Grinding Discs – The Ultimate FAQ Guide

Are you looking for grinding discs for professional use?

Syndent is a leading manufacturer and supplier of rotary tools in China. In addition, Syndent provides grinding discs to many industries.

These are also called angle grinders or side grinders. It is a powerful tool used for cutting, polishing, deburring, and cutting different materials. These discs are manufactured with an abrasive compound.

Syndent provides a variety of grinding discs in one or more packs for customer’s convenience.

Let’s discuss its manufacturing process, types, standard sizes, shapes, and other features.

What Are Grinding Discs?

Grinding discs, also called angle grinders, are a reliable and powerful tool for cutting, shaping and carving different materials.

Syndent manufactures the grinding discs with solid raw materials. It is a thick disc that works at a specific angle and rotates at a very high speed.

Syndent makes these discs with abrasive coated raw materials using advanced technology and the latest CNC machines.

Syndent produces these rotary discs by bonding the cementing matrix and composite material of coarse-particle. As a result, the grinding discs are formed in solid circular shapes. The discs are powered by compressed air or electric motors.

grinding discs

What Does Grinding Disc Do?

Syndent grinding discs are versatile tools and can scratch, cut, polish, and sharpen various materials. The discs are used to cut metal, tile, concrete, wood, stone, etc.

You can efficiently use these discs to remove extra materials from your workpiece. They can remove dust, paint or, rust effectively.

Some other uses of grinding discs are as follows:

  • You can use the discs to remove excess materials from a workpiece.
  • These discs are available in various shapes and sizes.
  • It reduces the workload and increases work efficiency. The discs are used in different industries in their routine tasks.
  • You can also utilize these discs conveniently in construction, metalworking, and also in emergency rescues.
  • These discs are used for lighter-duty jobs.
  • The grinding discs are also used for matte finishing, blade sharpening, removal of rust, etc.
  • Syndent provides you durable, resistant, and cost-effective discs.
  • Syndent’s rotary discs are specially designed to use effectively removing sand.
  • The grinding discs are manufactured with a high-quality abrasive compound. Therefore the tools are durable, resistant, and have long-lasting life.

grinding discs

What Is the Difference between Grinding Disc and Cutting Disc?

  • Cutting disc is used only to cut different materials, but grinding discs are used for grinding, polishing, and removing excess materials from your workpiece.
  • A cutting disc is thin in size than a grinding disc.
  • The grinding rotary discs are used for smoothing chipped edges and cracks, while the cutting disc is used to cut through rigid materials.
  • Cutting discs are thin and possess more strength than grinding discs.
  • Working with both discs is convenient; however, you need to be more precise while using a cutting wheel.
  • Cutting discs contain less power. They have a motor of 1hp. On the contrary, grinding discs are powerful, and their motor is from 3-7hp.
  • Grinding rotary discs work on large pieces of metal while cutting discs cut small pieces of metal.

Syndent’s grinding discs are versatile tools and used for different tasks in industries. Our tools are manufactured with abrasive compounded raw materials and have durable life than cutting tools. If you work with heavy materials, we suggest you use these discs.

With the use of Syndent’s rotary discs, you can perform various tasks and increase work efficiency.

So, boost your business now with Syndent’s efficient grinding discs.

How Grinding Discs Are Manufactured?

Grinding discs are manufactured with abrasive raw materials using advanced CNC machines. Syndent’s rotary discs are mostly found in workshops and industries.

The manufacturing process of these discs includes the following steps:

Raw Materials

The two primary components to make grinding discs are abrasive grains and bonding materials.

The two raw materials blend to create a disc. A disc is produced with such properties to shape, cut, or deburr a particular material in any shape.

In the making and working of the rotary discs, abrasive grains play a vital role. The raw materials of grinding discs have extreme strength and hardness as compared to diamond.

Syndent gathers high quality raw material from state owned companies. You can trust Syndent for providing you durable and solid grinding discs.

grinding discs

Quality Control

Syndent checks and ensures the quality of the raw material and the manufacturing process. Your grinding discs are precisely checked according to the specific standards. The abrasive grains, labels on the discs, and their safe use, are thoroughly inspected.

