Metal Cutting Diamond Disc for Angle Grinder • CIMFLOK.COM (2023)

Diamond discs for an angle grinder: purpose, models, rules of use

  • Features and purpose
  • Advantages and disadvantages
  • Models and their characteristics
  • Selection Tips
  • How to use?

Diamond discs for angle grinder are highly efficient, strong and durable. On sale you can find various modifications that are used to solve various household and professional tasks..

Models and their characteristics

Diamond grinding bowls can be either 125 mm or 230 mm in diameter. In professional circles, they are also called “turtles”. Such a disc for processing concrete is sold with a special spraying, all models differ in shape and are designed to work in special conditions.

  • Segments in one row. Such a disk weighs a little, but demonstrates great performance. Of the shortcomings, the complexity of the work can be noted, since in order to hold such a nozzle, it will take a lot of effort from the user.
  • Segments arranged in two rows. It is used for roughing, since it quickly and effectively removes any irregularities not only from a concrete surface, but also from a stone one. With it, you will additionally need to use a nozzle for fine finishing..
  • Product of the “Square” type. Necessary for rough surface treatment, chipping effect can be observed, thanks to which the desired result can be quickly achieved. Such a nozzle wears out for a long time, after it there is a roughness on the surface.
  • Typhoon model. Essential for stripping off super-dense material. It is characterized by high strength and long service life. The shape has been specially thought out in such a way that the spent particles are quickly removed to the side and do not interfere.
  • Segmented Turbo. Has a solid diamond surface, thanks to which the grinding is carried out accurately. Such a disk is used when special care is required. Most often used to create marble and granite monuments, since corners can be easily worked, creating smooth mowing lines.
  • Boomerang nozzle. Fine finishing product with fine diamond inclusions. Treats the surface gently, is highly resistant during work.

Selection Tips

When a user has a need to purchase a universal diamond blade, there are many factors to consider..

  • Manufacturing material. The segment disc is used for processing dry concrete, which becomes the root cause of the rapid wear of the packing. That is why experts advise buying nozzles with the maximum thickness if it is new concrete, and of moderate thickness if it is old..

It also happens that sand is present in the mixture of material, then it is imperative that there should be a silver soldering on the surface of the cutting wheel, and the circle itself should be soft.

  • Particular attention to the cutting technology that will be used while working on concrete. Solid discs require a coolant supply, so the unit used must have such a function. Use only segmented product for dry cutting.
  • Most users are trying to save money, but it’s not always worth it. If you plan to solve everyday problems with the help of the tool, then the disc can also be purchased at a reduced price, but with the appropriate quality, since it will not be required to solve problems of increased complexity. The main thing is not to use it without stopping and avoid overloading, then the product may well cut concrete or reinforced concrete with an average degree of reinforcement. Professional circles are a completely different category that cannot be skimped on. Their overpriced is due to their reliability and durability..
  • The last thing that the user needs to take into account is the depth of cut, since the larger it is, the larger the diameter of the nozzle should be. In this case, most people forget about the capabilities of the tool used, since it should not make a large number of revolutions, leading to premature wear of the nozzle. On the other hand, if a disc with a small diameter is put on an angle grinder with a minimum number of revolutions, it will quickly heat up.

Features and purpose

A diamond disc is a circle made of a metal alloy, in the design of which diamond plates are installed on the edge. The following nozzle is used for work:

  • for metal;
  • by tile;
  • on porcelain stoneware;
  • for concrete;
  • stone;
  • on wood;
  • for metal tiles;
  • for glass cutting.

The scope of application of such attachments is very large, hence the demand for products that are manufactured in accordance with the task at hand. At the same time, they have the appropriate markings, by which it is possible to understand what exactly the circle is intended for. There are even models on sale that can cut glass. Glass cutting discs usually do not have a large diameter and coarse abrasive on the surface, which allows you to increase the accuracy and accuracy of cutting the material.

All diamond discs are made from industrial diamonds, which are pressed into the alloy during the production process.

The plate is attached using laser welding or soldering. The latter method involves the use of silver or a special powder. After that the disc is sharpened, and it is released for sale, ready for use..

