Product Specification
3" X 5/8"-11 KNOTTED CUP BRUSH - STAINLESS STEEL
When stainless surfaces need aggressive cleanup across a broader area, the 3" x 5/8"-11 Knotted Cup Brush - Stainless Steel delivers the stiffness and cutting action needed for rust, scale, weld residue, oxidation, paint, and stubborn surface buildup. Built with 0.020" stainless steel wire, it is made for demanding fabrication and maintenance work where a lighter crimped brush may not be aggressive enough.
The knotted wire construction bundles the wire into stiff, tightly twisted sections that maintain a firm working edge under load. Combined with the cup shape, that creates a broad, stable contact area for cleaning plate, weldments, fabricated components, and other stainless surfaces while still keeping the brush compact enough for good control around edges and assemblies.
Its 3" diameter gives you more working coverage than smaller cup brushes while preserving maneuverability. A 5/8"-11 threaded arbor provides quick spin-on installation on compatible angle grinders, and the brush carries a 14,000 RPM maximum rating. For shops that keep stainless tooling segregated, this is a strong choice for aggressive cleaning without introducing carbon steel wire to the workpiece.
Product Specifications
| Specification |
Details |
| Diameter |
3" |
| Wire Material |
Stainless Steel |
| Wire Diameter |
0.020" |
| Wire Style |
Knotted |
| Brush Type |
Cup Brush |
| Arbor |
5/8"-11 Threaded |
| Maximum RPM |
14,000 |
Features
-
Aggressive knotted-wire construction for medium- to heavy-duty surface cleaning
-
0.020" stainless steel wire for stainless fabrication and contamination-sensitive work
- Cup-style geometry provides a broad, stable working area
-
3" diameter balances increased coverage with maneuverability
- Stiffer and more aggressive than flexible crimped-wire cup brushes
-
5/8"-11 threaded arbor for quick spin-on installation
- 14,000 RPM maximum rating
- Excellent for weld cleanup, rust and scale removal, paint removal, and stainless surface preparation
- Strong choice for fabrication, maintenance, repair, and general metal cleaning
Applications & Performance
Knotted cup brushes are built for aggressive broad-surface cleaning. Their cup-shaped profile places multiple wire knots against the workpiece at once, helping remove stubborn buildup efficiently across flat and moderately contoured surfaces.
Common applications include:
- Heavy rust and corrosion removal
- Weld cleanup
- Removing weld residue and spatter
- Scale and oxidation removal
- Paint and coating removal
- Cleaning stainless plate
- Surface preparation before welding
- Cleaning fabricated stainless components
- Preparing metal before coating or repair
- General industrial maintenance
The 3" cup profile provides more surface coverage than smaller cup brushes without becoming overly bulky. Use controlled pressure and let the wire tips perform the cleaning rather than forcing the brush into the workpiece.
Materials
Especially suited for:
- Stainless steel
- Stainless steel weldments
- Stainless fabricated components
- Other compatible metals where stainless wire brushing is appropriate
Keep this brush dedicated to stainless steel work when preventing cross-contamination is important. A stainless wire brush previously used on carbon steel can pick up iron contamination and transfer it back to a stainless workpiece.
Store stainless and carbon steel brushes separately for contamination-sensitive applications.
Machine Compatibility
Use this 3" cup brush on a compatible angle grinder with a 5/8"-11 spindle, adequate brush capacity and a maximum speed no greater than 14,000 RPM. Match the actual hub seating and allow room for wire flare.
Compatible examples include:
-
Benchmark Abrasives BMT-AGBC4570_1 — 4-1/2" corded angle grinder; 5/8"-11 spindle; 11,000 RPM.
-
Makita® 9557PB — 4-1/2" angle grinder; 11,000 RPM.
-
Milwaukee® 2880-20 — 4-1/2" / 5" angle grinder; 8,500 RPM.
-
Milwaukee® 2881-20 — 4-1/2" / 5" angle grinder; 8,500 RPM.
Other machines may be compatible. Use the manufacturer-specified wire-brushing setup and guard, with secure hub engagement and adequate operating clearance. Other grinders meeting these requirements may also be suitable.
Safety Tips
- Never exceed the brush's 14,000 RPM maximum speed.
- The brush's rated RPM must meet or exceed the maximum operating speed of the power tool.
- Confirm the grinder is designed to safely accommodate the cup brush and its operating wire flare.
- Inspect the brush before every use and replace it if damaged, excessively worn, loose, or distorted.
- Confirm the 5/8"-11 threaded arbor is fully seated and secure before operation.
- Use the appropriate grinder guard and maintain adequate clearance around the rotating brush.
- Wear proper PPE, including eye and face protection, hearing protection, gloves, appropriate clothing, and respiratory protection when required.
- Keep bystanders away from the work area and direction of rotation.
- Use controlled pressure. Excessive force bends the wire and can accelerate wire fatigue.
- Allow the grinder to reach operating speed before contacting the workpiece.
- Keep stainless brushes dedicated to stainless work when cross-contamination matters.
- Follow all operating and safety instructions for both the power tool and wire brush.