The quality of these discs depends upon the cost, size, and their use. Syndent’s engineers give special attention in the manufacturing process of the discs that are more than 6” diameter.

It is an extensive length disc that has the potential to break your workpiece and cause injuries during use. A test called Acoustical test is conducted to check the correct hardness, stiffness, and adequate strength of your rotary discs for grinding.

Mixing the Ingredients

The next step of manufacturing is to mix the ingredients. To prepare the grinding discs according to a specific formula, abrasive grains and bonding materials are collected.

Some manufacturers mix all the raw materials in a single mixer. Syndent uses separate steps to mix all the materials with the blender.

The raw materials and addictives are mixed according to a specified formula with significant consideration of properties for shaping the materials in the desired shape.


The mixture of raw material is poured into four-part mold shapes in specific amounts carefully. The mold contains a central pin called an arbor hole, an external shell to hold the flowing of the mixture, or two flat disks of the same dimensions.

The mixture, when poured into the mold, a flat edge around the center hole is used for leveling the blended mixture. Syndent applies a constant pressure of 100 – 5000 pounds/sq inch, for 20 – 30 seconds.


The next step is the firing process. The firing process heats the final bond with the last grinding discs, removes abrasive crystal grains, and smoothens the discs. The firing process is conducted to melt the extra materials during grinding.

Syndent high-grade grinding discs are fire-resistant. They can bear high temperatures during excessive grinding.

Rotary discs made up of variable materials are heated at variable temperatures. Syndent’s discs are usually heated at a temperature ranging from 300 – 400 degrees Fahrenheit.


After firing, grinding discs are moved to the finishing area. In the finishing process, Syndent marks labels and logos on your high-grade discs.

Once labels and other markings are completed, the discs are packed for final shipment to the consumer. You can get Syndent’s best grinding discs with high-quality, durability, and fine finishing.

How Many Types of Grinding Discs?

Syndent manufactures grinding discs with abrasive grains and bonded materials. You can classify the rotary discs into several types based on their shape, bonded material, production technique, etc.

Classification by Shapes

The grinding discs are produced in various shapes and sizes. Some of the shapes are as follows:

Straight Wheel

The most common type of grinding discs is a straight wheel disc. The discs are used for grinding operations.

grinding discs


Cylinder shape discs have large and wide surfaces. These discs are used in horizontal and vertical grinders and also used for flat surfaces.


A tapered disc is straight and tapered outside towards the center of the disc. This disc is more substantial than the straight wheel.

Dish Cup

A cup-style grinding disc is used in cutter grinding.

Cut off disc

Cut-off grinding discs are thin in width and used in construction sites for cutting or trimming materials. You can find these discs in 75 – 400mm diameter and 300 – 400mm diameter for portable and fixed machines, respectively.


Concave discs are also used for cutting purposes. The diameter of concave grinding discs ranges from 75 – 250mm, and the thickness ranges from 2 – 10mm.

Classification by Abrasive

According to the abrasive difference, grinding discs are classified into four types:

Zirconia Alumina

When you want bonded material for rough and tough materials cutting, you need zirconia alumina grinding discs. It creates a durable cut that works great on steel or stainless steel.

Silicon Carbide

The discs with silicon carbide materials are used for sharp grinding surfaces. It is used on non-ferrous materials like plastic, rubber stone, and glass.

Aluminum Oxide

Aluminum oxide is used to grind materials like carbon steel, high speed steel, wrought iron, bronze, alloy steel, and more.

It is among the most commonly used abrasives for making grinding discs.

Diamond Wheel

The diamond wheel discs are rigid and are used to cut hard materials like concrete, glass and gemstones.

grinding discs

Classification by the Bonded Material

The abrasives are bonded together by using specific materials to give strength to the grinding discs.

The purpose of bonding agents is to prevent the disc from losing its shape due to excessive grinding.

