3M 7100098230 Psa Disc 120 Grit 6 in Ceramic 100 Pack

Product Description

The 3M 7100098230 is a pressure-sensitive adhesive (PSA) abrasive disc designed for use with disc sanders in metalworking, woodworking, and surface preparation applications. Part of the 3M 321U Series, this disc features a ceramic aluminum oxide abrasive grain on a C-weight paper backing, delivering consistent cut and durability through aggressive sanding tasks. At 120 grit, it falls in the fine grade range, making it suitable for finishing passes, light material removal, and surface blending. Each pack contains 100 discs. The disc measures 6 inches in diameter with no vacuum holes, and the blue-colored backing aids in easy identification on the job.

This disc is engineered for use with disc sanders across a range of production and maintenance environments. The 321U Series is a common choice in fabrication shops, HVAC sheet metal work, and general industrial surface prep where repeatable finish quality is required. The PSA backing allows for fast disc changes on compatible platens without the need for hook-and-loop fasteners. At 120 grit, this disc handles final smoothing after coarser stock removal stages, bridging the gap between aggressive grinding and fine finishing work.

Key Features

• Ceramic aluminum oxide abrasive grain for long-lasting cut performance
• 120 grit fine grade for finish sanding and surface blending
• C-weight paper backing provides flexibility with moderate stiffness
• Pressure-sensitive adhesive backing for quick, secure platen attachment
• No vacuum holes — suited for solid platen disc sanders
• 100 discs per pack for extended production use

Compatibility

Designed for use with disc sanders compatible with 6-inch PSA abrasive discs and solid (non-vacuum) platens. Part of the 3M 321U Series.

Installation Notes

Ensure the sander platen surface is clean and free of adhesive residue before applying a new disc, as contamination reduces bond strength and disc life. Peel the liner from the PSA backing and apply the disc firmly to the platen, pressing from the center outward to eliminate air pockets. Always power down and disconnect the sander before changing discs. Operate within the disc speed rating specified by the machine manufacturer.