Norton 66252839121 Cup Brush 4in Carbon Steel Crimped

Product Description

The NORTON 66252839121 is a crimped carbon steel cup brush designed for surface preparation, weld cleaning, and rust or scale removal on metal workpieces. The 4-inch diameter brush uses 0.014-inch crimped carbon steel wire, which flexes under load to maintain consistent contact across irregular surfaces. A 5/8-11 threaded arbor mounts directly to angle grinders and bench grinders equipped with a compatible spindle. Rated at 9,000 maximum RPM, this brush suits high-speed material removal tasks performed by metalworkers, fabricators, maintenance technicians, and pipefitters.

This cup brush is suited for use on structural steel, pipe welds, cast iron, and fabricated assemblies requiring surface cleaning before coating, inspection, or further fabrication. The crimped wire fill provides a moderate aggressiveness level, making it appropriate for general deburring, paint stripping, and light oxide removal without the aggressive bite of a knotted wire configuration. It is sold individually and fits standard grinder applications common in industrial maintenance and field fabrication environments.

Key Features

• 4-inch brush diameter provides a wide contact area for efficient surface coverage
• 0.014-inch crimped carbon steel wire flexes to follow surface contours
• 5/8-11 threaded arbor hole for direct mounting on compatible angle grinders
• 1-1/8-inch trim length supports consistent wire deflection and brush life
• 9,000 maximum RPM rating for use on standard high-speed grinders

Compatibility

Designed as an OEM-style replacement cup brush for angle grinders and bench grinders fitted with a 5/8-11 threaded spindle arbor.

Installation Notes

Installation should be performed by a qualified metalworker or maintenance technician. Disconnect and de-energize the grinder before mounting or removing the brush. Thread the brush onto the 5/8-11 spindle by hand and secure according to the grinder manufacturer's torque guidance. Always confirm the grinder's rated no-load RPM does not exceed the 9,000 RPM maximum before operation, and wear appropriate face and eye protection per ANSI B11 and applicable shop safety standards.