3M 7100090978 Hook Loop Disc 180 Grit 5 in 50 Pack

Product Description

The 3M 7100090978 is a hook and loop abrasive disc designed for demanding surface preparation and finishing work. Part of the 3M 321U series, this disc features a ceramic aluminum oxide abrasive on a C-weight paper backing, delivering consistent cut and durability across a range of substrate types. At 180 grit, it is well-suited for fine scratch removal, surface blending, and prep before topcoat application. The 5-inch diameter fits standard hook and loop random orbital and disc sanders used in professional shops. Installation and removal are tool-free, making disc changes fast during production work.

This disc is suited for collision repair environments, commercial and specialty vehicle finishing, and marine surface preparation. The ceramic aluminum oxide abrasive extends disc life compared to conventional aluminum oxide, making it a practical choice for high-volume sanding operations. The blue-colored disc provides quick visual identification on the shop floor. Sold in a pack of 50, this SKU is appropriate for shop supply stocking where consistent abrasive performance is required across multiple workstations or technicians.

Key Features

• 180 grit ceramic aluminum oxide abrasive for fine finishing and surface prep
• C-weight paper backing provides flexibility for contoured surface work
• Hook and loop attachment system allows fast, tool-free disc changes
• 5-inch diameter fits standard hook and loop random orbital sanders
• 321U series construction for consistent cut rate and extended disc life
• Pack of 50 discs supports shop-level stocking and production use

Compatibility

Designed for use in collision repair, commercial and specialty vehicle finishing, and marine surface preparation applications. Fits standard 5-inch hook and loop backing pads on random orbital and disc sanders.

Installation Notes

Attach the disc to a compatible 5-inch hook and loop sanding pad by pressing the disc firmly until fully seated. Inspect the backing pad for worn hooks before each disc change, as a degraded pad reduces holding force during operation. Ensure the sander speed rating is appropriate for the disc diameter before use. Worn or loaded discs should be replaced promptly to avoid heat buildup and surface damage.