3M 7100069138 Wet or Dry Abrasive Disc 320 Grit 5 Inch

Product Description

The 3M 7100069138 is a 5-inch silicon carbide abrasive disc designed for finishing metal surfaces and preparing them for paint. Part of the Wetordry 481W line, this disc uses a fast-cutting silicon carbide mineral that delivers a consistent scratch pattern without requiring heavy manual pressure. The water-resistant polyester backing allows use wet or dry, giving technicians flexibility when working on coated metals, bare metal, or hardwood substrates. It is well suited for production finishing environments where consistent surface prep results are required across repeated cycles.

This disc is intended for use in metal fabrication, automotive refinishing, and general surface preparation applications. It performs on a range of substrates including ferrous and non-ferrous metals and hardwoods. The 320 grit rating makes it appropriate for final-stage sanding passes before primer or topcoat application. At 5 inches in diameter, it fits standard 5-inch disc backing pads common in both shop and field environments. It can serve as an alternative to compound and lubricant-based finishing methods when a dry or water-assisted approach is preferred.

Key Features

• Silicon carbide mineral for fast cutting and consistent scratch pattern
• Water-resistant polyester backing allows wet or dry operation
• 320 grit suitable for final surface prep before paint or primer
• Compatible with a range of substrates including metals and hardwoods
• Reduces need for heavy manual pressure during finishing passes
• Can substitute for compound and lubricant-based finishing methods

Compatibility

Designed as an OEM-style replacement disc for use with standard 5-inch disc backing pads in metalworking, automotive refinishing, and general surface preparation applications.

Installation Notes

Mount disc securely to a compatible 5-inch backing pad before use. Verify backing pad is rated for the intended operating speed. When using wet, ensure the work area and any power tools are rated for wet operation. Inspect disc for tears or delamination before each use and discard if damaged.

Technical Specifications

• Disc Diameter: 5 inches
• Grit: 320
• Abrasive Mineral: Silicon Carbide
• Backing Material: Water-Resistant Polyester Cloth
• Use Type: Wet or Dry
• Package Dimensions: 5.7 x 5.7 x 5.8 inches
• Weight: 0.01 pounds
• UPC: 00051111558393

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7100069138