3M 7100199423 Hookita 321U Disc 6 Inch 400 Grit

Product Description

The 3M 7100199423 is a Hookita 321U abrasive disc designed for automotive paint preparation and body repair work. It uses a blended mineral system that combines aluminum oxide with ceramic grain, giving the disc a broad cutting range across multiple stages of surface prep. The 6-inch diameter disc runs at 400 grit, making it well suited for fine sanding passes before topcoat application. An anti-loading coating keeps the cutting surface clear of dust and debris, extending disc life between changes. The Hookita hook-and-loop attachment system allows fast disc swaps without tools. Automotive body technicians and paint prep specialists are the primary users of this product.

This disc is used in automotive refinishing and collision repair environments where consistent scratch patterns and controlled material removal are required. The multi-hole pattern is engineered to align with most standard backup pads and supports dust extraction when used with a compatible vacuum system. It is appropriate for both spot repair and full-panel sanding on automotive body surfaces. The 400-grit rating positions it for intermediate to fine finishing steps in the paint prep sequence, typically following heavier cut stages and preceding sealer or primer topcoats.

Key Features

• Blended ceramic and aluminum oxide mineral abrasive for balanced cutting performance
• 400 grit rating suited for intermediate to fine paint prep passes
• Anti-loading coating reduces clogging and extends usable disc life
• Multi-hole pattern supports dust extraction and aligns with most standard backup pads
• Hookita hook-and-loop attachment for tool-free disc changes
• Upgraded resin bond improves durability and finish consistency

Compatibility

Designed for use with Hookita-compatible backup pads commonly used in automotive body and paint preparation applications. Multi-hole pattern aligns with most standard random orbital and rotary backup pads equipped for dust extraction.

Installation Notes

Installation and disc changes are performed by automotive body technicians using a compatible Hookita backup pad mounted to a random orbital or rotary sander. Confirm the sander and backup pad are rated for the disc diameter before use. Power down the tool completely before attaching or removing the disc. Follow shop safety protocols for dust management, including use of extraction equipment or an appropriate respirator.

Technical Specifications

• Disc Diameter: 6 inches
• Grit: 400
• Abrasive Mineral: Ceramic Aluminum Oxide blend
• Attachment Type: Hookita hook-and-loop
• Hole Pattern: Multi-hole
• Package Weight: 4.67 pounds
• Package Length: 13.8 inches
• Package Width: 6.9 inches
• Package Height: 7.3 inches
• Unit of Measure: Box
• Minimum Order Quantity: 4

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100199423