3M 7100091098 Hookita 321U 6 Inch 400 Grit Abrasive Disc

Product Description

The 3M 7100091098 Hookita 321U is a 6-inch hook-and-loop abrasive disc designed for automotive paint prep and body repair work. The disc uses an aluminum oxide mineral abrasive blended with ceramic grain to deliver consistent cutting action across multiple sanding stages. A multi-hole pattern supports dust extraction through most backup pad configurations, reducing airborne debris at the work surface. An anti-loading coating keeps the cutting face clear of paint dust and sanding residue, extending disc life. Upgraded resin bonding adds durability through the full service life of the disc. At 400 grit, this disc is suited for fine preparation work ahead of primer or topcoat application.

This disc is intended for automotive refinishing and collision repair environments. It fits into the paint preparation workflow from surface leveling through fine scuffing, and is appropriate for use on body panels, fillers, and primer coats. The Hookita hook-and-loop attachment system allows fast disc changes without tools, which reduces downtime during production sanding operations. Professional auto body technicians and detail-oriented refinishing shops are the primary users of this disc.

Key Features

• Aluminum oxide and ceramic grain blend for balanced cutting performance across paint prep stages
• Multi-hole disc pattern aligns with most backup pads for effective dust extraction
• Anti-loading coating reduces clogging and extends usable disc life
• Hookita hook-and-loop attachment allows fast, tool-free disc changes
• Upgraded resin construction improves durability and finish consistency
• 400 grit rating suited for fine surface preparation before primer or topcoat

Compatibility

Designed for use with Hookita-compatible backup pads on standard 6-inch random orbital and orbital sanders used in automotive refinishing applications.

Installation Notes

Installation of abrasive discs should be performed with the sander powered off and disconnected from its air or electrical supply. Confirm the backup pad is clean and free of debris before attaching the disc to ensure full hook-and-loop engagement. Inspect the disc before each use and discard if torn, worn through, or loaded beyond effective cutting. Follow shop ventilation requirements and applicable respiratory protection guidelines when sanding automotive coatings.

Technical Specifications

• Disc Diameter: 6 inches
• Grit: 400
• Abrasive Mineral: Aluminum oxide and ceramic grain blend
• Attachment Type: Hookita hook-and-loop
• Hole Pattern: Multi-hole
• Package Dimensions: 9.2 inches x 6.9 inches x 7.3 inches
• Package Weight: 3.431 pounds
• Unit of Measure: Box
• Minimum Order Quantity: 4

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100091098