Discs can vary in:

  • type of edge;
  • the composition of the binder;
  • the amount of abrasive per square centimeter;
  • indicators that diamonds have.

All diamond discs that are on the market for angle grinder attachments can be divided into two large groups:

  • for cutting material;
  • for grinding various surfaces.

Cut-off wheels also differ from each other primarily in the type of material relative to which they can be used. The determining factor when choosing attachments for angle grinders is their performance and service life. For example, the blades must cut material easily, providing high efficiency with minimal operator effort..

For cutting or grinding metal, discs are usually made of reinforced abrasive material..

Most of the modern models for natural stone processing are designed in accordance with the latest consumer requirements and the use of advanced technologies. For stone cutting, a diamond cutting disc is used. This rather expensive tool outperforms conventional abrasive discs – cutting is much cleaner and faster, and discs last much longer than abrasive discs. Ultimately, the diamond cutting disc is the best choice for working with stone. The diamond cutting disc should not be used to cut metal as it will be quickly destroyed.

Discs are available in the following sizes:

  • 4 ½ “- 115 mm;
  • 5 inches – 125 mm;
  • 6 inches – 150 mm;
  • 7 inches – 180 mm;
  • 9 inches – 230 mm.

Small discs can be used at higher speeds, large discs only at minimum rpm, while there is a relationship between the diameter and the number of revolutions per minute. The larger the disc, the lower the number of revolutions it should work. For example, a 115 mm accessory can be fitted to a tool that can rotate up to 11,000 revolutions, while a 230 mm accessory only fits 6,000 revolutions..

Cutting discs can also be classified as:

  • segment;
  • whole;
  • for reinforced concrete;
  • turbo segment.

The first ones on the list are suitable for dry cutting of concrete. Their peculiarity is that the diamond edge is set in a segmented manner. Since during operation such a nozzle heats up faster and stronger, the slots allow faster cooling of the disc..

Waste is removed through the slots that appear.

In contrast, solid discs have no gaps, but holes are provided in the design to reduce stress. Coolant is supplied during operation.

The segmented design is present on discs used for reinforced concrete, however, more diamonds are applied to the teeth, since more strength is required. Such nozzles have a greater thickness, however, it will not work to cut material with a thickness of more than 100 mm in one go..

Turbo-segmented have a wavy surface, due to which rapid cooling occurs. They cost much more, but the price is compensated by great opportunities..

The thickness of such a nozzle is clearly specified in GOST 10110-87, where it is indicated that the thickness of the diamond layer can be from 5 to 10 mm. The height of the nozzle body is from 0.15 to 2.4 mm. The size of the landing diameter can vary from 12 to 76 mm. The outer diameter should be from 5 to 50 cm.

Depending on the hardness of the bonding material used, this type of disc can be soft or hard. The former are used for processing concrete, because, despite their small resource, they cut the material much faster. Solid can be used when cutting on asphalt, marble, clinker.

Grinding models are used for processing concrete surfaces. In their design, diamond powder is fixed to the surface by means of a special binder, which can be:

  • organic;
  • metal;
  • ceramic.

The substance described is responsible for maintaining the diamond coating, which takes on the centrifugal force at the moment of rotation. Diffuse sintering is applied to bond the body and the diamond layer.

Advantages and disadvantages

Diamond discs for angle grinders have their advantages:

  • they can be used with almost any material;
  • any task is performed faster, better, without additional efforts from the operator;
  • if compared with abrasive wheels, then diamond wheels are safer, since no sparks arise at the time of operation;
  • when working with such a nozzle, the noise level is much lower;
  • precision is one of the main advantages of diamond discs, resulting in a high-quality cut.

Despite such a number of advantages, the attachments have their disadvantages. They cannot be used for processing metal, regardless of the alloy, however, as well as wood..

When working on concrete, a lot of dust can be generated, therefore work clothing, as well as eye and respiratory protection.

How to use?

There are a few key points to keep in mind when using an angle grinder, especially when using a diamond bit.

