: between the supporting flange and the disk, between the disk and the nut.
  • Do not forget: if the disc is turned clockwise, the nut is also unscrewed clockwise and screwed counterclockwise.
  • If you do not want to buy a new wrench, install a Bosch quick-action nut on the angle grinder. it can be easily unscrewed by hand.

The main thing when changing the disc on the angle grinder does not violate safety precautions, and all manipulations perform with the tool unplugged from the network.

Which side of the disc should be mounted on the angle grinder?

Which way you put the cutting wheel may depend on several factors. Firstly, if the disk is not flat you can put it only one way and the question disappears by itself. Secondly, if the disc is still flat, you can be guided by the label. if the angle grinder turns from itself, then it is set with the label inside, if on itself, then, respectively, outside. If this principle is not followed, you can expect undesirable results. disk breakage during sawing or just a rapid wear of the disk.

How I change angle grinder wheels with or without a key plus safety tips

As for the direction of rotation of the disk on the angle grinder, it is primarily a safety issue. It is believed that concrete should be cut in the direction of rotation of the disk or on itself. Ideally, sparks should fly to the side to the left of the person working with the tool. If it is not possible to do this, it is possible to use another position, when a shear of sparks is directed downwards. In any case, you can not allow a situation where sparks fly away from the user, because in the case of a sharp jamming of the disc, the angle grinder will be directed in its direction.

In other words, to cut materials against the direction of rotation of the disc or away from yourself is extremely unsafe, because in the case of a wedge, there is a sharp ejection of the angular grinding machine in the direction of the one who works. By the way, if you have any additional questions about how to install the disk on the angle grinder, you can also view training videos, which are now more than enough on the Internet.

If you still have questions or need advice on changing and installing discs, just leave an application online or call the contact number listed and our experts will tell you how to act correctly. Our complete range of diamond discs is available in the diamond discs section.

Types of angle grinder discs

angle grinder is widely used in construction and repair technological operations. Discs for the angle grinder are different from each other:

Selection of discs for angle grinder requires knowledge and consideration of not only the machined workpieces, but also the capabilities of the tool itself.

Cutting discs

The most commonly used discs for angle grinders are also called abrasive discs. They are classified in different ways. There are discs for working with metal, stone, wood. There is also a diamond disc, which serves to work with the toughest and hardest materials (reinforced concrete, ceramic granite, tile, marble, granite and other natural and artificial stones).

Let’s give a brief characteristic of each type.

The general feature for all cutting discs is classification by outer diameter and thickness. There is an outer diameter:

  • 115 mm for small domestic grinders;
  • 125 and 150 mm for medium power and weight angle grinder;
  • 180 and 230 mm for powerful professional tools.

Disc thickness varies from 1 to 3.2 mm. It depends on the size of the nozzle: discs with a large diameter have a large thickness; medium and small discs have any. The choice of disc thickness is influenced by:

EASY, FAST, SIMPLE Replace a Cutting Wheel on Angle Grinder With NO TOOL

Metal cutting (abrasive) discs

These discs are used for sheet steel (disc thickness from 1 to 1.6 mm) and long steel products: rebar, round bars, channels, angles and others (disc thickness from 2.5 to 3.6 mm). There are special bits for working with stainless steel, aluminum, cast iron and other metals.

This information is indicated on the disc surface by markings and colored strips. Abrasive discs are several layers of fiberglass mesh, on which under great pressure on both sides pressed bakelite abrasive material (silicon carbide, corundum, electrocorundum). The reinforced discs are then heat treated in the furnace to obtain their strength. Set temperature of heating. 200 degrees. There the mass is sintered and becomes strong and resistant to shattering.

Abrasive stone discs

They are absolutely identical to metal discs and differ only in the abrasives used.

For wood

They are made of high-strength steel and have sharp teeth on the outer diameter. These tools work like a circular saw and are quite dangerous in operation. It is recommended to permanently secure angle grinder with a special attachment.


They are used for cutting high-strength materials of natural and artificial stone.

There are different kinds of diamond discs for concrete, reinforced concrete, stone. They are distinguished from each other by the diamond cutting size and type of cutting edge, either straight, or with large or small slots or notches. It is important to know that diamond discs are not used for working with metal workpieces. It is difficult to understand the purpose of diamond discs by their appearance. It is best to ask a sales clerk or consult the package insert before buying.

Some manufacturers of diamond discs paint the front side with paint depending on the material for which they are designed:

  • green. for granite;
  • yellow. for plaster and tile;
  • Blue is for marble and concrete;
  • gray. for granite ceramics and tiles;
  • orange. for brick.

