Norton 66252839109 Knotted Cup Brush 2-3/4 in Carbon Steel

Product Description

The NORTON 66252839109 is a knotted carbon steel cup brush designed for aggressive surface preparation and weld cleaning on metal workpieces. With a 2-3/4 inch brush diameter and 0.014 inch wire diameter, this single-row configuration delivers focused, high-impact abrading action at up to 14,000 RPM. The threaded 5/8-11 arbor hole mounts directly to standard angle grinders. A 1 inch trim length provides consistent wire contact pressure throughout the life of the brush. Fabricators, welders, and metal finishing technicians reach for this style of brush when stripping mill scale, removing rust, or cleaning weld beads ahead of coating or inspection.

This knotted cup brush suits industrial and light-commercial metalworking environments. Common applications include pre-weld joint cleaning, post-weld spatter and slag removal, surface rust removal on structural steel, and paint or coating stripping on ferrous metals. The knotted wire construction — as opposed to crimped fill — generates higher contact force per wire strand, making it the appropriate choice when the workpiece demands heavier stock removal or when a crimped brush has proven insufficient for the task.

Key Features

• Knotted carbon steel fill for aggressive cutting action on ferrous surfaces
• 2-3/4 inch brush diameter fits standard angle grinder cup brush applications
• 0.014 inch wire diameter balances aggressiveness with wire longevity
• 14,000 maximum RPM rating for use with full-speed angle grinders
• 5/8-11 threaded arbor hole for direct mounting — no adapter required on most grinders
• Single-row configuration for concentrated contact and reduced vibration

Compatibility

Designed to mount on angle grinders 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 used in fabrication and welding trades.

Installation Notes

Installation and operation should be performed by qualified personnel familiar with angle grinder safety. Always power down and unplug or de-energize the grinder before mounting or removing the brush. Verify that the grinder spindle speed does not exceed the 14,000 RPM maximum rating marked on the brush before operation. Wear appropriate PPE including a face shield, gloves, and hearing protection; wire wheel brushes can shed individual wires at high speed.