Product Specification
4" x 5/8"-11 Knotted Saucer Cup Brush - Carbon Steel
For heavier rust, scale, weld residue, and stubborn buildup around edges, corners, transitions, and broad metal surfaces, the 4" x 5/8"-11 Knotted Saucer Cup Brush - Carbon Steel combines aggressive knotted-wire cleaning with the access advantage of a saucer-shaped profile. Built with 0.015" carbon steel knotted wire, it delivers a stiffer, more concentrated brushing action than the crimped saucer version.
The knotted wire construction resists flexing under load, helping maintain aggressive contact when cleaning tougher surface contamination. At the same time, the saucer-shaped profile changes the working angle compared with a conventional cup brush, allowing better approach into edges, corners, weld transitions, and adjoining surfaces.
A 4" diameter, 5/8"-11 threaded arbor, and 12,500 RPM maximum rating make this a versatile grinder-mounted brush for fabrication, welding, maintenance, repair, and demanding surface preparation. It is a strong choice when you need more aggressive cleaning than a crimped saucer brush without giving up the geometry that makes edges and transitions easier to reach.
Product Specifications
| Specification |
Details |
| Diameter |
4" |
| Wire Material |
Carbon Steel |
| Wire Diameter |
0.015" |
| Wire Style |
Knotted |
| Brush Type |
Saucer Cup Brush |
| Arbor |
5/8"-11 Threaded |
| Maximum RPM |
12,500 |
Features
-
4" saucer-shaped profile provides a different working angle than a standard cup brush
-
0.015" carbon steel knotted wire for stiff, aggressive cleaning
- Saucer geometry improves approach into edges, corners, transitions, and angled surfaces
- More aggressive than crimped-wire saucer brushes
- Strong choice for heavier rust, scale, weld residue, and stubborn buildup
- Useful surface coverage without sacrificing access around adjoining surfaces
-
5/8"-11 threaded arbor for direct spin-on installation
- 12,500 RPM maximum rating
- Built for fabrication, welding, maintenance, repair, and heavy-duty surface preparation
Applications & Performance
The knotted saucer cup brush is built for aggressive surface cleaning with improved access around edges and transitions.
Common applications include:
- Heavy rust removal
- Scale removal
- Weld residue cleanup
- Oxidation removal
- Removing stubborn surface deposits
- Cleaning edges and corners
- Cleaning around weld transitions
- Cleaning fabricated assemblies
- Cleaning angled and adjoining surfaces
- Structural-steel maintenance
- Preparing metal before coating or repair
- General fabrication and maintenance work
The saucer geometry gives the operator a different approach angle than a standard cup brush, while the knotted wire delivers the stiffness needed for more demanding cleaning jobs.
Use controlled pressure and let the wire tips do the work.
Materials
Recommended for cleaning and surface preparation on compatible ferrous materials, including:
- Carbon steel
- Mild steel
- Structural steel
- Cast iron
- Wrought iron
- Other compatible ferrous metal surfaces
Keep carbon steel brushes dedicated to ferrous work when cross-contamination matters. For stainless-steel applications where iron contamination must be minimized, use a dedicated stainless steel wire brush.
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
- Never exceed the brush's 12,500 RPM maximum speed.
- Confirm the grinder is designed to safely accommodate this brush type and diameter.
- Make sure the 5/8"-11 threaded arbor is fully seated and secure before operation.
- Verify adequate guard and operating clearance for the saucer-shaped brush.
- 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.
- Allow the grinder to reach operating speed before contacting the workpiece.
- Follow all operating and safety instructions for both the power tool and wire brush.
