Weiler 98438 Cup Brush 9/16 in Straight Hair 37000 Rpm

Product Description

The WEILER 98438 is a miniature cup brush designed for precision cleaning, deburring, and surface preparation in tight or hard-to-reach areas. It features a straight hair fill with a stiff bristle configuration, a 9/16-inch brush diameter, and a 1/8-inch shank for use in rotary tools, die grinders, and similar small power tools. Rated to 37,000 RPM, it is suited for high-speed finishing passes on metal, wood, and composite surfaces. Machinists, fabricators, maintenance technicians, and trade professionals use this brush for weld prep, rust removal, and light burr cleanup where larger brushes cannot access.

This cup brush is sized for precision rotary tool applications where a small contact diameter and high RPM rating are required. It is commonly used in industrial maintenance, HVAC fabrication shops, and field service situations for cleaning valve seats, pipe ends, small fittings, and machined bores. The 1/4-inch trim length and stiff hair fill provide controlled, consistent contact pressure on the work surface.

Key Features

• 9/16-inch brush diameter for use in confined or small-footprint applications
• Stiff hair fill material for effective deburring and surface cleaning
• 1/8-inch shank diameter compatible with standard rotary tool and die grinder chucks
• Rated to 37,000 maximum RPM for high-speed operation
• 1/4-inch trim length for controlled bristle contact
• Overall length of 2 inches for reach into tight spaces

Compatibility

Designed for use with rotary tools and die grinders accepting a 1/8-inch shank. Suitable for general-purpose deburring and surface preparation across a range of small power tool platforms.

Installation Notes

Installation is performed by inserting the 1/8-inch shank into a compatible rotary tool or die grinder chuck and securing according to the tool manufacturer guidelines. Always verify that the tool RPM rating meets or is below the 37,000 RPM maximum before operation. Wear appropriate eye protection and secure the workpiece before use. Do not exceed the rated maximum RPM, and inspect the brush for wear or damage before each use.