3M 7100380474 Flap Disc Type 27 4-1/2 in 40 Grit 10 Pack

Product Description

The 3M 7100380474 is a Cubitron 3 ceramic abrasive flap disc designed for aggressive material removal on all metals. It features a Type 27 flat profile and measures 4-1/2 inches in diameter with a 7/8-inch arbor hole. The ceramic abrasive grain is self-sharpening, meaning it continuously fractures under load to expose fresh cutting edges. This keeps cut rates high and surface temperatures low throughout the disc life. A fiberglass backing plate provides rigid support during grinding, and the abrasive is coated to resist swarf loading — a common cause of premature disc failure and workpiece overheating. Grit is 40, suited for heavy stock removal.

This disc is built for metalworking applications where heat buildup is a concern, including stainless steel, mild steel, aluminum, and other heat-sensitive alloys. The Type 27 depressed-center profile suits flat grinding and moderate angle work on fabrication tables, structural steel, weld prep, and pipe work. It ships in a 10-pack, making it practical for shop stocking and job-site supply. Fabricators, welders, pipefitters, and industrial maintenance techs are the primary installers and end users.

Key Features

• Ceramic grain self-sharpens continuously for sustained cut rate across disc life
• Anti-loading coating prevents swarf buildup, extending usable life and reducing workpiece heat
• Type 27 flat profile for surface grinding and weld blending
• 40 grit for aggressive stock removal on metal
• Fiberglass backing for rigid support at operating RPM
• Packed 10 discs per unit for shop and job-site inventory

Compatibility

Designed for use with 4-1/2-inch angle grinders equipped with a 7/8-inch arbor. Suitable for grinding and material removal on all metals, including heat-sensitive alloys.

Installation Notes

Disc mounting and use should follow ANSI B7.1 and the grinder manufacturer guidelines. Confirm the grinder RPM rating meets or exceeds the disc maximum RPM before mounting. Inspect the disc for damage before each use and never use a cracked or delaminated disc. Wear appropriate PPE including face shield, gloves, and hearing protection during operation.

Technical Specifications

• Disc Type: Type 27
• Diameter: 4-1/2 inches
• Arbor Size: 7/8 inches
• Abrasive Material: Ceramic
• Grit: 40
• Backing Material: Fiberglass
• Pack Quantity: 10
• Weight: 2.441 pounds

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100380474