What is the inside diameter of an angle grinder?. Disc diameter

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

The real owner for home and work needs must have an angle grinder. But without the right circles it is not always possible to achieve the desired result. Therefore, special attention is paid to their selection.

Initially, the purpose of the tool extended only to the cutting of internal 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 has become the cutting of metal and stone.

Types of discs for angle grinder

Wheels for the angle grinder are replaceable elements. When working with different materials, it is necessary to understand their types. This will help to perform qualitatively the necessary operation. The circles are classified according to the following parameters:

  • by designation;
  • type of work performed;
  • the constructive performance;
  • type of cutting;
  • material of manufacture;
  • size.

your hand-held tool is designed for use with metal, wood, stone, concrete, marble, etc. д. Manufacturers indicate the purpose in the marking, which is applied directly to the product itself. Many varieties are universal tools, suitable for processing several types of materials.

According to the type of work performed, which is specified in the name, manufacturers produce the following attachments to the angle grinder:

  • Stripping (metal brushes, flap discs, mandrel discs, packet discs);
  • Roughing (grinding circles, twisted scrapers, diamond roughing);
  • saws. The presence of teeth on the cutting edge is a feature of product design. It allows you to get a very clean cut on wood, drywall, gas silicate, plywood and other similar materials;
  • cut-off wheels. Cutting and diamond discs are available with a solid cutting edge and divided into segments;
  • Grinding (discs of different grit and hardness);
  • polishing (nozzles felt, felt, with special Velcro and sanding);
  • for cutting joints in asphalt, concrete, etc. д.;
  • Milling (for grooving, bowl cutting, edge grinding, etc.). д.);
  • sharpening. Characteristic feature. ability to perform operations on the side.

Wheel is an article of a certain diameter and thickness, having a mounting hole for attachment to an angle grinder with a solid, segmented or shaped cutting edge. The choice of the specific type depends on the operation to be performed and the material to be used. Cutting with such nozzles can be performed dry, wet and combined. The marking indicates this feature.

According to the manufacturing material discs are abrasive, hard-alloy, diamond and brush discs. The base of the first type of wheels is a special latex paper or fiber on which an abrasive layer with a bonding substance is applied. The fiberglass nozzle comes with a rubber or plastic backing pad. Carbide disc. a product made of alloyed steel. Such consumables can be used for cutting aluminum, stainless steel, high-carbon steel and other materials, as indicated by the labeling.

Diamond discs are universal consumables. Is a steel product with a diamond coating on its surface. It makes it possible to obtain the finest cut in any material. Popular products, popularly called turtles. a kind of nozzle, made on a flexible basis, has a corrugated structure and is attached by Velcro. Diamond discs are also available as solid-edged for wet cutting, segmented and turbo-segmented for dry cutting and combined discs.


Cutting with abrasive cut-off machines is associated with high cutting speeds and requires compliance with safety precautions. Before you start, familiarize yourself with the safety precautions specified by the manufacturer.

  • Minors, people under the influence of alcohol are not allowed to work with cutting tools. Keep children and animals away from work area.
  • Always work away from combustible materials.
  • Use cutting wheels only for their intended purpose.
  • Inspect the disc before you start the operation, do not use consumables with signs of damage (chips, cracks).
  • Do not use discs with expired shelf life.
  • Observe the rules for storing consumable tools.
  • Wear personal protective equipment when operating power tools.

Read also: Hand-made drill sharpening machine

How to use:

  • Properly secure wheel in power tool before beginning cutting work.
  • Use a power tool with a protective cover that can withstand impact if the cutting wheel breaks and collect the shards.
  • When cutting metal, fix the metal structure only on one side, this will help to avoid excessive heat and deformation of the material, and, consequently, jamming of the abrasive disk.
  • Hold the wheel straight with only radial pressure when cutting.
  • If you notice a strong spark, stop sawing for 10 to 15 seconds, after this time continue cutting at slower cutting speeds.

Install the cutting wheel in the angle grinder:

  • Disconnect the power tool from the mains.
  • Use the special button to lock the rotating shaft.
  • Fit the disc in its seating.
  • Tighten jam nut and secure with a wrench.
  • Check that the disc is in good condition for 1 minute before starting cutting.

Features of aluminum cutting discs

Due to their toughness, non-ferrous metals are difficult to cut with discs designed for steel and cast iron. The reason is that chips are not withdrawn from the cutting zone during operation, but block (contaminate) the space between the abrasive grains and the filler. Therefore, special discs with a softer and more prone to splintering are used for cutting pure aluminium and its alloys. With this component configuration, the cutting edge is better self-sharpening, although it does increase the rate of tool wear.

Only a limited number of manufacturers are producing special blades for aluminium, whilst others tend to quote a broader purpose such as “non-ferrous” in the material type. In general, cutting aluminum with an angle grinder only makes sense for occasional jobs. And for large quantities of aluminium workpieces cutting and nesting machines with special aluminum saw blades are much better suited. Picture below: Metabo diamond wheel for aluminum. Note the hardness grade (O stands for medium hard) and compare it to the Luzha blade.

