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Wire Cup Brush (Bowl Brush): Fast Rust Removal on Large Flat Surfaces
A wire cup brush (also called a bowl brush) mounts on an angle grinder with its wires pointing forward from a cup-shaped body. It is the powerful cleaning tool for heavy-duty work on large flat surfaces — deburring, rust removal, paint removal, slag and scale cleaning.
Cup Brush vs Wheel Brush
- Cup brush: wires face forward — sweeps wide flat areas (floors, plates, tanks, beams) quickly.
- Wheel brush: wires face outward — works edges, corners, narrow channels and tubes.
- Rule: big flat area → cup; edges and tight geometry → wheel.
Specifications
| Type | Diameters | Wire | Max RPM |
|---|---|---|---|
| Knotted twist bowl brush | 65 / 80 / 90 / 100 / 125 mm | 0.35/0.5 mm steel | 12,000 (65mm) → 6,500 (125mm) |
| Crimped bowl brush | 75 / 100 / 125 / 150 / 175 / 200 mm | 0.30/0.35 mm crimped brass-coated steel | 20,000 (75mm) → 9,000 (200mm) |
Typical Applications
- Stripping rust and old paint from steel plate, decks and structural beams
- Cleaning weld slag and discoloration over long seams
- Descaling hot-rolled steel before fabrication
- Prepping concrete formwork and removing gasket residue
Usage Tips
- Work with the brush nearly flat, using the wire tips — tilting digs one side and kills the brush fast.
- Light pressure: flared wires cut poorly and break off early.
- Match RPM: a 125 mm cup brush must run ≤6,500 RPM — check your grinder's speed setting.
- Full PPE: face shield, gloves, long sleeves — cup brushes throw wire fragments.
FAQ
What size cup brush for a 4.5" angle grinder?
A 75–100 mm cup brush with M14 or 22.2 mm mounting is the practical match for power and control.
Knotted or crimped cup brush for rust?
Deep, pitted rust → knotted. Surface rust and paint → crimped is faster to control and leaves a better finish.
Can a cup brush be used on wood or aluminum?
On aluminum only with brass/stainless wire and light pressure. On wood, wire brushes are used deliberately for grain texturing — use crimped wire and test first.
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