3M 7000120408 Disc Pad Hub 2.5 in 5/8-11 Internal Thread

Product Description

The 3M 7000120408 is a disc pad hub designed to anchor color-coded soft backup plates used with abrasive fibre disc grinding systems. With a 2.5-inch diameter and a 5/8-11 internal thread, this hub provides a secure mechanical connection between an angle grinder spindle and a backup plate. It is compatible with the 3M Fibre Disc GL attachment system, formerly sold under the Grit-Lok attachment system name. The hub weighs 0.33 pounds and is sold individually. Fabricators, metal finishers, and grinding technicians working in industrial or shop environments are the primary installers of this component.

This hub is intended for use with 4.5-inch to 7-inch face plates, making it a versatile fit across a range of disc sizes commonly used in weld blending, surface prep, and stock removal applications. Adapters are available separately for M10-1.25, M10-1.50, and 3/8-24 spindle shafts, extending compatibility to grinders with metric or finer-thread arbors. It is sold as a single unit and is typically used in professional fabrication, metalworking, and maintenance grinding setups.

Key Features

• 5/8-11 internal thread fits standard angle grinder spindles
• 2.5-inch hub diameter supports face plates from 4.5 to 7 inches
• Designed for use with 3M Fibre Disc GL (formerly Grit-Lok) attachment system
• Compatible with color-coded soft backup plates for disc identification
• Adapter-ready for M10-1.25, M10-1.50, and 3/8-24 shafts (adapters sold separately)
• Lightweight at 0.33 pounds for reduced operator fatigue

Compatibility

Designed for use with 3M Fibre Disc GL attachment system (formerly Grit-Lok) and color-coded soft backup plates. Supports face plates from 4.5 to 7 inches. Adapters available separately for M10-1.25, M10-1.50, and 3/8-24 spindle shafts.

Installation Notes

Installation is performed by grinding technicians or fabricators using standard hand tools. Before mounting or removing the hub, ensure the angle grinder is fully powered off and disconnected from the power source. Thread the hub onto the grinder spindle by hand first to confirm proper thread engagement before applying any tool torque. Follow the grinder and backup plate manufacturer guidelines for safe disc speed ratings and maximum RPM compliance.

Technical Specifications

• Hub Diameter: 2.5 inches
• Thread Size: 5/8-11 internal
• Compatible Face Plate Sizes: 4.5 to 7 inches
• Weight: 0.33 pounds
• Unit of Measure: Each
• UPC: 00051144118243

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000120408