Weiler 94690 Knotted Steel Cup Brush 3.5 in Angle Grinder

Product Description

The WEILER 94690 is a knotted steel cup brush designed for aggressive surface preparation and weld cleaning on angle grinders. Built with 0.014 inch steel wire in a single-row knotted configuration, it delivers the cutting action needed to remove mill scale, rust, weld spatter, and coatings from metal surfaces. The brush measures 3.5 inches in diameter with a 1.25 inch trim length and is rated to a maximum of 9,000 RPM. The 5/8-11 threaded arbor hole provides direct mounting to standard angle grinders without an adapter. Metal fabricators, welders, pipefitters, and ironworkers rely on this style of brush for fast, consistent surface prep before welding, painting, or coating application.

The WEILER 94690 is suited for use on structural steel, carbon steel pipe, plate, and fabricated assemblies. It handles both shop and field applications where heavier wire action is required to cut through oxidation and surface contamination. The knotted wire fill resists splaying under load, maintaining contact pressure across the work surface. Single-row construction concentrates the wire strands for focused stock removal in tight weld joints and corner profiles.

Key Features

• Knotted wire fill for aggressive cutting action and reduced wire flare
• 0.014 inch steel wire diameter for effective rust, scale, and spatter removal
• 3.5 inch cup diameter with single-row construction for concentrated contact
• 5/8-11 threaded arbor hole fits standard angle grinder spindles directly
• 1.25 inch trim length balances stiffness and surface coverage
• Rated to 9,000 RPM for compatibility with common angle grinder speeds

Compatibility

Designed to mount directly on angle grinders with a 5/8-11 threaded spindle, which is the standard arbor size on most 4 inch to 5 inch right-angle grinders used in metal fabrication and welding trades.

Installation Notes

Installation should be performed by a qualified tradesperson following the grinder manufacturer's mounting instructions. Ensure the grinder is unplugged or the power source is locked out before threading the brush onto the spindle. Never exceed the 9,000 RPM maximum speed rating marked on the brush. Operators must wear appropriate PPE including a full face shield, gloves, and hearing protection when using wire cup brushes.