  • Before installing the cutting disc, you will need to inspect it for integrity, since it is forbidden to use circles with a defect. This also applies to the expiration date, which few amateurs know about..
  • The sharpening of the tool should be carried out exclusively with a specially designed nozzle and no other disc, since its edge is not designed for such a load and will simply fly apart during operation..
  • It is forbidden to put on the tool a cutting or grinding disc of the wrong diameter, as well as to use them for other purposes or in the processing of unsuitable material. Installing a nozzle with a larger diameter will require removing the protective cover, and this is strictly prohibited for safety reasons..

For information on how to choose a diamond blade for an angle grinder, see the following video.

Main advantages and disadvantages

Diamond cutting discs are versatile tools. They are suitable for cutting not only metal, but also from other materials of increased hardness: brick, reinforced concrete, foam concrete and others. The advantages of this tool include:

  • increased geometric accuracy of the cut;
  • flat surface;
  • almost silent operation.

Metal Cutting Diamond Disc for Angle Grinder • CIMFLOK.COM (1)

The diamond disc does not exert pressure on the structures adjacent to the cut surface, and does not change the structure of the material during operation. At the same time, much less time is spent on performing work than when using other tools. The diamond wheel works in the absence of a flow of sparks, and, as a result, there is no burning smell.

The cost of work using diamond discs should be calculated for each specific job.

The disadvantages of such a device can be attributed to the high cost, but the working life of the diamond cutting tool is much higher (almost 70 times) than the working life of abrasive discs that do the same job. Reduced equipment downtime by reducing tool change frequency. When using active cooling, it is possible to increase the rotation speed and productivity. Throughout its entire service life, the tool retains its geometric characteristics.

Rotational speed of the blade when cutting metal

Diamond attachments are used on an angle grinder that typically has a rotational speed of the working shaft up to 12,000 rpm. The maximum indicator that the discs can withstand without destruction is 13900 rpm..

Diamond blades for metal cutting

One of the technological operations of metalworking is cutting off a part from a whole. This procedure can be carried out on specialized equipment using various instruments. One of them is diamond cutting discs for metal.

Main characteristics and markings

One of the main characteristics of a diamond blade is its size – the outer diameter, on which the maximum cutting depth depends. For the universal grinder (angle grinder, angle grinder) there are sizes: 115, 125, 180 and 230 mm. Powerful metal cutting machines are equipped with attachments with a diameter of 150, 300 and more millimeters. The bore holes located in the center are used for installation on the mechanism shaft and have diameters of 22.2 or 25.4 mm. Like any product, a diamond cutting disc has a set of basic characteristics:

  • a type;
  • the size;
  • abrasive material from which it is made;
  • material for the processing of which it is intended;
  • grain;
  • hardness;
  • bundle type;
  • maximum number of revolutions;
  • accuracy class;
  • manufacturer.

These characteristics are encrypted in the form of alphanumeric markings, which are present on each diamond disc. The labeling rules are not strictly regulated. Each manufacturer designs it in its own way, but the main characteristics are always present.

  • Disc type. In theory, there should be a digital designation:
  • straight profile;
  • detachable;
  • recessed center.
  • Disk dimensions. On the manufacturer’s website it is stated as follows:
  • D is the outer diameter;
  • T is the height;
  • H – hole diameter.
  • The material for which the disc is intended to be processed. It is indicated by an inscription on a circle (metal or steel – for metal processing, concrete – for working with concrete), a colored mark (blue – steel, green – concrete).
  • Abrasive material from which the plate is made.
  • Grain. Sizes of abrasive particles. This parameter is indicated on the circle in conventional units and indicates the fraction of abrasive based on international marking standards.
  • Hardness.
  • Bundle type. Bakelite, ceramics or synthetic rubber are used as a binder:
  • ceramic bond – V (K – old designation);
  • bakelite bond – B (B – old designation);
  • volcanic bond – R (B – old designation).
  • The maximum number of revolutions at which the disc can be used. Range varies from 6,600 to 13,300 rpm.
  • Accuracy class: АА, А and B. АА – high accuracy of geometric parameters. A is an intermediate option. B – for less critical operations.
  • Manufacturer.
  • Shelf life. It is applied by the manufacturer to the metal part of the bore hole from the outside. The expiration date is the manufacturing time plus 3 years. The quarter is indicated by the letter V. The number indicates the month.
  • Safety pictograms.
  • What does the marking on the diamond cutting disc mean? As an example, the symbols applied to the tool of the Russian manufacturer ISMA flex are considered (see figure).

