3M Unitized Wheel Mandrel 990, 1-3/4 in x 1/4 in x 1 in

The 3M Unitized Wheel Mandrel 990 is a heavy-duty steel attachment accessory designed to secure small-diameter Scotch-Brite Unitized Wheels or stacked Radial Bristle Discs to high-speed rotary power tools.

It functions as a mechanical adapter, allowing standard die grinders to carry specialized deburring, finishing, and edge-blending abrasives into tight spaces.

Key Performance & Design Features

• Rigid Dual-Flange Stability: The assembly includes two precision-machined steel flanges that sandwich the abrasive wheel on either side. Secured tightly by a low-profile retainer nut, it prevents the wheel from warping, slipping, or vibrating under heavy lateral load.
• Compact, High-Access Geometry: With an overall length of 1-3/4 inches, this mandrel keeps the abrasive closer to the tool’s spindle nose. This tight clearance reduces rotational runoff and gives operators maximum control when blending intricate contours, internal bores, or narrow channels.
• High-Speed Engineering: Engineered from solid steel to withstand intense production environments, it is rated for maximum rotational speeds up to 25,100 RPM (though the actual operational speed should always match the maximum RPM threshold marked on the specific abrasive wheel being used).
• Corrosion protected with thread and shaft machined to industrial standards

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