BLOGS
4 Inch Grinding Disc (100mm): Precision Grinding for Small Grinders
What a 4 Inch Grinding Disc Does Best
- Grinding small welds on furniture, railings and light frames
- Deburring and chamfering in auto repair and machine maintenance
- Cleaning rust and scale inside channels, corners and confined areas
- Detail work where a 4.5" or larger disc would over-reach the surface
Specifications
| Size | Bore | Max RPM | Max speed | Grain |
|---|---|---|---|---|
| 100 × 6.0 mm | 16 mm (5/8") | 15,200 | 80 m/s | A24–A30 (brown fused alumina) |
Why Choose the 4 Inch Size
- Control: small disc + light grinder = precise material removal without gouging thin workpieces.
- Speed: 15,200 RPM keeps grinding fast despite the small diameter.
- Access: fits between tubes, inside boxes and along narrow welds.
- Comfort: lowest vibration and tool weight for all-day detail grinding.
Technique
- Work at 15–25° to the surface with steady, light pressure.
- On thin sheet (under 3 mm), reduce pressure — small discs still remove metal fast.
- Never use the disc edge to cut — this is a grinding-only wheel.
FAQ
Can a 4 inch grinding disc remove a weld completely?
Yes — for fillet welds on light fabrications it grinds flush quickly. For structural welds, grind the cap but never grind below the parent metal surface.
4 inch grinding disc vs flap disc for small jobs?
The grinding disc removes metal faster and handles edges better; a 100 mm flap disc finishes smoother. Heavy weld → grinding disc; blending → flap disc.
How long does a 4 inch grinding disc last?
Expect several hours of active grinding per disc on mild steel. Replace when worn near the label or when grinding rate drops.
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