Wrench for angle grinder not to lose. How to change the disk with a wrench for angle grinder and without it? An easy way to unscrew the nut of an angle grinder angle grinder

The angle grinder is a universal power tool. It can be used to cut steel and wood, process concrete and stone, grind and deburr, and sharpen hacksaws. And there is a specific wheel for each operation. For example, a fine cutting wheel for angle grinder should not be used for grinding surfaces. it will break quickly. How to correctly place the disk on the angle grinder when grinding and breaking the wheel or switching to another type of work?

According to the operating instructions, the disc on the angle grinder must be replaced as follows.

  • Unplug the power tool from the socket.
  • Press the spindle stop button.
  • Holding the angle grinder stop button, use an open-end wrench to unscrew the flange nut. Turn the angle grinder wrench in the direction of rotation of the disc. If it is difficult to press the button with one hand and operate the wrench with the other, ask someone close to you to help.
  • Remove the old disc from the spindle shaft.
  • Install a new disc.
  • Secure it with the nut by hand or with the same Allen wrench. At this point, hold the stopper with your other hand. Do not tighten the nut too much.
  • Unplug the angle grinder for about 30 seconds at maximum speed. If the disk rotates freely, without striking the guard, you can get down to work.

change, disk, angle, grinder

The angle grinder must be supplied with an open-end wrench. Cheap angle grinders often come with a poor quality wrench. It can quickly break (by the way, this also happens with tools from leading manufacturers). In the end, you can simply lose the wrench. How to properly install the disk on the angle grinder in this case, not having at hand a suitable tool?

The most reliable way. just buy a new wrench. You can take the standard, under a certain flange for the angle grinder, or sliding, with the ability to adjust the jaws. But not all pipe wrenches are available at all construction stores, and it can be difficult to find the right tool. Here are a few tricks with which you can change the disk on the angle grinder without a universal wrench, and save your nerves and money.

How to change the disc on the angle grinder without the key?

Use a gas wrench. Use a pipe wrench to grasp the nut and gently unscrew it without using too much force. Disadvantage: you can crush the nut, break the rotation lock.

Make a self-made wrench for the angle grinder. You will need a long nail (at least 100 mm). You need to saw off the head, the tip and give the nail a U-shaped. Bend it so that the “tool” posts get into the holes of the flange. If the nut is screwed tight, between the posts of the nail insert any metal bar and, taking hold of it with both hands, rotate the construction in the direction of the circle. Press and hold the spindle locking button at this time. The method is safe, but requires time and additional tools. a hacksaw, vice, hammer.

Tapping with a chisel. Before changing the disk, you can treat the spindle shaft with WD-40 fluid and wait at least 15 minutes. Then place 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 light knocking, the nut will unscrew, and it can be unscrewed manually. The disadvantage of this method is that you can damage the holes and ruin the flange.

Heat up the nut. If it is difficult to unscrew the nut of the angle grinder with your hands, you can heat it a little with a gas burner or an autogen. Wear gloves when unscrewing the flange so as not to burn yourself. This is the most risky of the methods. The bearings and oil in the gearbox of the angle grinder can overheat.

Finally I’d like to mention a few important points concerning disc replacement on the angle grinder.

  • On the angle grinder you need to install the right size wheels. It is necessary to strictly observe safety precautions and never remove the protective cover in order to put a disc with a larger diameter. When choosing a disk, you need to consider the model of the power tool, its power, spindle speed.
  • Because of the disc, rotating at high speed, on the protective cover of the angle grinder formed chips. Therefore, always remove and clean the guard when changing the disc.
  • Some angle grinders are equipped with washers to prevent the disc from jamming between the flanges. At least the supporting flange can be equipped with a rubber washer. Instead of factory fasteners, you can cut the gaskets from cardboard, rubber or plastic. Two washers should be used: one between the support flange and the disk and the other between the disk and the nut.
  • Do not forget: if the wheel is turned clockwise, the nut is also unscrewed clockwise and tightened counterclockwise.
  • If you don’t 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 rules and all manipulations should be performed with the tool disconnected from the mains.

How to remove without a wrench?

