3M Company FLPDISC4.5IN40 Flap Disc 4.5 in 40 Grit

Product Description

The 3M COMPANY FLPDISC4.5IN40 is a 4.5-inch, 40-grit flap disc built for heavy-duty material removal across a wide range of coatings and surfaces. This disc uses a Hookit-backed design, allowing it to attach and release quickly on compatible random orbital sanders. The 40-grit abrasive cuts aggressively, making it well suited for stripping paint, rust, weld spatter, and surface scale. Trades that work with metal fabrication, surface prep, or structural coatings will find this disc a practical fit for high-volume removal tasks. Each package contains 12 discs sold as individual units (EA).

This flap disc is designed for use with random orbital sanders that accept Hookit-compatible backings. It handles all-purpose surface preparation on metal, wood, and coated substrates. Common applications include weld prep, paint stripping, rust removal, and general surface conditioning in both shop and field environments. The 40-grit designation makes it most appropriate for aggressive stock removal rather than finishing work. Fabricators, ironworkers, pipefitters, and general contractors regularly use discs of this type as part of routine surface prep workflows.

Key Features

• 4.5-inch diameter fits standard random orbital sanders with Hookit-compatible backing
• 40-grit abrasive for aggressive, heavy-duty material removal
• Hookit backing enables fast disc attachment and release
• All-purpose design works on multiple coatings and surface types
• Sold in a 12-pack (unit of measure: EA) for job-site or shop use

Compatibility

Designed for use with random orbital sanders that accept Hookit-backed 4.5-inch flap discs. Suitable for all coatings and surfaces per manufacturer specification.

Installation Notes

Flap discs of this type are installed and replaced by fabricators, ironworkers, or other trades performing surface prep work. Before changing a disc, power down the sander and disconnect it from its power source. Ensure the disc is fully seated and the Hookit backing is fully engaged before operating. Follow all applicable OSHA and tool manufacturer guidelines for abrasive disc use, including proper RPM ratings and eye and face protection requirements.

Technical Specifications

• Diameter: 4.5 inches
• Grit: 40
• Backing Type: Hookit
• Package Quantity: 12
• Unit of Measure: EA
• Weight: 2.88 pounds

Standard Information

• Brand: 3M COMPANY
• Manufacturer Part Number: FLPDISC4.5IN40