Diameter of cutting wheel

This parameter is one of the most important when choosing an angle grinder for home or work. Accessories for angle grinders have different diameters. to decide which one to take, you need to take into account the type of work and duration of use of the tool, as the size of the disk affects the performance capabilities of the angle grinder.

diameter, angle, grinder, disc

Diameter of the cutting wheel affects the depth of cut of the material, that is, the maximum thickness of the pipe or workpiece that the grinder can cut in one pass, without shifting and not turning them. It is worth specifying that the width of the tooling does not correspond to the width of the product. it should be larger. So, an angle grinder with a wheel diameter of 125 mm can cut to a depth of no more than 30 mm. Such grinder is usually taken for home repairs.

100 mm. for light domestic work. fit on cordless grinders.

115 mm. used for very light work: cutting small items of thin metal and grinding surfaces.

125 mm. a good choice angle grinder with 125 mm disc for home and semi-professional works because of its versatility: suitable for cutting, grinding, deburring and other works. Good power and compact size at the same time. There are a huge number of consumables for this particular variant.

150 mm. intermediate between 125 and 180 mm. They are not very popular, as they have almost the same cutting depth as the previous type, and have the same weight and dimensions as powerful angle grinders with disc diameter of 180 mm.

180 mm. suitable for professional works thanks to good power and deep cut. The main function. cutting various products and structures made of metal at different angles. It is more difficult to grind or rough surfaces with such tools because of their heavy weight.

230 mm. these discs are used for fully professional tools that can cut various kinds of metals, stone and marble, brick and similar materials.

Cutting discs are most often used when working with an angle grinder. Distinguish between the following attachments according to their purpose:

  • For metal. Such cutting-off wheels are made of aluminium oxide or crystalline corundum. A bakelite bond is often used inside the product. Depending on thickness and size, the disc can cut metal profiles, stainless steel, heating pipes, etc.д. GRAFF GADM 115 10 is one of the inexpensive metal discs.
  • For stone and concrete. Circles for cutting stone and concrete are made of silicon carbide. Note that the disc is designed for relatively “non-hard” materials such as white brick and slate (harder materials will require a diamond wheel).
  • For ceramic tiles and concrete. This head is designed for cutting paving stone, ceramic tiles, red bricks, cutting bevel strips, etc.д. The disk itself is made of metal with diamond chips on the cutting edge. Solid discs and segmented discs are available. The former are designed for wet cutting (water cooling) because they get very hot in the process. Segmented, on the other hand, are convenient for dry cutting, and they are the most popular among diamond discs. Here, for example, is a quality durable segmented disk Makita B-28086 for cutting concrete and stone products.
  • For wood. Woodworking discs come in tungsten carbide carbide or metal with an abrasive coating. The former are designed for cutting hard and soft wood, drywall, gas silicate and fiberboard. The latter can also cut metal and even wood with nails (but this must be checked by experience). Zubr Professional 36859-125 is just such a representative of the “nail saw”.
  • Universal. These nozzles can cut almost all types of materials (for wood it is better to take a straight nozzle). In particular, they are convenient to use when you have to cut different materials in one working day and don’t want to waste time on a nozzle change. Universal models even cut reinforced concrete. However they are often quite expensive and sometimes it is more profitable to buy two discs for different types of materials. From good universal wheels we can recommend Wolverine 100125, which is suitable for both wet and dry cutting.

Popular models rating (table)

  • Speed adjustment
  • Soft start
  • Maintaining speed under load
  • Handle can be set in three positions
  • Case included
  • Speed adjustment
  • Soft start
  • Protection against unintentional start
  • Speed control
  • Soft start
  • RPM control under load
  • Speed adjustment
  • Soft starter
  • Speed adjustment
  • Soft start

Photo gallery: rated models

Sparky M 850E

Energomash angle grinder-9512P

diameter, angle, grinder, disc

Makita 9069

Bosch GWS 850

Safest angle grinder blade for wood GRAFF SpeedCutter


DeWALT D 28136

Interskol angle grinder-125

diameter, angle, grinder, disc


Makita 9555 HN

Metabo W 2000

What is the inside diameter of an angle grinder?

Home Articles Cutting discs for angle grinders

In this article we will talk about cutting discs for angle grinders. And just about circles for cutting metal.

Almost all discs for angle grinders have the same seating hole (inside diameter) of 22.2 mm. or 7/8. There are cutting-off wheels with seating dimensions of 25,4 mm and 32 mm (outside diameters of such discs ranging from 300 to 500 mm), but they are designed for mechanisms that are already difficult to call a hand tool. These are machine tools.

Inconsistency in the size of the seats first of all signals that the cutting wheel is designed for a different tool.

There is an exception to the “22.2 mm” rule. There are angle grinder with a seating size of 16 mm. Completely uncommon. fit diameter of 10 mm. These are very small circles. Outer size of the baby.58 mm. and the speed can be over 20,000 rpm.

