3M 7100199653 Abrasive Disc 5 in 400 Grit Ceramic Ao 321U

Product Description

The 3M 7100199653 is a 5-inch Hookit abrasive disc in the 321U series, engineered for paint prep and body repair sanding applications. The disc uses a blended mineral system combining aluminum oxide and ceramic grain, which delivers consistent cut and extended service life compared to single-mineral abrasive products. At 400 grit, this disc is suited for fine finishing and surface preparation stages. An anti-loading coating keeps the cutting surface clear of dust and debris, maintaining abrasive performance throughout the disc life. Sold in box quantities, it is intended for use by automotive body technicians and professional refinishers working in production or collision repair environments.

This disc is designed for use on automotive body panels during paint preparation, primer sanding, and surface refinement. The multi-hole pattern is engineered to align with most backup pads and connect with dust extraction systems, reducing airborne particulate at the work surface. The Hookit attachment system allows for fast disc changes without tools, supporting efficient workflow in high-volume refinishing shops and collision centers. It is appropriate for use on painted surfaces, primers, and body fillers at the finish sanding stage.

Key Features

• Blended ceramic and aluminum oxide mineral abrasive for balanced cut and finish performance
• 400 grit rating suited for fine paint prep and finish sanding stages
• Anti-loading coating resists clogging from dust and sanding debris
• Multi-hole pattern supports dust extraction and aligns with standard backup pads
• Hookit attachment system enables fast, tool-free disc changes
• Upgraded resin bond improves disc durability over the course of use

Compatibility

Designed for use with Hookit-compatible backup pads in 5-inch diameter configurations; multi-hole pattern aligns with most standard dust-extraction backup pads used in automotive refinishing applications.

Installation Notes

Automotive body technicians and professional refinishers install and replace these discs. Ensure the backup pad surface is clean and free of debris before attaching a new disc to maintain proper seating. Verify the backup pad diameter and hole pattern match before use. Operate the sander at the speed recommended for the backup pad and disc combination to avoid premature wear or disc separation.

Technical Specifications

• Disc Diameter: 5 inches
• Grit: 400
• Abrasive Mineral: Ceramic and Aluminum Oxide blend
• Attachment Type: Hookit
• Hole Pattern: Multi-hole
• Package Weight: 2.963 pounds
• Package Length: 13.8 inches
• Package Width: 5.9 inches
• Package Height: 6.3 inches
• Unit of Measure: Box
• Minimum Order Quantity: 4

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100199653