Comprehensive Knowledge & Application Scenarios of Cutting Discs

1. What Is a Cutting Disc

A cutting‑off wheel, commonly known as a resin‑bonded grinding wheel, is pressed at high temperature from abrasive grains, bonding agent and fiberglass mesh reinforcement. It is fitted on angle grinders or cut‑off machines to cut metals, stone and other materials.

Aliases: grinding cut‑off wheel, cutting wheel, thin cut‑off disc

2. Main Classification (by Material & Purpose)

2.1 Metal‑cutting Discs (Most Widely Used)

① Stainless‑steel‑specialized Cutting Disc

‑ Abrasive: Brown fused alumina / Single‑crystal alumina / Zirconia alumina ‑ Features: Ultra‑thin, sharp, low risk of burning, smooth cut, less discoloration on stainless‑steel workpieces ‑ Common specification: 105×1.2×16 (for angle grinders) ‑ Application Scenarios: Stainless‑steel pipes, angle steel, square tubes, security grilles, sheet‑metal parts, decorative profiles. Not for stone cutting.

② Carbon‑steel Cutting Disc (Iron‑cutting Wheel)

‑ Abrasive: Brown fused alumina (A) ‑ Features: Cost‑effective, good toughness ‑ Application Scenarios: Round steel, angle steel, channel steel, steel pipes, rebars, black iron tubing, blank‑cutting for steel‑structure construction

Not recommended for long‑term stainless‑steel cutting; burning and dark cuts may occur.

③ Alloy / HSS Circular Saw Blade (Toothed Saw Blade, Non‑resin Wheel)

Cemented‑carbide‑tipped saw blade with cutting teeth, different from resin‑bonded grinding wheels. ‑ Scenarios: Thin‑wall steel tubes, aluminum profiles, profile cutting machines

2.2 Stone‑cutting Diamond Discs

⚠️ Critical Reminder: Resin‑bonded metal cut‑off wheels CANNOT cut stone! Diamond‑tipped blades are required for stone. Mixed‑use may cause wheel burst!

3. Common Misconceptions

1. ❌ One single disc cuts iron, stone and tiles → Wrong. Metal cut‑off wheels cannot cut stone.

2. ❌ Flip and use both sides of a cutting disc → Not recommended; increases rupture hazard.

3. ❌ Use a cutting disc to grind welds or remove rust → High‑risk forbidden operation.

4. ❌ Higher speed always means faster cutting → Discs have strict speed limits. Overspeed will cause failure.