    2302.522.2 14A63H39 BU 80 m / s class 2 according to GOST 21963-82, where:

    • 2302,522,2 – (DxTxH) – dimensions: diameter, thickness and diameter of the bore.
    • 14A – grade of grinding material – in this case, electrocorundum is normal.
    • 63Н – grain size – average here.
    • 39 – sound index.
    • B – bunch – bakelite.
    • U – the presence of a reinforcing element – fiberglass reinforcement.
    • 80 m / s – working speed.
    • 2 class of imbalance.
    • GOST 21963-82 – normative document.

    Types of diamond discs for metal

    Diamond discs differ in purpose, design, manufacturing technology.

    • If they are a round steel plate with a strip of diamond grains applied to its outer edge, they are called solid.
    • If they have slots from the edge to the center for about 10-15% of the diameter, necessary for heat dissipation, they are called segmented. They can run at high speeds.
    • If an oblique notch is applied to the surface, then this is a turbo. They are more durable.
    • The slotted and notched diamond cutting disc is the most productive and is called turbo segmented.

    The edge strip of grains is called a cutting edge. Diamond grains come in different sizes and are attached to metal in different ways. The size of the diamonds determines the efficiency of the work and the working life. Coarse grains erase the processed metal better, but wear out more likely. Small ones work on metal more accurately, but their productivity is lower. But they have a higher working resource.

    Diamond grains are attached to the steel plate in various ways: brazing, laser welding, electroplating. The purpose of the tool also depends on the method of fastening. Soldered grain discs are used in conjunction with water cooling. Galvanized grains work well with soft materials. Welded-on diamond blades are good for cutting hard metal alloys.

    The diamonds are fixed in the working rim in a specific order. There are disks with their uniform distribution, when the same number of crystals are found on segments of the same length..

    But there are products in which diamonds are placed at regular intervals (sandwich). They are more productive, put less pressure on the tool, cool better and distribute forces more evenly..

    Diamond blade manufacturers

    Among the manufacturers, the following firms enjoy well-deserved popularity:

    • Bosch. German leader in the production of power tools and related materials.
    • FIT. Canadian firm manufactures tools for professional and domestic use.
    • Dremel. American company producing high quality power tools.
    • Husqvarna. A Swiss company known for its high performance and level of durability.
    • MESSER. Korean manufacturer with a wide range of angle grinder attachments.
    • Zubr. Russian company manufacturing power tools and cutting equipment.
    • Hitachi Power Tools, Luga Abrasiv Extra. Has an excellent value for money.

    Diamond cutting discs are an effective tool for high productivity and provide a comfortable working environment. Do you have experience with them? Be sure to share it in the comments to this article..

    Diamond cutting disc 125 × 1.5 × 22.23 GRAFF Black GDDM12.

    Cutting disc 125x1x22.23 BOSCH Multi Wheel 2608623013

    Diamond cutting disc 125 × 1.5 × 22.23 GRAFF Black GDDM12.

    Diamond disc Whirlwind cutting off segment 230×22.2 mm, dry.

    Cutting wheel for metal Vortex 180×2.5×22 mm

    Cutting disc 125 × 1.6 × 22.23 BOSCH Standard for Metal 26.

    Vacuum diamond disc for metal MESSER 01-61-126

    Cutting disc 125 × 1.2 × 22.2 ZUBR Professional 36859-125

    Diamond cutting disc 125x2x22.2 ELITECH 1820.057400

    Diamond disc for ceramics 115 mm for angle grinder (angle grinder) spl.

    Diamond cutting disc 125 × 2.5 × 22.23 GRAFF GDD 17 125.1.