The classification of discs as per bonded materials is as follows:

Resin Bonded Abrasive Discs

Resin bonded discs are the ones that are made by mixing resin with the abrasive. The grit size and spacing determines the grinding results.

For example, finer grits give less material removal with a smoother surface on the other hand, coarse grits are ideal for stock removal.

Resin helps to bond the grits tightly and gives strength to the grinding wheel. It’s a tough bonded-disc that gives you the desired grinding results.

Vitrified or Ceramic Bonded Discs

It is the most commonly used bond to hold the grits together. Vitrified bonds are glass bond compositions or glass-ceramic compositions.

These are the ideal discs to remove unwanted metal stocks quickly. Tool-makers and die-makers use vitrified discs to get adequate grinding results.

Metal Bonded Diamond Discs

These are the toughest of all bonded discs. Powdered metal is used to bond the grits together. Compounds that contain cubic boron nitride or diamond are used to give the grinding disc a firm shape.

Rubber Bonded Grinding Discs

It is an organic bond. It is used in discs that are made for smooth grinding results. These discs are formed by mixing the grits with rubber and sulpher.

These discs are as strong and resilient as discs with other bonds. However, you can get soft and smooth finish after working with rubber bonded grinding discs.

How to Use Grinding Discs Safely?

Safety must be your priority while working with the grinding discs. These discs are produced with hard-to-break raw materials which contain extreme strength.

If you follow precautionary measures while working with the tools, you can prevent injuries.

Syndent grinding discs spin at a speed of 10,000 to 11,000 RPM (Rotation per Minute). In the process of cutting or shaping tools, small particles occurred on the rotary discs, which are harmful to hands and eyes.

Consider the following precautions before working with grinding discs:

  • Protect your face and hands with a face shield and gloves.
  • When you are changing the discs, unplug the grinder.
  • Attach and fit the grinding discs according to the proper guidelines.
  • Maintain grip on the grinder with both hands.
  • You must not use the discs without their guard or handle attached.
  • It would be best of you run the new grinding discs for a minute before using them to ensure that discs are not defective.
  • Keep the other workers away. Everyone should wear safety glasses.
  • Keep the sharp discs away from children.
  • Maintain and service the discs as per the manufacturer’s recommendations.
  • Ensure the workplace floor is clean.
  • Do not operate grinding discs on a wet floor.

grinding discs

How Do You Remove a Grinding Disc?

Attaching and removing a grinding disc differs from tool to tool. To remove a grinding disc, include the following steps:

  • Disconnect the power
  • Use factory spanners to remove the disk
  • Remove disk with improvised spanners
  • Remove the disk and install a new one

Disconnect the Power

The grinding disc is a tool that should observe at all times. Always ensure to disconnect the power source of the grinder before changing or removing a disc.

If you are using a battery-operated rotary tool, ensure to remove the battery first. It would be convenient for you to change the disc after removing the battery, as the tool becomes lighter. When changing the grinding disc, you must unplug the power supply.

Use Factory Spanners to Remove the Disk

Wrench and spanners are used to remove and add a grinding disc. One wrench is fork-like and the other looks like an ordinary wrench. First, check the holes between the motor and the disk.

After that, use a wrench on the disc bottom side. Ensure that you move the wrench in the opposite direction of the arrow shown on the disc. Keep the nuts turning until you get the disc out of the grinder.

Remove Disk with Improvised Spanners

To remove the grinding discs, first of all, grip the attached disk tightly. It will ensure the disk in a position and prevent from spinning. This process is simple than others.

Then, take a screwdriver and insert it into the holes between the motor and the disk.

By pulling the screwdriver in the opposite direction the disk will get loose.

Remove the Disk and Install a New One

After loosening the disk, now you can easily remove the grinding disc by using your hands. Remove the old disc and replace it with the new one. Tight the new disk with a screwdriver following the same procedure.

By following this process, you can easily remove the grinding disc and replace the new disc. After the recommended time, you must remove the discs to work correctly. Check the cleaning and maintenance of the grinding discs to increase their efficiency level.

