Product Specification
3" X 1/2" X 1/4" SHAFT MOUNTED KNOTTED CUP - CARBON STEEL
When you need the aggressive bite of knotted wire but a threaded angle-grinder cup is too large or too restrictive, the 3" x 1/2" x 1/4" Shaft Mounted Knotted Cup - Carbon Steel gives you a compact, shank-mounted option for focused metal cleaning. Built with 0.020" carbon steel wire, it is designed for localized rust, scale, weld residue, oxidation, and stubborn buildup on steel and other compatible ferrous surfaces.
The knotted cup construction keeps the wire stiff and concentrated under load, giving it more aggressive cleaning action than a flexible crimped brush. Its compact cup geometry makes it especially useful around fabricated parts, brackets, weldments, corners, and confined surface areas where a larger threaded cup brush may be harder to control.
A 1/4" straight shank allows the brush to mount in compatible rotary tools, drills, and other chuck- or collet-equipped equipment that is approved for this brush size and speed. With a 13,000 RPM maximum rating, it delivers a useful combination of compact access, aggressive knotted-wire cleaning, and broad cup-style contact for fabrication, maintenance, and repair work.
Product Specifications
| Specification |
Details |
| Diameter |
3" |
| Wire Material |
Carbon Steel |
| Wire Diameter |
0.020" |
| Wire Style |
Knotted |
| Brush Type |
Shaft-Mounted Cup Brush |
| Shank |
1/4" Straight |
| Maximum RPM |
13,000 |
Features
-
Aggressive knotted-wire construction for localized heavy-duty cleaning
-
0.020" carbon steel wire attacks rust, scale, weld residue, oxidation, and stubborn buildup
- Compact 3" cup profile provides useful surface contact without the bulk of a large threaded cup brush
- Stiffer and more aggressive than crimped-wire shaft-mounted brushes
-
1/4" straight shank for compatible chuck- and collet-equipped rotary tools
- 13,000 RPM maximum rating
- Useful around fabricated parts, brackets, weldments, corners, and smaller assemblies
- Built for fabrication, maintenance, repair, and general metal preparation
Applications & Performance
This shaft-mounted knotted cup is designed for localized cleaning that needs more aggression than a crimped brush can provide.
Common applications include:
- Rust and corrosion removal
- Weld cleanup
- Scale and oxidation removal
- Removing stubborn surface deposits
- Cleaning fabricated components
- Cleaning brackets and smaller assemblies
- Surface preparation before welding or coating
- Edge and corner cleaning
- Maintenance and repair work
- Localized paint and coating removal on compatible metal surfaces
The knotted wire stays firm during use, helping concentrate cleaning action at the wire tips. The cup shape provides broader contact than a narrow wheel while still remaining compact enough for smaller work areas.
Use controlled pressure and let the wire tips perform the cleaning rather than forcing the brush into the surface.
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
The 1/4" straight shank fits standard three-jaw drill chucks, making this brush a convenient choice for cleaning and surface preparation with compatible corded and cordless drills. It can be secured directly in suitable 3/8" and 1/2" drill chucks without a separate arbor adapter.
Compatible examples include:
-
DEWALT® DWD110 — corded drill with a 3/8" chuck.
-
Milwaukee® 0240-20 — corded drill with a 3/8" chuck.
-
Makita® HP1640 — corded hammer drill with a 1/2" chuck; use rotation-only mode.
-
Bosch® GSR12V-300 — cordless drill/driver with a 3/8" chuck.
-
RYOBI® PCL206 — cordless drill/driver with a 1/2" chuck.
Other machines may be compatible. Confirm secure shank engagement and clearance for the working brush. Other rotary drills or brush-approved collet tools may be suitable when their accessory instructions, capacity and speed match. Do not use hammer or impact action.
Safety Tips
- Never exceed the brush's 13,000 RPM maximum speed.
- Use only with a machine that permits this type and diameter of wire brush.
- Confirm the 1/4" straight shank is fully inserted and securely clamped before operation.
- Use in rotary mode only; do not use with impact-driver operation.
- Inspect the brush before every use and replace it if damaged, excessively worn, loose, or distorted.
- Maintain adequate clearance around the rotating brush and normal wire flare.
- 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 tool to reach operating speed before contacting the workpiece.
- Follow all operating and safety instructions for both the power tool and wire brush.
