Weiler 94699 Knotted Cup Brush 4 Inch Steel Wire

Product Description

The WEILER 94699 is a knotted steel wire cup brush designed for heavy-duty surface preparation and weld cleaning on metal workpieces. It mounts to angle grinders and die grinders via a standard 5/8-11 threaded arbor, making it a common tool in fabrication, maintenance, and industrial cleaning applications. The brush measures 4 inches in diameter with a 0.023 inch wire diameter and a 1-1/4 inch trim length. The knotted wire construction delivers aggressive cutting action, removing rust, scale, weld slag, and old coatings faster than crimped alternatives. Maximum rated speed is 10,200 RPM. Sold individually.

This cup brush is suited for use in metal fabrication shops, structural steel work, pipeline maintenance, and general industrial settings. It performs well on tasks such as pre-weld joint cleaning, post-weld spatter removal, and surface descaling before coating or painting. The single-row knotted configuration concentrates wire pressure at the contact zone, making it effective on edges, corners, and weld beads where flat brushes have limited reach. Licensed tradespeople including pipefitters, ironworkers, and maintenance mechanics commonly use this type of brush in daily workflow.

Key Features

• Knotted wire construction for aggressive material removal and extended brush life
• 4 inch diameter with 0.023 inch wire diameter for concentrated cutting action
• 1-1/4 inch trim length provides flexibility and consistent contact on uneven surfaces
• 5/8-11 threaded arbor hole fits standard angle grinder spindles
• Single-row configuration focuses wire pressure for edge and weld bead work
• 10,200 RPM maximum rated speed compatible with most 4-inch angle grinders

Compatibility

Designed for use with angle grinders and grinder accessories equipped with a 5/8-11 threaded spindle, which is the standard arbor size on most 4-inch and 4-1/2 inch angle grinders.

Installation Notes

Installation and operation should be performed by qualified personnel familiar with angle grinder safety practices. Always confirm the grinder's rated no-load RPM does not exceed the brush's 10,200 RPM maximum before mounting. Power down and disconnect the grinder from its power source before installing or removing the brush. Always wear appropriate face, eye, and hand protection when operating wire brushes, and never exceed the rated RPM marked on the brush.