3M 7000121171 High Strength Flap Brush 4.5x4in 7A Medium

Product Description

The 3M 7000121171 is a high-strength nonwoven radial flap brush engineered for consistent surface finishing across all metal types. Measuring 4.5 inches in diameter by 4 inches in width with a 5/8-11 thread mount, this brush delivers a 7A medium cut rate suited to blending, deburring, and final finish work on ferrous and nonferrous metals. Rows of nonwoven abrasive material are arranged in a radial flap configuration, which provides conformability to contoured or irregular surfaces while maintaining a controlled, repeatable finish. Licensed metalworkers, fabricators, and finishing technicians install this brush for production and job-site metal prep applications.

This flap brush is intended for use on all metal substrates including steel, aluminum, and stainless steel. It is designed for use with compatible inline sanders, including the 3M 1HP Inline Sander line, making it a practical choice for shops and field crews that require quick changeovers and consistent results across high-volume finishing passes. The four-way keyway attachment system supports rapid mounting and removal without specialty tooling, reducing downtime during abrasive changes.

Key Features

• Radial flap construction with high-strength nonwoven abrasive rows for conformability on contoured metal surfaces
• 7A medium grade cut rate suited for blending, deburring, and pre-finish work on all metals
• 4.5-inch diameter by 4-inch width with 5/8-11 threaded arbor mount
• Four-way keyway attachment for fast, tool-free changeover on compatible inline sanders
• Compatible with the 3M 1HP Inline Sander line for integrated finishing workflows

Compatibility

Designed for use with the 3M 1HP Inline Sander line. The 5/8-11 threaded arbor mount is a standard fitting for compatible right-angle and inline pneumatic grinders that accept this thread specification.

Installation Notes

Installation should be performed by a qualified metalworking or finishing technician following the tool manufacturer's guidelines. Ensure the sander or grinder is fully depressurized and powered off before mounting or removing the flap brush. Verify that the tool spindle speed rating meets or exceeds the maximum rated speed marked on the brush before operation. Always wear appropriate PPE including eye protection and gloves when working with rotary abrasives.

Technical Specifications

• Diameter: 4.5 inches
• Width: 4 inches
• Arbor Size: 5/8-11
• Grade: 7A Medium
• Weight: 1.06 pounds
• UPC: 00051141557502
• Sold As: Each

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000121171