99% of parting-off wheels will have one of these outside diameters: 115, 125, 150, 180, 200 or 230 mm. rarity.100 mm and less (most likely to be found as consumables for pneumatic angle grinders).

Disc thickness varies from 0.75 up to 3 mm. Standard versions: 0.8, 1.0, 1.2, 1.6, 2.0, 2.5, 3.0 mm.

Cutting discs 300, 335, 350, 400, 500 mm in diameter are not suitable for manual angle grinders.

Sometimes the marking of cutting wheels may say “For metal”, for cutting metal. This information is incomplete.

  • Steel. for steel
  • Cast iron. for cast iron and castings. Natural stone and brick may be cut with these discs.
  • Inox. for stainless steel
  • Aluminium. For aluminum, but also suitable for most non-ferrous metals.

There is no uniform color coding for the purpose of the cutting disc. The most common color for steel circles is blue, while black is for stainless steel. The German manufacturers have the opposite. Black for steel, blue for alloyed metal. Cast iron. red in both cases. Wheels for aluminium can be silver or black.

The combination of two colors indicates suitability for use with two types of material.

There are two options for cutting wheels. First. the seat is in one plane with the entire wheel, Second. the seat plane is shifted a few millimeters from the cutting plane Price is the same, but the functionality of the wheel can be different.

An important and significant indicator is the angular velocity at which the cutting disc can be used. There are two parameters that are actually the same.

The first. the maximum angular velocity, the second. the number of disk revolutions per minute. The values of angular velocity are usually standard and are taken as 63, 80, and 100 m per second. Color coding in this case: green = 100 m/s, red = 80, yellow = 63. Rarely found, but there are discs with angular speeds of 20, 25,32, 40 and 50. Number of revolutions is actually a recalculation of angular velocity into other units. It is clear that as the wheel is worn down, the angular velocity of the working edge decreases and the number of revolutions remains constant. RPM 6600 means that the maximum RPM should not exceed 6600 rpm. in minutes.

The metal ring of the inner diameter usually shows the expiration date. A four-digit number indicates a year, and the parameter with the Latin letter V indicates a quarter. V1 is first, V4 is second, V7 is third, V10 is fourth. This is not a manufacturing date. This is the expiration date.

Grinding wheel grit is a parameter given after the letter F. Possible variations are from 16 to 220. A smaller number corresponds to a larger grain size.

The hardness of the blade is essential for working materials of different viscosities. Identified by Latin letters A through Z. The furthest letter position in the Latin alphabet corresponds to the hardness.

Abrasive grit can be of different materials. International standard designation:

Combinations of these materials are possible.

The type of binding agent may vary, but on angle grinders wheels are usually bakelite with glass mesh reinforcement. Latin designation BF, the Russian equivalent is BU (Bakelite hardened).

DIY. How To Remove A Stuck Angle Grinder Blade / Disc / Wheel By Force. Tool Life Hack =]

Non-woven, single-ply and mesh-reinforced grinding wheels can be found, but are not suitable for angle grinders. There must be at least 2 layers of reinforcement.

It is strictly forbidden to use cutting-off wheels with a diameter greater than the dimensions specified in the data sheet of the angle grinder.

In terms of maximum RPM, the cutting wheel must comply with the data sheet of the angle grinder.

The usual safety equipment is specified on the cutting wheel pictograms, but the most important is safety glasses or face shield.

The only reason why I needed to mention safety in the operation of an angle grinder was. It really is the most serious tool in terms of safety and it really is a rare case when you should follow all the instructions in the manual.

Perhaps a completely dumb and helpful instruction. angle grinder cuts soft tissue and bone forever.


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”. You could break the spindle lock or damage the gearbox if you are not careful.

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

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

Goggles are necessary not only as a safety element. If your eyes are protected, you can pay more attention to the actual work of the “angle grinder“, to ensure proper cutting or selection of the correct mode of operation. This will allow the most efficient use of consumables (cutting discs), minimize the emergence of abnormal situations with jamming of the disc or its destruction.

A protective mask that completely covers the face. this is especially important for a craftsman with impaired vision, who wears dioptric glasses, on which protective goggles cannot be put on.

Disc on the “angle grinder” can be installed as a “from itself” and “on itself” depending on the direction of rotation and, consequently, the flow of chips. It does not make any fundamental difference in operation. However, an “angle grinder” with a “on itself” wheel tends to jump out of the cut forwards rather than towards the person using it when the wheel jams. This is especially important with powerful tools, but even a small angle grinder can be a serious hazard.

A specially installed extension cord with a plug socket, preferably without grounding, can help you quickly stop a machine that has escaped from your hands.

“The angle grinder is a coarse tool and you should not strive to get a perfect surface as a result of its work, the main thing is to make a rough cut, which later, if necessary, can be processed in other ways.

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 practically have 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. Cutting quality and safety depend on cutting pressure.