    Diamond cutting disc 350 × 3.4 × 25.4 GRAFF GDD 18 350.10

    Abrasive Luga cut-off wheel for angle grinder 180×2.5×22.2mm.

    Diamond cutting disc 125 × 22.2 BISON Professional 36659.

    BOSCH 2.608.602.663 Diamond disc Best for Universal an.

    TRIO-DIAMOND Hilber ultra-thin cutting diamond disc.

    Cutting disc 230 × 1.6 × 22.2 ZUBR Professional 36859-230

    Diamond cutting disc 125 × 1.6 × 22.23 BOSCH Standard for.

    Mexcel Metal Cutting Diamond Blade 115mm | Item 31448

    Cutting disc Luga for metal for angle grinder 125 mm, holes.

    Cutting wheel for metal 125×1.0x22 1/50/400 (Luga D110.

    Cut-off wheel BOSCH 2608623012, for wood, 115 x 1.0 x.

    Vacuum diamond disc for metal MESSER 125D-2.8T-3W-.

    Cutting disc BOSCH 2608600542, for metal, 300mm

    Metal cutting diamond disc for angle grinder GRAFF GDDM125.

    Diamond cutting disc 125x2x22.2 ELITECH 1820.057900

    Diamond cutting disc 230 × 22.2 matrix 73150

    Diamond cutting disc TRIO-DIAMOND Hilberg Super Maste.

    Diamond cutting disc Turbo, 230 x 22.2 mm, dry cutting.

    Cutting disc 115 × 22.23 GRAFF Speedcutter 115

    Diamond cutting disc 125 × 22.23 Makita D-51007

    Cutting disc 125 × 1.6 × 22.23 BOSCH Standard for Metal 26.

    Cut-off wheel “Graff”, for metal, 230 x 2.5.

    Diamond cutting disc 150 × 2.4 × 22.2 ELITECH 1820.058500

    Diamond cutting disc 115 × 22.23 Makita D-41676

    Diamond disc for metal Turbo FIT, 115 × 22.2 mm 37472

    Diamond disc Whirlwind cutting segment 125×22.2 mm, dry.

    Diamond cutting disc 115 × 1.9 × 22.23 GRANITE CPS 250811

    Diamond cutting disc 125 × 22.23 Makita D-50980

    Cutting disc (circle) for metal 125x1x22 mm, Luga-abraz.

    Diamond cutting disc 125x2x22.23 BOSCH Standard for U.

    Diamond blade Messer FM / T Vacuum 125 mm (metal)

    Diamond cutting disc “Turbo”, 230×22.2 mm

    Diamond cutting wheel BISON “Professional”, with.

    Cutting disc 125 × 0.8 × 22.23 GRAFF GADM 125 08

    Diamond cutting disc 125 × 1.8 × 22.2 Bizon 0512003

    Abrasive cutting-off wheel “Luga” for metal for.

    Cutting wheel for metal and stainless steel “Hamm.

    Cut-off wheel “Graff”, for metal, 125 x 1.2.

    Diamond cutting disc 115x2x22.23 GRAFF GDD 18 115.10

    FUBAG Multi Master diamond cutting disc

    Cutting disc 115x1x22.23 BOSCH Multi Wheel 2608623012

    Cutting wheel for metal vortex 125×1.0x22 mm

    Diamond cutting disc “Turbo”, 230×22.2 mm

    Cut-off wheel for metal 125 x 1.2 x 22 mm 1/50/400 (L.

    Diamond cutting disc 125 × 1.2 × 22.2 FIT 37443

    Abrasive cutting disc for metal for angle grinder 125×1.2×22.

    Cutting wheel for metal vortex 125×2.5×22 mm

    Cutting diamond disc for metal GRAFF Black for bulga.

    Abrasive cutting-off wheel “Luga” for metal for.

    Cutting disc 125x1x22.23 GRAFF GADM 125 10

    Abrasive cutting-off wheel “Luga” for metal for.

    Segment diamond cutting disc, 125 x 22.2 mm, dry.