Which Industries Use Grinding Discs?

Generally, production industries that deal with wood, metal, stone, aluminum, and other materials use grinding discs for their daily routine tasks. Syndent manufactures the durable discs with high-quality abrasive grains and bonding materials.

You can use the grinding discs in various tasks and in different sectors. The industries that use our tools are as follows:

  • Fabrication shops
  • Construction sites
  • Die grinders
  • Bench grinders
  • Metalworking
  • Emergency rescues
  • Body repair shops
  • Workshops
  • Service garages
  • Casting
  • Machining
  • Metal stamping

grinding discs

Can Grinder Discs Use in Drills?

Yes, you can use the grinding discs conveniently with your drill. By using cordless drill machines you can grind hard-to-reach areas quickly.

Syndent creates the discs with high-graded raw materials using advanced CNC machines. The tools have extreme strength, hardness, and ability to drill stone, concrete, wood, steel, etc.

Syndent manufactures grinding discs in different sizes and shapes like diamond cut, metal, sanding pad, cut-off, flap, etc.

Can I Cut Metal with Grinding Discs?

Syndent manufactures grinding discs with abrasive and top-quality raw materials. The discs are hard enough to cut steel, stainless steel, wood, metal, etc. When it comes to cut metal, Syndent’s rotary discs save a lot of time.

A high-powered grinding disc can easily cut any metal. When you cut or shape the different types of metals, tiny particles called debris occurred on the metals.

These tiny particles can cause harm to your eyes and hands. It is recommended that you must wear safety gadgets and other protective equipment during grinding tasks.

Industries mainly deal with cutting, shaping, deburring, grinding, and carving different types of metals. For small spaces they prefer using Syndent’s carbide burr set for their routine tasks. It increases the efficiency level of the work and reduces workload.

grinding discs

Can I Use Grinding Discs to Cut Wood?

Syndent’s grinding discs can quickly shape and cut wood. Our tools are manufactured with a handful of cutting styles that can cut or shape wood in any desired form.

The grinding discs are the most popular tools for wood cutting in different sectors.

Syndent’s discs are produced with high-quality raw materials that can cut metal, bricks, concrete, steel, wood, etc. There is a saw blade attached with your grinding discs that utilize three teeth and have enough power to cut wood effectively.

Mostly, construction and manufacturing sites need discs for the cutting of different materials. The blades of the discs are too sharp that can cause injury. So, cover yourself with protective gadgets before working with these discs.

Industries also use Syndent’s carbide burr for wood carving to shape, carve, engrave, cut, or polish wood for an eye-catching view of your workpiece.

Syndent’s high-quality rotary tools are ideal for your wood cutting and carving business.

Can I Cut Stone with Grinding Discs?

Syndent produces grinding discs which can cut, grind, and polish a stone quickly. You can get these discs in variable sizes.

You can select any size as per your project demands. While cutting a stone, you need a suitable tool for finishing.

The grinding discs come with various cutting styles and accessories that can cut a stone quickly. A dry-cut rotary disc is the best option for cutting a stone. It might be expensive than other discs but can easily and effectively cut your stone in the desired shape.

Syndent values your safety that is why, before cutting a stone, make sure you are safe. Stone cutting creates a lot of dust, so work with care and in a specific area where you can easily clean your grinding discs after the cutting.

Can You Use Grinding Discs on Concrete?

Syndent produces grinding discs in variable shapes and sizes. The discs are the most convenient tool for concrete cutting work.

You can use a diamond-cut disc to cut concrete. Syndent provides various types of rotary discs to cut different materials.

The diamond-cut grinding discs contain specific diamond blades, which cost a bit more than a normal blade but can cut concrete efficiently and lastly.

What Other Materials Grinding Discs Can Cut?

Syndent designs and manufactures grinding discs that are used for cutting different materials. We produce tools in various shapes and designs used to perform many functions.

You can cut different materials with your high-grade discs. Some of them are as follows:

  • Concrete
  • Metal
  • Wood
  • Stone
  • Steel
  • Stainless steel
  • Aluminum
  • PVC
  • Ceramic tiles

On What Materials Grinding Discs Cannot Work?