Diamond discs with segmented cutting blade are used for dry cutting of stones. Discs with a solid cutting edge require water cooling. Turbodiscs with slots in the wheel body operate at higher rotational speeds than discs with segmented blades.

Sanding and roughing

Grinding wheels are divided into four types:

    Petal (sanding) discs remove old paint, primer or varnish, sand woodwork.

  • Special wire discs eliminate rust and remove persistent dirt.
  • Bowl-shaped diamond modifications are used to polish stone workpieces.
  • Discs of plastic or rubber are used to polish metal surfaces. Replaceable discs with sandpaper, felt, sponge, cloth can be attached to the discs.

Most grinding discs work with special pastes or fluids that include the finest abrasives. These nozzles polish the surfaces of any material, including car body parts in car repair shops.

The metal washer (ring) is designed to protect the integrity of the disk when it is tightened by the moving flange nut, as well as to increase the area of the bearing surface. In addition, the metal washer prevents the cutting wheel from “sticking” to the surface of the nut, which greatly facilitates the process of its replacement.

The cutting discs have no programmed direction of rotation. Therefore, it does not matter which side their installation will be carried out. But as mentioned above, the installation of the disk face outward, facilitates the process of its replacement (on the abrasive side unscrewing the nut is much harder). This setup is also of benefit in several other ways.

Ensures smooth installation on the shaft

The metal ring increases the contact area. So when the disc is mounted on the shaft and the nut starts to tighten, the pressure is evenly distributed. It ensures that the cutting wheel is positioned evenly and reduces the risk of damage due to torsion.

Easy to install the disc

You can always visually see which metal or stone grinder is mounted on the angle grinder when the grinding wheel is facing outward. They are not interchangeable and serious consequences are likely if mistaken. For example, if you try to use a metal cutting disc to cut through concrete, it can be destroyed and injure the craftsman with the resulting pieces. Installing the abrasive wheel with the label facing outwards is therefore not only comfortable, but also safe to work with.

Prescription instructions

The instructions for many angle grinders, such as the Metabo WP 850, clearly state that “the metal flange of the abrasive cut-off wheels must be against the supporting flange”. Manufacturers do not give such recommendations for nothing, as they ensure safe work with the tool, reduce the risk of serious injury to the master.


All budget angle grinders are usually equipped with so-called classic nut. It consists of a clamping and rotating part. Mounted on the tool and screwed with a special pin wrench. It is usually included with the angle grinder. This wrench is a must-have at all times! For a reason, many craftsmen even tape it to the wire of the angle grinder. There is no other way to remove the disc. Almost all clamping nuts have the same diameter and spacing of holes for wrench pins.

Pros: affordable, versatile, interchangeable, low profile for grinding work.

Cons: requires the use of a wrench, difficult to unscrew if jammed.

What to do if the angle grinder jammed (bogged) disc?

Everyone who has experience in intensive work with angle grinder probably at least once, but faced with this situation.

Usually, this happens if the disc is jammed between the parts, it stops or breaks, and the motor of the angle grinder continues to rotate and thus tightens the nut irreversibly.

So what can you do if the disc on the angle grinder is jammed?

Every craftsman has his own secrets.Especially for you, we have learned a few of them and now we will share the most common ways out.

Remove the disk from the angle grinder

First, find out which way to unscrew the nut.

The flange should always be turned in the direction that the disk rotates.

For this kind of work you will need either two gas wrenches or two clamps.

Here’s what to do: destroy the remains of the disk, use one wrench to fix the washer behind the disk, unscrew the flange with the other.

Remove the disk from the angle grinder

This method involves using the famous grease VD-40.

It’s probably like duct tape, you can use it for everything.

You need to spray the flange, wait about 5 minutes and try to unscrew it with a wrench.

Remove the disk with an angle grinder

This method is used in extreme cases.

When no other methods help, you can try to saw the flange with a tool like a hacksaw for metal, and then buy a new one in a specialized store.

Remove the disk from the angle grinder

How to change the disk on the angle grinder to avoid disassembly of the tool and intensive impact on it? For this purpose we crumble a disk as far as possible, we dismantle a protective cover of the angle grinder and we remove the rests of a circle with a hacksaw.

In carrying out all the above-mentioned manipulations, do not forget about safety precautions.

Take care of yourself and your tool.

Take it as a rule that the replacement of cutting and grinding discs on the angle grinder is carried out with work gloves, and the work itself must be necessarily carried out with special safety glasses.

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