3M 7000120399 Wheel Adapter 1/4 Inch 1/4-20 Internal Thread

Product Description

The 3M 7000120399 is a wheel adapter designed for use with Type 81 and Type 84 PG grinding wheels. It features a 1/4-inch diameter shank and a 1/4-20 internal thread, allowing it to accept PG wheels with 1/4-20 external threads. Weighing 0.36 pounds, this compact adapter serves as the mechanical interface between the grinding wheel and the tool spindle. It is used by trade professionals and fabricators who require a secure, properly threaded mount when running small-diameter grinding wheels on compatible rotary tools and die grinders.

This adapter is suited for applications involving surface grinding, deburring, and finishing work where Type 81 or Type 84 PG wheels are the specified abrasive. It is appropriate for use in metal fabrication, maintenance, and repair environments where small-diameter mounted wheels are driven by pneumatic or electric rotary tools. The 1/4-inch shank size is a common fit for standard die grinder collets used across industrial and trade settings.

Key Features

• 1/4-inch diameter shank for compatibility with standard die grinder collets
• 1/4-20 internal thread accepts PG wheels with 1/4-20 external threads
• Designed specifically for use with Type 81 and Type 84 PG wheels
• Lightweight at 0.36 pounds for easy handling and tool balance
• Sold individually (each)

Compatibility

Designed for use with Type 81 and Type 84 PG grinding wheels that have 1/4-20 external threads. Fits rotary tools and die grinders with a 1/4-inch collet.

Installation Notes

Installation should be performed by a qualified operator familiar with abrasive wheel mounting procedures. Ensure the rotary tool or die grinder is fully powered off and disconnected from its air or electrical supply before mounting or removing the adapter. Thread the adapter fully onto the wheel spindle and verify the wheel is secured before operating. Follow applicable ANSI B7.1 safety standards for the use, care, and protection of abrasive wheels.

Technical Specifications

• Shank Diameter: 1/4 inch
• Thread Size: 1/4-20 internal
• Compatible Wheel Types: Type 81 and Type 84 PG Wheels
• Weight: 0.36 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 1

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000120399