Grinding discs work effectively when their grains and grits are in perfect condition. Clogging may affect the grinding results.

So, the materials that clog the grinding wheels must be avoided or use with special techniques. These materials include:

  • Plastic
  • Aluminum
  • Stainless steel
  • Brass

Using your grinding discs on tough materials like diamond (or materials with similar hardness) can cause damage to the grains or the bond.

So be precise while working with your grinding wheels.

What Are the Standard Sizes of Grinding Discs?

Syndent’s grinding discs are mostly used for cutting, shaping, and polishing particular hard or resistant materials.

You can choose disc types as per your project requirements. We produce different types of discs like cut-off, diamond, etc.

Syndent produces each type of disc in multiple sizes, for your convenience. Some standard sizes of the grinding discs include:

  • 115mm (4.5 inches)
  • 125mm (5 inches)
  • 150mm (6 inches)
  • 180mm (7 inches)
  • 230mm (9 inches)

The most common size of the grinding discs is the smallest size of 115mm or 4.5 inches. These discs are mainly used to cut, grind, sharpen other tool’s blades, or remove light stock from the materials.

These discs operate at a very high rotational speed, mostly at 10,000 RPM or higher.

What Grit Discs Remove Rust?

Grit is the abrasive grains used to manufacture grinding discs. The discs are used for the removal of heavy stock and give a fine finishing to your workpiece.

Grits vary in size as per numbers. The higher number of grits is suitable for creating a smooth and fine finishing to the materials. While lower-number grits are used to dig deeper and to remove rust.

Syndent grinding discs are ideal tools for removing paint or rust. The efficiency level of the tool decreases due to rust and performance also gets affected. When you have the right tool, removing rust from your workpiece is very easy.

What Features Should I Consider Before Buying Grinding Discs?

The grinding discs have some specific features that can improve cutting abilities. Syndent’s discs have extreme strength, high work efficiency, long-lasting life, and give smooth finishing to your workpiece.

Before buying grinding discs, you should consider the following features:

grinding discs

Disc Size

Syndent manufactures a wide range of sizes but most commonly used disc size includes 115mm (4 ½) and 230mm (9).

The size of the disc will depend on the task you have to perform. It is mandatory to check the compatibility of your grinder with the disc while buying.

Disc Thickness

The thickness of the grinding disc varies. You must choose an appropriate thickness according to the material you need to grind.

For example, a standard thickness of 1mm or 1.6 mm is used for everyday tasks on metals. However, Syndent also manufactures thinner and thicker discs than the standard size.

Thinner discs are ideal for precise results whereas, thick grinding discs are helpful to cut thicker materials.

Disc Grain

The grain sizes vary in each disc. Syndent manufactures grinding wheels with variable grain sizes. Like:

  • 10 – 24 (coarse grits)
  • 30 – 60 (medium size grits)
  • 80 – 200 (fine grits)
  • 220 – 600 (very fine grits)

You must choose the disc with appropriate grain density. Coarse grits are suitable for stock removal and fine grits (as the name suggest) are ideal for smooth grinding.

Hole Size

Syndent manufactures grinding wheels with three standard holes sizes:

  • 16mm or 5/8 inch (for 100mm grinding discs)
  • 23mm or 7/8 inch (for 115 – 230mm grinding discs)
  • 4mm or 1 inch (for 250 – 400mm discs)

You can also get custom hole sizes according to your application requirement. However, too large or too small holes may hinder the grinding procedure.

Having an adequate hole size is essential to prevent injuries and accidents.

Grinding Disc Hardness

Grinding disc’s hardness depends on the type of abrasive and the bonding material used in them. Syndent uses variable abrasives and bonding agents to manufacture durable and strong grinding wheels.

