3M 7100177999 Flap Disc 7 Inch 80 Grit Type 29

Product Description

The 3M 7100177999 is a coated abrasive flap disc engineered for aggressive material removal and surface preparation on metal. Built to Type 29 (T29) geometry with a 7/8 inch arbor hole and 7 inch diameter, it runs at an angled profile that increases contact area and cut rate on flat and contoured surfaces. The disc uses 3M Precision-Shaped Grain, an engineered abrasive that fractures predictably to expose fresh cutting edges throughout the disc life. At 80 grit, it sits in the medium-coarse range, suited for weld grinding, beveling, and pre-paint surface prep where fast stock removal and a reasonably smooth finish are both required.

This disc is intended for use on carbon steel, stainless steel, and other heat-sensitive alloys where conventional aluminum oxide or alumina zirconia discs may overheat the workpiece or wear prematurely. Typical applications include weld seam removal, edge blending, and general surface conditioning in fabrication shops, maintenance environments, and field metalwork. The flap construction allows individual cloth segments to wear away progressively, maintaining a consistent cut rate from first use to the end of disc life rather than degrading sharply as a bonded disc would.

Key Features

• Type 29 angled flap geometry increases surface contact for faster stock removal on flat work
• 3M Precision-Shaped Grain cuts faster and outlasts conventional aluminum oxide and alumina zirconia abrasives
• Progressive flap breakdown exposes fresh mineral continuously, maintaining consistent cut rate throughout disc life
• 80 grit rating suited for weld grinding, beveling, and pre-finishing surface prep
• Compatible with carbon steel, stainless steel, and heat-sensitive alloys
• 7/8 inch arbor fits standard angle grinder spindles

Compatibility

Designed for use with standard angle grinders accepting a 7 inch flap disc with a 7/8 inch arbor. Suitable for metal fabrication and surface preparation applications on carbon steel and stainless steel.

Installation Notes

Flap discs of this diameter are installed and operated by metalworkers and fabricators using angle grinders. Before mounting, confirm the grinder RPM rating meets or exceeds the maximum RPM rating of the disc. Inspect the disc for damage before each use and never operate a damaged or delaminating disc. Always wear appropriate PPE including a face shield, gloves, and hearing protection when operating grinding equipment.

Technical Specifications

• Diameter: 7 inches
• Arbor Size: 7/8 inch
• Grit: 80
• Disc Type: Type 29 (T29) Flap Disc
• Abrasive Type: 3M Precision-Shaped Grain (Coated)
• Compatible Materials: Carbon Steel, Stainless Steel, Heat-Sensitive Alloys
• Package Dimensions: 7.7 x 7.7 x 6.2 inches
• Weight: 2.268 pounds
• Unit of Measure: Each
• UPC: 638060059147

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100177999