    Cutting wheel for metal vortex 180×2.0x22 mm

    Diamond cutting disc TRIO-DIAMOND Hilberg Super Maste.

    Diamond grinding disc (circle) 100 x 20 x 5 mm for sharpening.

    Diamond cutting disc 230 × 2.6 × 22.23 GRAFF GDD 18 230.1.

    Diamond cutting disc 125 × 22.23 Hammer Flex 206-112 DB.

    Diamond cutting disc “Whirlwind”, segment, with.

    Cutting disc BOSCH 2302,522 for metal 2.608.600.225

    Cutting disc (disc) for metal 230 х1.6 х 22 mm Luga-a.

    Cutting wheel LUGAABRASIV 230х2,0х22 for metal

    Diamond cutting disc 125 × 22.23 Makita B-28092

    Diamond cutting disc 115x2x22.2 ELITECH 1820.057800

    Diamond cutting disc 150x2x22.23 Makita B-28101

    Diamond cutting disc 200 × 2.2 × 25.4 Hammer Flex 206-223.

    Cut-off wheel for metal 125 x 1.2 x 22 mm 1/50/400 (L.


    Cutting wheel for metal – scope

    When choosing a cutting wheel, you need to understand that each type has its own purpose and it is not recommended to change this rule.

    Discs for metal are the most common types that differ in their affordable cost. Metal discs can be recognized by their special markings and blue paint finish. Wheels are intended only for metal products and are not recommended for use with stone, as the disc can collapse or wear out quickly. With this nozzle, you can cut a metal profile, any sheet metal, corners, channel.

    Discs for stone differ from the previous type in thickness, corresponding markings and green color. It features a circle and an internal structure that is intended exclusively for stone and ceramic tiles..

    Diamond blades are the most popular and can be used, depending on the markings for metal and wood. When choosing a diamond cutting wheel for metal, pay attention to the markings located on the face of the disc. The letter “A” means that the disc contains artificial corundum, the letter “C” is placed only on silicon carbide nozzles. Next to the letters are numeric designations that indicate the size of the grains. Large numbers indicate that it is possible to cut ferrous metal, small numbers – non-ferrous, the smallest numbers indicate the ability to cut steel.

    Segment and turbo nozzles deserve special attention. Segmented is a flap diamond wheel divided along the edge by narrow slots to better evacuate dust and cool. The turbo disc has through side slots oriented according to the type of rotation. For wet cuts it is best to choose a solid wheel, for dry cuts a flap wheel.

    Choice of Cut-off Wheels for Metal Angle Grinder

    Cutting disc for angle grinder for metal # 8212 is something that every home craftsman must have on the farm..

    This can be explained by the fact that the angle grinder is exactly that universal device that helps to successfully solve many problems around the house..

    Despite its rather compact size, this tool allows you to quickly process various types of metals, as well as concrete.

    In addition, using an angle grinder, you can cut wood, plastic, and many other materials..

    The tool is very often used for sanding a wide variety of surfaces and for a variety of other construction work..

    In order to use an angle grinder for its intended purpose, immediately before starting work, it is necessary to install a cutting or grinding disc on it, which will act as a cutting tool.

    Most often, this versatile tool is used for metal work, in which case you should only use discs that are specifically designed for this material..

    In order to choose the right metal cutting disc for an angle grinder, you need to imagine the very nature of the work to be done..

    Dimensional indicators

    An important role is played by various geometric parameters of the cutting material for metal, since not only the quality of the work performed, but also the ability to perform a variety of surface treatments, from grinding to cutting off, depends on this..

    In order to choose the right abrasive material, it is necessary to know exactly not only the operating parameters of the angle grinder, but also its geometric dimensions..

    You should also find out exactly the diameter of the protective casing on the tool, which will play a decisive role..

    In most cases, the tool used by home craftsmen has a diameter of two hundred and fifty millimeters, but a tool with a diameter of three hundred and fifty millimeters is quite common..

    In this case, the classification of a disc for an angle grinder is quite simple, and in order to correctly determine the choice of a cutting tool, you just need to know exactly the dimensions of your mini-unit.

