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9 Inch Grinding Disc (230mm): Maximum Removal for Heavy Industry
The 9 inch grinding disc (230 × 6.0 × 22.2 mm) is the largest depressed-center grinding wheel for handheld grinders. On a 2,600 W-class 230 mm grinder it delivers the maximum legal handheld grinding power — for shipbuilding, heavy structural welds, foundry work and demolition-scale surface removal.
Heavy-Industry Applications
- Grinding multi-pass structural welds on heavy sections
- Foundry and casting cleanup: removing gates, risers and flash
- Ship hull and offshore platform weld dressing
- Rapid removal of thick rust, scale and old heavy coatings
Specifications
| Size | Bore | Max RPM | Max speed | Grinder class |
|---|---|---|---|---|
| 230 × 6.0 mm | 22.2 mm (7/8") | 6,640 | 80 m/s | 230 mm grinder, 2,600 W |
Why 9 Inch for Heavy Work
- Maximum contact area: the widest handheld grinding pass available.
- Longest disc life: the most abrasive volume of any handheld disc — critical on continuous industrial grinding.
- Flat results on big plates: large disc bridges surface irregularities without digging in.
- Industrial grade: double fiberglass reinforcement built for sustained high-load operation.
Safety — Read Before Use
- A 230 mm grinder is a high-energy tool: always use both hands, the side handle and the guard.
- Verify the grinder's rated speed matches the disc (≤6,640 RPM) — never mount a 9" disc on a faster smaller machine.
- Inspect every disc for cracks and check the expiry date; a failed 9" disc is lethal.
- Take breaks — vibration exposure on large grinders accumulates fast.
FAQ
9 inch vs 7 inch grinding disc — when to upgrade?
Upgrade when daily work is large-area grinding or heavy weld removal and operator fatigue from many small-disc passes is the bottleneck. Stay at 7" if you also need maneuverability.
How long does a 9 inch grinding disc last?
Longest of all handheld sizes — commonly a full shift of active grinding on structural steel before replacement.
Can it grind aluminum or stainless?
Stainless: only with INOX-rated 230 mm discs. Aluminum: not recommended — standard wheels load instantly; use dedicated aluminum grinding products.
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