3M 7100091239 Hook Loop Disc 400 Grit 5 in 50 Pack

Product Description

The 3M 7100091239 is a hook-and-loop abrasive disc designed for fine-finish sanding in demanding trade and professional environments. At 400 grit, this ceramic aluminum oxide disc is suited for final surface prep, featheredging, and finish-coat sanding where a smooth, uniform scratch pattern is required. The coated construction uses a C-weight paper backing, which balances flexibility and durability for both flat and slightly contoured surfaces. Discs are sold in a package of 50, making them practical for shop environments with consistent throughput. Installation is tool-free — the hook-and-loop attachment system mounts directly to compatible backing pads without adhesives.

This disc is used in collision repair, commercial and specialty vehicle refinishing, and marine surface preparation. The 400-grit ceramic aluminum oxide formulation is appropriate for sanding between sealer and topcoat stages, scuffing gel coat, or preparing metal and composite substrates ahead of primer. The blue disc color aids in visual identification on the shop floor. The 5-inch diameter fits standard 5-inch hook-and-loop random orbital and dual-action sanders commonly used in body shop and marine finishing applications.

Key Features

• 400 grit ceramic aluminum oxide abrasive for fine-finish surface preparation
• Hook-and-loop backing for fast, tool-free disc changes on compatible pads
• C-weight paper backing provides flexibility for flat and contoured work surfaces
• 5-inch diameter fits standard random orbital and dual-action sanders
• Designed for use in collision repair, commercial vehicle, and marine applications
• Packaged 50 discs per unit for high-volume shop use

Compatibility

Designed for use in collision repair, commercial and specialty vehicle, and marine finishing applications. Compatible with 5-inch hook-and-loop backing pads on random orbital and dual-action sanders.

Installation Notes

Attach the disc to a clean, dry 5-inch hook-and-loop backing pad before powering on the sander. Inspect the backing pad hooks for wear before each use — a worn pad reduces disc retention and can cause disc separation during operation. Ensure the sander is powered off and disconnected before changing discs. Dispose of worn discs and do not reuse discs that show signs of loading, tearing, or delamination.