It is the bonding material that gives strength to your grinding disc. Based on this strength Syndent recommends you to use these discs on the following surfaces:

  • Diamond in the form of a bonded disc is ideal to machine tough materials like marble, cemented carbide, and granite.
  • Aluminum oxide is suitable to work on steel, wrought iron, brass, and steel alloys.
  • Silicon carbide discs are ideal to grind cast iron, aluminum and cemented carbide.
  • Zirconia alumina discs are highly resistant to heat and are most commonly used in the process of steel fabrication.

The Grinder’s Power

Your grinder must have the ability to generate a specific amount of energy to run the grinding disc. The wattage required to work with the grinder is determined by the size of the disc.

Moreover, a particular level of pressure is required for Syndent’s grinding disc to work efficiently.

The Speed

The grinding discs work at a specific RPM (Rotations per minute) range. A medium-size disc is expected to work faster than 8000 RPM.

On the other hand, a larger grinding disc may generate 6000 RPM. The capacity of smaller discs is to generate higher power than larger discs.

What Is the Lifespan of Grinding Discs?

The grinding discs are produced with high-quality raw materials and have extreme strength and durability.

The average life span of Syndent rotary discs is two years from the manufacturing date. The life span of the tools depends on the storage conditions.

After two years, the grinding disc’s speed is re-tested to check the condition of the tool. If the tools remain in poor storage conditions, the tool has a much shorter life.

When Should I Replace My Grinding Discs?

Syndent grinding discs are made with top-quality raw materials using advanced CNC machines. But like other tools, Syndent durable rotary discs also have a specific time to use.

After the recommended time, you should replace your grinding discs with the new ones. When you observe the flattened grits or damages edges, it is time to stop using the disc.

You must check the maintenance and cleaning process of the disc after some time. It enhances your tool’s life, durability and efficiency level.

What Is Turning and Dressing of Grinding Discs?

It is understandable that after some time the grinding discs, like all other tools, also wear and tear. It causes poor surface finishing.

The process of restoring your discs is called dressing. Unless you replace the whole disc, you can also repair the old one.

The dressing of Syndent’s discs restores the tool’s sharpness. It can be done by removing old grains and other small particles. A grinding dresser is a tool used to dress the grinding discs.

grinding discs

What Are the Dressing Tools for Grinding Discs?

There are various types of dressing tools that are used to dress grinding discs. The typical three tools are a diamond dresser, rotary dresser, and dressing stones.

Diamond dresser

Diamond dresser tools look like a pencil. It is a tool used in industries for dressing or turning the surface of grinding discs. The tool has a single point, multi-point, and other types.

Rotary dresser

A rotary dresser is a tool that is used for profiling the grinding discs. The tools are used in high-tech industries to dress the discs.

Dressing stones

Dressing stones are made of aluminum oxide. You can use them for the dressing of diamond grains, stones, and sharpening the grinding discs.

grinding disc

How to Balance Grinding Discs?

Syndent’s grinding discs need proper balancing to cut or shape different materials. If you don’t want any breakage or damage to the materials, balance your discs properly.

The balancing of Syndent’s grinding discs includes eight steps:

  • Ring your wheels
  • Spin the wheel
  • Attach the wheel
  • Attach the balancing arbor
  • Remove the weights and spin the arbor
  • Put the weight back
  • Tight the flanges with a screwdriver
  • Remove the arbor and spin the wheel to check the balance

Why Trust Syndent’s Grinding Discs?

  • Syndent is a trusted rotary tool manufacturer and supplier is China for the past 11 years.
  • Syndent manufactures grinding discs with abrasive grains and compounded raw materials using advanced CNC machines.
  • Syndent offers rotary discs in various sizes and types classified by shape, material, etc.
  • Syndent’s high-grade discs are used to cut, shape, and grind different materials.
  • You can use our tools in different industries like construction, metalworking, emergency rescues, casting, workshops, etc.
  • The grinding discs are used to cut various materials like metal, steel, wood, stainless steel, concrete, ceramic tiles, etc.
  • Syndent provides you with high-quality grinding discs at competitive prices.
  • Syndent always responds to our clients in a very short time. You can contact us through calls and emails and get a quotation right away.

grinding discs

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