Disc angle grinder, judging by numerous reviews, can be dismantled by using a large pipe wrench, which is often called a gas wrench. The first thing the wizard needs to do is to spread it far enough so that it can completely encircle the flange. Hold the spindle with a metal object while turning the open-end wrench and squeezing the flange. According to the reviews of home craftsmen, this method is considered very effective. If it does not help, then the nut specialists advise to “knock out” a metal rod or a thin chisel. The spindle is also secured. The nut will move out of position by tapping lightly on the flange at the edge. The tapping should be done in the direction in which the disk is turning. According to the experienced masters, this method can not be called safe. The thing is that you can damage the flange, namely the holes into which the pins of the wrench.

It will not be difficult to remove a damaged disc with a wrench made of a nail. According to experts, its optimal size is not less than 100 mm. First, the nail must be bent into a U-shape. It is important that the distance between its ends corresponds to the two holes in the flange. Then, with a sotka hacksaw you must carefully cut the nail head and nail point. Now the homemade wrench can be inserted into the flange, fix the spindle and unscrew the mount. If it just so happens that the nut is tightened too much, a bigger lever is needed. Insert another “honeycomb” between the two vertical ends.

Techniques for loosening if the disk is jammed

What to do if the clamping flange seizes up? This nuisance, when the nut is jammed, often occurs if the tool is jammed in the workpiece when working with thick and tough materials. In doing so, the abrasive wheel will often break and the spindle will continue to rotate and tighten the clamping flange. There are several ways to release the angle grinder if the disc jams.

Use a torque wrench

This method is not quite safe, because you can break the lock, although in most cases, it is possible to unscrew the nut. To avoid breaking the spindle lock, do not use much force with the hexagon socket wrench. The locking device is designed to withstand the force of a standard spanner.

If the flange is jammed too tightly, it can be unscrewed with 2 gas wrenches. To do this, break off the protruding ends of the abrasive wheel with pliers so that you can reach the lower flange with the first gas wrench. Next, clamp both flanges with wrenches and turn them in opposite directions (taking into account whether the thread on the spindle is right or left).

Disassembling the gearbox

If the retainer is broken, you will have to disassemble the gearbox to remove the tool from the angle grinder. Use pliers to break off the edges of the remaining grinding wheel so you can get to the bolts that hold the gear cover in place. After that unscrew the fasteners and open the gearbox. The cover will be removed together with the gear shaft. Next this shaft should be clamped in a vice with aluminum spacers put between the steel jaws and unscrew the flange with a gas wrench (don’t forget to determine unscrewing direction).

Heating the nut

The nut can be heated with a gas torch, construction hair dryer or blowtorch. A heated flange can usually be unscrewed with a standard angle grinder wrench.

Grinding a jammed wheel

If after using the first 3 ways the nut is not unscrewed, the remaining abrasive wheel between the flanges can be ground. To do this, proceed as follows.

  • Use pliers to remove the rest of the wheel as much as possible from around the edge of the nut.
  • Clamp in a vice a piece of sheet iron the same thickness as the drive itself, turn on the angle grinder and grind the rest of the wheel on the face of the sheet iron.

A piece of abrasive wheel can be clamped in a vice instead of iron. Grinding of tool remnants between flanges is then faster and the nut can be unscrewed by hand.

But the use of a stationary abrasive wheel requires great care, because when grinding tool residue can damage the geometry of the flange. If this happens you will have to end the nut.

Using penetrating grease

Liberally pour WD-40 liquid on the junction of the flange and the shaft. It tends to penetrate into interthreaded spaces and small cracks. After the application wait for about 5 min and try to unscrew the fasteners with a standard wrench.

Using a torch

Some grinder owners, in a situation where the clamping nut is jammed, install a “chisel” or “jackhammer” attachment in the pedal, insert it into the flange hole at an angle and engage the jackhammer mode without rotation. The locking button should be pressed accordingly. You just need to press a couple of lightly with the torque wrench (in order not to break the shaft lock) and the nut will start to unscrew.

Cut the clamping flange with a hacksaw

This method can be called a radical method, because it is necessary to buy new fasteners, and it is applied if the nut can not be unscrewed by any other methods. To saw the flange, squeeze the stop button so the shaft does not rotate, and use a metal saw to cut the fastening nut.

Jammed nut. how to unscrew it?