    It should also be noted that the larger the material for cutting metal in diameter, the longer it can be used. For a grinding wheel, the operating time is influenced by the thickness of the disc..

    When choosing a cutting material for your tool, you should pay attention to the outer dimensions, in particular the diameter.

    So, most often in everyday life, circles with an outer diameter of 125 millimeters are used. A circle of 125 millimeters, despite its small size, allows you to do a large amount of work at home.

    Of course, it is not economically profitable to use diameter 125 for construction work, but for a house it is the most optimal.

    In addition to a diameter of 125, circles with larger indicators can also be purchased. The maximum available disc diameter for an angle grinder is five hundred millimeters, but it is impractical to use it at home.

    You should also pay attention to the thickness of the cutting disc. In the event that it is necessary to make the most accurate cut with a minimum width, a thin disc should be used and vice versa..

    It is necessary to process a thick metal surface with a disc with the maximum thickness.

    The rotational speed of the tool also affects the discs. When working with thin disks, it is recommended to select the minimum.

    Cut-off wheel dimensions

    When choosing the size of the cutting wheel, you need to pay attention to parameters such as the outer and inner diameter of the wheel. The main external parameters can be as follows: 125, 150, 155, 180, 230, 300, 350, 400, 500. If you have a large professional angle grinder, then you can install any of the above attachments on it.

    The inner diameter of the wheel is inserted into the drive shaft of the angle grinder and here it is already necessary to select the nozzle based on the parameters of the tool. Since even if the outer diameter is ok, the inner one may simply not fit..

    How to cut metal?


      Each type of circles must have markings, inscriptions or colored marks.

      Abrasive wheel markings:

      For steel, a soft bond and a fine abrasive are recommended. For non-ferrous metals, the bond should be a hard and coarse abrasive.

      Diamond wheel marking:

      • green # 8212 granite
      • blue # 8212 concrete and marble
      • orange # 8212 brick
      • gray # 8212 roof tiles and granite ceramics
      • yellow # 8212 tile and alabaster.

      Segmented diamond wheels are used in difficult working conditions and for hard materials, this design allows the disc to cool faster, improves waste disposal. They are designed exclusively for air-cooled dry cutting, other uses are strictly prohibited..

      A distinctive feature of diamond wheels # 8212 is increased service life (relative to reinforced ones). There are no diamond wheels for metal.



      The circle label indicates the expiration date, the maximum number of revolutions, the material marking, coded in letters and numbers. After the expiration date, the nozzles become brittle, the abrasive crumbles. The date until which the disc can be used is shown on the label next to the bore hole.

      When buying, you need to pay attention to the maximum number of revolutions. It must be equal to or less than that of the instrument..

      Abrasive discs for an angle grinder must have a coded marking of the abrasive material. Material encoding is deciphered as follows:

      • The material from which the abrasive grit is made is denoted by a Latin letter (or two letters). For example, for a circle with a marking starting with the letter A, the abrasive consists of aluminum oxide. White corundum (AS) – does not cut stainless steel, silicon carbide (C) – generally not suitable for working with metals.
      • The grain size of the abrasive is indicated by the number following the letter designation of the type of abrasive grit. The larger the value, the smaller the particle size. To work with ferrous metals, you need wheels with coarse-grained abrasive (up to 30), for non-ferrous metals, fine-grained (from 40).
      • The hardness of the bond of the abrasive is indicated after the grit. It is denoted by a Latin letter. The further the letter is from the beginning of the alphabet, the harder the abrasive is. The softest bond is A, the toughest bond is Z. Soft abrasive tips are used for hard metals. A hard bond overheats the surface to be treated, cuts with difficulty. The soft ligament will wear out quickly.
      • The ligament material is designated by one or two Latin letters at the end of the encoding.

      For example, a disc marked A24R BF – alumina abrasive, coarse-grained, soft, bakelite bond.

      Angle grinder discs for metal work

      Discs for an angle grinder for metal are selected taking into account a number of parameters. The outer and inner dimensions are important, for which work the wheel is needed, the material of the disc and abrasive, the characteristics of the abrasive chips, the maximum permissible rotation speed, etc..

