3M 7000000389 Quick-change Disc 120 Grit 3 in Roloc Tr

Product Description

The 3M 7000000389 is a quick-change abrasive disc designed for use with Roloc TR (Type R) attaching systems on pneumatic and electric angle grinders and die grinders. Part of the 3M 361F Series, this disc uses aluminum oxide abrasive grain on a polyester cloth backing rated YF weight, delivering consistent cut and durability across a range of surface preparation tasks. At 120 grit, it falls in the fine grade range, suited for finishing, light material removal, blending, and deburring on metal surfaces. The disc is rated to 20,000 RPM and measures 3 inches in diameter. Installation and removal are tool-free via the Roloc TR twist-lock button system.

This disc is commonly used in metal fabrication, HVAC ductwork prep, plumbing rough-in, and general mechanical service environments where consistent surface finishing is required. The 3-inch diameter and fine grit make it well suited for working in tighter areas on pipe ends, fittings, brackets, and sheet metal. It is sold individually but requires a minimum order of 50 units per order. Installers in HVAC, plumbing, and mechanical trades reach for discs like this for deburring cut tubing, cleaning weld areas, and smoothing rough edges before assembly.

Key Features

• Roloc TR (Type R) quick-change attachment — tool-free disc swap on compatible mandrels
• 120 grit aluminum oxide abrasive — fine grade for finishing, blending, and deburring
• YF-weight polyester cloth backing for flexibility and durability under load
• 3 inches disc diameter for maneuverability in confined workspaces
• Rated to 20,000 RPM for use with standard pneumatic and electric rotary tools
• 3M 361F Series construction with brown disc face and white Roloc button

Compatibility

Designed for use with Roloc TR (Type R) quick-change mandrels and holders. Verify that your grinder or die grinder mandrel is rated for the Type R attaching system before use.

Installation Notes

Installation requires a compatible Roloc TR mandrel mounted in a pneumatic or electric rotary tool. Confirm the tool's free speed does not exceed 20,000 RPM before mounting the disc. Inspect the disc for damage before each use and do not use a disc that shows tears, delamination, or missing abrasive. Follow ANSI B7.1 and applicable shop safety protocols, including eye and face protection, when operating abrasive discs.