It is not so easy to remove the disk on the angle grinder if it is jammed, especially without damaging the cutting element or the tool. There are also a few more ways to do this.

Replacing the disc with an opposite rotation

This method has several advantages. it can be carried out without a wrench and with a broken spindle lock. Those who are new to working with an angle grinder mistakenly believe that if the stopper is broken, unscrewing the nut is almost impossible. However, this is not the case. You don’t even need wrenches.

The point is that the grinding wheel needs to be rotated in different directions. Wearing tight gloves, you need to repeatedly hit the cutting edge of the wheel. That’s how you make sure you have variable motion in different directions. As a rule, a couple of sharp blows are enough to easily unscrew the nut.

Using an open-end wrench and a socket head

In this case you may need to use the standard tools available, a 17 mm open-end wrench and a 24 mm socket head. The thickness of the spanner is ground to 4 mm. There are 4 protrusions on the head that fit into the holes in the retainer nut.

After preparation, the wrench is placed in the space under the disk, and the head is put on the flange of the angle grinder and turned in the opposite direction to the rotation of the wheel. It can then be easily removed and replaced with a new one.


This is one way to remove the disc from an angle grinder without using a wrench. The fixing nut is heated with an industrial hair dryer or a gas torch. The flange can then be unscrewed much more easily. However, there is a risk of damaging the plastic parts of the angle grinder or the gearbox.

With a nail

A 100mm nail is best for this purpose. It should be bent into a U-shape so that the ends fit freely into the holes of the clamping flange. The point and nail head are removed. Insert the nail into the holes and unscrew the retainer. If your hands are not strong enough, add a nail or screwdriver in the form of a lever.

Using a gas wrench

The rationale for using this tool is to increase the applied torque with a larger lever arm. It is much easier to unscrew the jammed connection with a spark plug wrench. However, when tapping, it is important to remember that excessive force may damage the spindle lock or the jam nut.

Use a rotary or chisel drill

Unscrew the disk on the angle grinder without a wrench can be used with a drill or a rotary tool, pre-set it in the chipping hammer mode. A suitable auger is used as a working head, usually 6 millimeters. Position the drill against the edge of the hole in the clamping nut, secure the movement of the spindle and use a short torque to move the clamping nut out of position. This way even very complicated jams can be unscrewed.

Tapping out the nut

This method is similar to the previous one, but you can use a suitable metal rod or chisel. With the head of the spindle locked, tap the edges of the clamping holes in the direction of travel of the wheel. Slightly moving the retainer from the dead point, you can unscrew it by hand. However, this method is not the most harmless for the tool. the mounting holes for a standard spanner are damaged.

Cutting wheel breakage

It is possible to unscrew a jammed nut by completely destroying the disc. If there is already damage, you can break it off by hand, but more often than not you will not be able to do this. It is better to take a hacksaw or metal blade and saw. This will leave you with a center ring and hard to reach pieces. Having found a suitable plate, grind the rest of abrasive material against it until it reaches the metal ring in a vice. After that it can be easily unscrewed with a standard spanner.

The most radical way to unscrew a jammed jam nut is to saw it out. It is advisable to use it only in extreme cases. Of course, you can find a new one, but you have to spend your time and money. It is not uncommon to have spare clamping elements in the delivery set of the angle grinder.

With a hammering blowtorch

You have to put it into chiseling mode without rotation. Drill 6 mm should be placed on the edge of the flange or press it to the edge of the hole. The task is to unscrew the nut, to pull it out of place. After that, unscrew it by hand or with a wrench. During the work it is necessary to block the rotation of the spindle.

Before you unscrew the nut on the angle grinder, you will have to crush the disk completely. If it is already broken, you can break it off with your hands. Whole wheels can be cut with a hacksaw or metal blade. The abrasive wheel should leave an inner metal ring and pieces that cannot be mechanically manipulated. Then clamp in the vice a metal profile or any unnecessary plate with a thickness less than or equal to the thickness of the disc (but no more). Then turn on the angle grinder and grind the remnants of abrasive to the sleeve seat. After that the flange can be easily unscrewed with a universal wrench for angle grinder.

You can take care beforehand that the tool is not jammed in the angle grinder:

The clamping nut for angle grinders is included in the scope of delivery. And the most radical solution to free the jammed disc is to saw it and put a new one. You can find such fasteners in all power tool stores.

