3M 7100199421 Hookita 321U Disc 5 Inch 80 Grit

Product Description

The 3M 7100199421 is a Hookita Blue Abrasive Disc in the 321U series, designed for paint prep and body repair sanding on automotive surfaces. This 5-inch diameter disc uses a blended ceramic and aluminum oxide mineral abrasive at 80 grit, delivering consistent stock removal and finish quality through multiple stages of the repair process. An anti-loading coating helps prevent dust and debris from clogging the cutting surface, extending disc life between changes. Hookita hook-and-loop style attachment allows fast disc swaps without tools. Licensed trade painters and body shop technicians are the primary users of this disc.

This disc is suited for automotive body repair and refinishing applications, including paint stripping, surface leveling, featheredging, and prep work prior to primer or topcoat application. The multi-hole pattern is designed to align with most backup pads and supports dust extraction systems, reducing airborne particulate at the work surface. It is appropriate for use in both production shop environments and single-vehicle repair settings where consistent sanding results are required across a range of substrates.

Key Features

• 5 inch diameter with 80 grit ceramic and aluminum oxide mineral blend for balanced cut and finish
• Anti-loading coating reduces clogging and extends disc service life
• Multi-hole pattern aligns with most backup pads and supports dust extraction
• Hookita hook-and-loop attachment enables fast, tool-free disc changes
• Upgraded resin bond improves disc durability under sustained use
• Suitable for paint prep, featheredging, and surface leveling on automotive body panels

Compatibility

Designed for use with Hookita-compatible backup pads. The multi-hole disc pattern is engineered to align with most standard backup pads used in automotive body and paint applications.

Installation Notes

Install only on a Hookita-compatible backup pad mounted to a random orbital or rotary sander rated for the disc diameter. Confirm the sander is powered off and unplugged before attaching or removing the disc. Follow applicable shop safety guidelines for respiratory protection when sanding painted or primed surfaces. Discard the disc if the abrasive mineral is visibly worn or the backing shows tears.

Technical Specifications

• Disc Diameter: 5 inches
• Grit: 80
• Abrasive Mineral: Ceramic and Aluminum Oxide blend
• Attachment Type: Hookita hook-and-loop
• Hole Pattern: Multi-hole
• Package Weight: 2.963 pounds
• Package Length: 13.8 inches
• Package Width: 5.9 inches
• Package Height: 6.3 inches
• Minimum Order Quantity: 4
• UPC: 051131362531

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100199421