      Size classification

      The cutting depth, the types of work that can be performed by it, the service life (for cutting wheels), compatibility with a particular tool depend on the size of the disc. You need to select the right one, taking into account the brand of the angle grinder, its power and the bore diameter.

      Possible outer diameters of discs for metal for an angle grinder: 115, 125, 150, 180, 230 mm. Large outer diameters are not suitable for household tools. They are most often used in manufacturing. The outer diameter of the attachment must match the corresponding size of the guard of the angle grinder. The inner (landing) diameter must match the size of the tool shaft. The most common shaft diameter of household angle grinders is 22.2 mm.

      Graff Diamond Metal Cutter, are they better than an abrasive cut off wheel? A better Cut Off Disc!

      The circles also differ in thickness. The thickness of the cut depends on this parameter. A thin disc makes thinner cuts, but will also last less than a thick one. Possible circle thickness: 1; 1.2; 1.6; 1.8; 2; 2.5; 3.2 mm. You can use a disc that is no more than 35% worn out.

      Classification by type of work

      Types of metal processing angle grinder:

      • removing the old paint layer, including from metal surfaces;
      • removal of rust, scale, dirt;
      • cutting;
      • processing of welded seams;
      • grinding and polishing.

      Wheels for metal to an angle grinder are:

      • Cut-off. They are designed for making cuts. The cutting discs for the metal angle grinder have a solid or segmented cutting edge. They are made from several types of materials. The difference in service life, price, features of work. The thickness of the cut-off wheel also plays a significant role. The thickness of the cuts and the durability of the nozzle depend on it..
      • Roughing (grinding) – for grinding and removing from the metal surface of the old layer of paint, varnish, etc. A variety of roughing discs – flap: end, batch, with a mandrel. They are used in metal processing, cleaning welded seams and burrs, removing rust, etc. The end wheel is suitable for processing at an angle and normal flat. The batch disk is used when working over a large area. Mandrel wheels are used when working with cavities. Flap disc works smoother than conventional sander.
      • Stripping – to remove rust, stubborn dirt. These include disc brushes made of hard metal wire.
      • Polishing – for final polishing of surfaces. These include replaceable polishing cloth, foam and fur attachments. Metal polishing can only be done with a variable speed angle grinder.

      Use of discs for other purposes (for example, cutting disc for an angle grinder instead of a grinder) must not.

      Fabric, fur

      For polishing metal, an angle grinder uses various attachments: felt, felt, fur (sheep’s wool), foam. They can be used in combination with polishing paste. A support plate made of plastic or rubber is installed under the attachment on an angle grinder, to which a polishing disc is attached with Velcro.

      It is impossible to use discs for stone, concrete, wood for an angle grinder when cutting, processing metal.


      Carbide – instead of diamond spraying, they have high-carbon molybdenum steels with additions of chromium and nickel at the edges. There are special-purpose carbide discs on sale: for thin, high-carbon, stainless steel, aluminum.

      Material classification

      Metal discs for an angle grinder are made of several types of materials:

      • Diamond.
      • Carbide.
      • Abrasive.
      • From metal wire


      The backing of the abrasive wheel is made of fiber or thick waterproof latex paper. There is a reinforcing mesh between the layers of paper. A layer of abrasive material is applied to the base – particles of zirconate or aluminum oxide, tungsten carbide, ceramic grain or corundum. The binder for the abrasive is resin or polymer. Cutting wheels for angle grinders and grinding discs are made from this material..

      The advantage of an abrasive grinding or cutting disc is the most affordable price. Disadvantages – rapid wear, sparks emission during operation. Cutting metal with an abrasive wheel is accompanied by an unpleasant smell.

      The metal cutting disc can be made of paper with a reinforcing mesh. Fiber discs are used only for grinding and polishing, always with a plastic or rubber backing pad. It serves as a stop and cools the abrasive. Fiber discs are ideal for rough removal of old paint. Abrasives include emery flap attachments designed for processing welded seams..


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