When working with an angle grinder or, as we used to call it, with an angle grinder, it happens that the nut fixing the disk is clamped. In most cases, this happens with abrasive metal cutting discs. This situation is familiar to many, and it is not a pleasant one. There can be several reasons for this, but the main one is the disc jamming as a result of improper operation of the device. If you are not yet familiar with the article “How to properly cut with an angle grinder,” I recommend that you read it by clicking here. In today’s article I will talk about how to quickly and easily unscrew the jammed nut on the angle grinder, without ruining the tool and your nerves.


If you had to use a gas wrench, you must remember about the very powerful arm of such a wrench and the force applied to the parts of the “angle grinder“. Ripping the spindle locking device or damaging the gearbox can occur if you are not careful.

All manipulation with the angle grinder’s disc must be performed with the power supply completely disconnected (the plug must be unplugged). Any unintentional pressing of the start button will cause the electric motor to start, and the plunger rotation speed is very high. Injuries in this case cannot be avoided.

Working with “angle grinder” involves a lot of waste in the form of metal or wood chips and dust. Before you begin, you must wear special protective glasses: they will protect your eyes from the splinters of the cutting wheel in the case of its jamming and destruction.

Glasses are necessary not only as an element of safety. If your eyes are protected, you can pay more attention directly to the work of the “angle grinder”, ensure proper cutting or selection of the correct mode of operation. It allows the most efficient use of consumables (cutting wheels), minimizes the occurrence of abnormal situations with a bitten disk or its destruction.

A mask that completely covers your face is an excellent substitute for glasses; it is especially important for a visually impaired craftsman who wears dioptric glasses which are not suitable for safety glasses.

The blade on the angle grinder can be mounted “on” or “off” depending on the direction of rotation and accordingly the chip flow. It makes no fundamental difference at work. 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 be a serious hazard as well.

A specially mounted extension cord with a plug socket, preferably without grounding, will help quickly stop the work of the machine that has torn out of hand.

Angle grinder”. a tool of rough treatment and strive to get a perfect surface as a result of its work is not worth it, the main thing is to make a rough cut, which later, if necessary, can be processed by other means.

To work without clamps and jamming it is better not to cut long metal workpieces to the end, leaving 1-2 mm of metal in the cut: they will be easy to break off afterwards, it will have almost no effect on the quality of the workpiece.

Small workpieces are best placed in a vise or clamped to a workbench or other reliable horizontal surface. Both the quality of the cut and the safety depend on the tightness of the pressure.

To change the disc on the angle grinder you need to unscrew the fixing washer.

The fixing washer is generally provided with special slots, and can only be unscrewed with a suitable spanner normally supplied with every angle grinder.

On some angle grinder as fasteners are installed usual nuts, which can be unscrewed with a wrench.

To unscrew the washer in its grooves need to install a wrench angle grinder.

On the other side of the angle grinder, press the locking button to lock the rotor in a stationary state.

Next you need to turn the wrench counterclockwise.

This is how to unscrew the fasteners, then replace the old disc with a new one.

After installing the new disc in place, first hand-tighten the securing washer, and then tighten it with a wrench.

Now the angle grinder is “charged” with a new disc and you can get to work.

What method of fastening to choose?

What kind of nut you need to mount your angle grinder disc? There is no definite answer. It all depends on the specifics of your work and the model of the tool. Experience will tell which is better. For example, for all the indisputable advantages of superlatives and quick-clamping elements, they have their detractors. They are not recognized by craftsmen who are used to working with a cutting wheel up to the stop. In that case, a nut with a larger diameter than the standard nut does not allow you to use the entire surface of the disk to the maximum. There can also be problems with fixing certain flap wheels. Users working with diamond discs do not install such fasteners because they are heavier than standard. this affects the balance when precisely cutting the stone.

Many people believe that the key and rotating washer nut are a thing of the past. But it is not so. Affordable items are not so sorry to break, lose or give the work to the crew. And those who want to buy a professional tool for themselves, of course, do not spare money and for such a little thing as a quick-clamp nut for fixing the disc of angle grinder. In our catalog you can find the appropriate type, price and purpose. come in and choose!

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