Cutting Discs

Q1: What is a cut-off wheel?

A1: A cut-off wheel (also called a cutting disc) is an abrasive tool used to quickly cut materials such as metal, concrete and stone. Its portability allows the operator to move freely and operate the tool from different angles for cutting. Common tools include die grinders, angle grinders, pneumatic/electric cutting tools, cut saws, circular saws and gasoline saws. It is mainly used to cut pipes, rusty bolts, metal components and car body panels.

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Q2: What is the material of the cutting disc?

A2:

• ​ ​Main material​ ​: Made of resin binder (resin oid) bonded with abrasive. During use, the binder gradually wears away, exposing new sharp abrasive grains to extend life.
• ​ ​Core abrasive​ ​: Commonly used aluminum oxide (Al₂O₃) and silicon carbide (SiC).
• ​ ​Reinforced design​ ​: Durable cutting discs are reinforced with glass fiber to increase strength and prevent breakage under high pressure.

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Q3: What are the main types of cutting discs?

A3: Classification by structure and thickness:

• ​ ​Type differences​ ​:
• ​ ​T1 type (Type 1): Overall flatness, no depression.
• ​ ​T27 type (Type 27): The center area is depressed to avoid interference with the tool flange/locking nut, and flush cutting can be performed close to the surface (such as cutting bolts).
• ​ ​Thickness selection​ ​:
• ​ ​Ultra-thin type (0.04″/0.045″≈1.0/1.1mm): Faster cutting, less material loss, suitable for precision metal cutting.
• ​ ​Standard type (thicker than 0.04″) ​ ​: More durable, reduces the need for grinding wheel swing during cutting.

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Q4: What kind of cutting disc should be used for cutting aluminum?

A4: You need to use ​ ​special aluminum cutting discs ​ . Because aluminum has a low melting point and soft texture, ordinary grinding wheels can easily cause the material to melt or produce burrs. Special cutting discs use specially formulated aluminum oxide and silicon carbide abrasives to keep low temperatures to avoid adhesion. They are suitable for cutting soft non-ferrous metals such as aluminum, brass, bronze, and copper.

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Q5: What is the difference between cutting discs and grinding discs?

A5:

• ​ ​Similar structure ​ ​: Both are made of resin-bonded abrasives and are available in T1/T27 types.
• ​ ​Core differences ​ ​:

​ ​Features ​ ​	​ ​Cutting discs ​ ​	​ ​Grinding discs ​ ​
​ ​Thickness range ​	0.04″–3/32″ (≈1.0–2.4mm)	1/8″–1/4″ (≈3.2–6.4mm)
​ ​Application ​	Cutting off materials at 90°	Grinding surfaces at multiple angles
​ ​Safety warning ​	​ ​Strictly prohibited for grinding operations ​	Designed for grinding

• ​ ​Risk warning ​ ​: Grinding with a cut-off disc may cause the grinding wheel to break under high-speed rotation, which is extremely dangerous!

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Q6: What are the safety guidelines for using a cut-off disc?

A6:

1. ​ ​Always wear PPE ​ ​ (protective glasses, gloves, mask, etc.).
2. ​ ​Maintain a 90° vertical cut ​ ​: Angle cutting may cause the grinding wheel to jam or break.
3. ​​It is strictly forbidden to use cutting discs for grinding​ ​(see Q5).
4. Choose a grinding wheel type that is compatible with the tool (e.g. T27 is suitable for close cutting).