Product Specification
4" x 5/8"-11 Knotted Cup Brush - Stainless Steel
For aggressive cleaning on stainless steel and other contamination-sensitive work, the 4" x 5/8"-11 Knotted Cup Brush - Stainless Steel delivers stiff wire action across a broad working area. Built with 0.020" stainless steel knotted wire, it is designed to attack heavy rust, scale, weld residue, oxidation, and stubborn surface buildup while helping fabrication shops maintain dedicated stainless tooling.
The knotted wire construction keeps the wire bundles stiff under load, producing a more aggressive cleaning action than flexible crimped wire. Combined with the broad cup profile, that stiffness makes this brush a strong choice for demanding surface preparation on plate, weldments, fabricated components, and other larger stainless surfaces.
A 4" diameter and 5/8"-11 threaded arbor provide direct spin-on installation on compatible angle grinders. The published maximum speed for this brush is 14,000 RPM; because this rating differs from the corresponding carbon-steel 4" cup brush in the product family, always verify the actual brush label before use.
Product Specifications
| Specification |
Details |
| Diameter |
4" |
| Wire Material |
Stainless Steel |
| Wire Diameter |
0.020" |
| Wire Style |
Knotted |
| Brush Type |
Cup Brush |
| Arbor |
5/8"-11 Threaded |
| Published Maximum RPM |
14,000* |
*Verify the maximum RPM printed on the actual brush before use.
Features
-
4" cup profile for aggressive broad-surface cleaning
-
0.020" stainless steel knotted wire for stiff, concentrated brushing action
- More aggressive than flexible crimped-wire cup brushes
- Stainless steel wire for stainless fabrication and contamination-sensitive applications
- Excellent for rust, scale, weld residue, oxidation, and stubborn buildup
- Broad cup geometry keeps substantial wire contact on the workpiece
-
5/8"-11 threaded arbor for direct spin-on installation
- Published 14,000 RPM maximum rating
- Strong choice for fabrication, welding, maintenance, repair, and surface preparation
Applications & Performance
This knotted cup brush is built for aggressive broad-surface cleaning where flexible crimped wire does not provide enough cutting action.
Common applications include:
- Heavy rust removal
- Scale removal
- Weld residue cleanup
- Oxidation removal
- Removing stubborn deposits
- Cleaning stainless plate
- Cleaning fabricated assemblies
- Weld-area cleanup
- Structural and industrial maintenance
- Surface preparation before coating or repair
- General fabrication and repair work
The knotted wire remains relatively stiff under load, helping the brush maintain aggressive contact while the cup profile spreads that cleaning action across a broad working area.
Use controlled pressure and let the wire tips do the work.
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 iron cross-contamination is important. A stainless brush previously used on carbon steel can pick up ferrous particles and transfer them back to stainless.
Store stainless and carbon steel brushes separately for contamination-sensitive applications.
Machine Compatibility
Use this 4" saucer brush on a compatible angle grinder with a 5/8"-11 spindle, adequate brush capacity and a maximum speed no greater than 12,500 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.
-
Milwaukee® 2880-20 — 4-1/2" / 5" angle grinder; 8,500 RPM.
-
Milwaukee® 2881-20 — 4-1/2" / 5" angle grinder; 8,500 RPM.
Othe 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
- Verify the maximum RPM printed on the actual brush before use.
- Never operate a wire brush above its marked maximum speed.
- Confirm the grinder is designed to safely accommodate a 4" cup brush.
- Make sure the 5/8"-11 threaded arbor is fully seated and secure before operation.
- Verify adequate guard and operating clearance for normal wire flare.
- Inspect the brush before every use and replace it if damaged, excessively worn, loose, or distorted.
- 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 can accelerate wire fatigue and brush wear.
- 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.
