3M 7100109866 Flap Disc 40 Grit 4.5 Inch Type 27

Product Description

The 3M 7100109866 is a Type 27 flap disc engineered for medium to high-pressure grinding tasks including beveling, weld removal, and edge deburring on metal surfaces. Built with 3M Precision-Shaped Grain bonded to a durable polyester backing, this 4.5-inch disc delivers a fast, consistent cut throughout its service life. The shaped abrasive grain maintains cutting efficiency as individual flaps wear down, continuously exposing fresh mineral. Designed for use with right-angle grinders, it provides a notably smoother finish compared to fiber discs and bonded grinding wheels, making it a practical choice when surface appearance matters alongside material removal rate.

This flap disc is suited for fabrication, welding, and metal finishing work in both shop and field environments. It performs well on a variety of metals including mild steel, stainless steel, and aluminum where aggressive stock removal combined with a controlled finish is required. The 40-grit designation makes it appropriate for initial weld blending, heavy deburring, and edge chamfering. The polyester backing resists flex fatigue under sustained high-pressure operation, extending disc life in demanding production or maintenance settings. Licensed tradespeople and fabricators working in structural, mechanical, or industrial environments will find this disc compatible with standard 4.5-inch right-angle grinder tooling.

Key Features

• 40-grit 3M Precision-Shaped Grain for aggressive, fast material removal on metal
• Durable polyester backing withstands high unit pressure without delaminating
• Individual flap breakdown continuously exposes fresh abrasive mineral for consistent cut rate
• Type 27 flat profile reduces gouging risk compared to fiber discs and bonded wheels
• Suitable for applications where surface finish quality is a secondary requirement alongside metal removal
• 4.5-inch diameter fits standard right-angle grinders

Compatibility

Designed for use with standard 4.5-inch right-angle grinders accepting Type 27 flap disc arbors. Suitable for grinding and finishing operations on a variety of metal workpieces.

Installation Notes

Installation and disc changes must be performed with the grinder unplugged or the power source isolated. Verify the grinder's maximum RPM rating meets or exceeds the disc's rated speed before mounting. Inspect the disc for damage before each use and discard any disc showing torn flaps, delamination, or backing damage. Follow applicable ANSI B7.1 and OSHA grinding safety guidelines, including the use of appropriate eye and face protection.

Technical Specifications

• Disc Diameter: 4.5 inches
• Grit: 40
• Disc Type: Type 27 (Right Angle)
• Backing Material: Polyester
• Abrasive Grain: 3M Precision-Shaped Grain
• Weight: 5.85 pounds
• Package Length: 11.9 inches
• Package Width: 8.4 inches
• Package Height: 9 inches
• Sold As: Each
• Minimum Order Quantity: 10
• UPC: 051125872589

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100109866