4-1/2" X 7/8" Aluminum Oxide Resin Fiber Disc – 25 Pack

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Product Specification

4-1/2" X 7/8" ALUMINUM OXIDE RESIN FIBER DISC – 25 PACK

Benchmark Abrasives 4-1/2" aluminum oxide resin fiber discs deliver dependable cutting performance at an economical price for everyday grinding, blending, deburring, and surface preparation. Aluminum oxide is a versatile general-purpose abrasive that works well across a wide range of shop applications, making these discs an excellent choice when you need reliable performance without stepping up to the cost of a premium zirconia or ceramic grain.

Each disc combines aluminum oxide abrasive with a durable resin bond and heavy-duty vulcanized fiber backing. The rigid fiber backing supports the abrasive under grinding pressure, helping transfer power from the grinder to the workpiece for controlled stock removal. Available from aggressive 16 grit through finer 120 grit, the range lets you tackle everything from heavy material removal and weld leveling to blending and pre-finish surface preparation.

These discs are designed for use on right-angle grinders with a compatible 4-1/2" backing pad. A backing pad is required and sold separately.

Quantity: 25 Discs

Dimensions & Specifications

Product Features

• Economical aluminum oxide abrasive for general-purpose grinding and finishing
• Durable resin bond for strength under grinding pressure
• Heavy-duty vulcanized fiber backing supports controlled stock removal
• Wide grit range for aggressive grinding through finer surface preparation
• Suitable for grinding, weld removal, beveling, deburring, blending, cleaning, and surface preparation
• 7/8" center hole for use with compatible right-angle grinder backing pads
• 25 discs per package

Machines Used On

• Right-angle grinders rated for 4-1/2" accessories
• Angle Grinders rated for 4-1/2" accessories

Backing Pad Required: Use with a compatible 4-1/2" x 5/8"-11 resin fiber disc backing pad. Backing pads are sold separately.

Use only with a grinder, guard, backing pad, and retaining hardware approved for the same disc diameter and attachment. The grinder's rated speed must not exceed the maximum RPM of the lowest-rated component in the system.

Applications

Ideal for general-purpose grinding and surface preparation applications including:

• Weld removal and weld blending
• Stock removal
• Beveling and edge preparation
• Deburring
• Rust and corrosion removal
• Paint and coating removal
• Cleaning and surface preparation
• Blending and smoothing

Materials

Commonly used on:

• Carbon Steel
• Stainless Steel
• Cast Iron
• Aluminum
• Brass
• Bronze
• Copper
• Wood
• Fiberglass
• Plastics and Composites
• Hard Rubber

Tip: Lower grits cut faster but leave a deeper scratch pattern. For a smoother finish, start with the grit needed for material removal and progressively work through finer grits.

Aluminum Oxide vs. Zirconia & Ceramic

Aluminum Oxide

Aluminum Oxide is the economical, versatile choice for routine grinding and general shop work.

Zirconia

Zirconia is the better choice when you need longer life and stronger performance under sustained grinding pressure, particularly for demanding steel applications.

Ceramic

Ceramic is the premium choice for high-production grinding, stainless steel, hard alloys, and applications where productivity and abrasive life are the priority.

Safety Tips & Techniques

• Always use a compatible backing pad specifically designed for resin fiber discs.
• Inspect the disc and backing pad before use. Do not use damaged, cracked, torn, or moisture-compromised discs.
• Never operate the grinder above the maximum RPM marked for the disc or backing pad. The grinder's rated speed must not exceed the lowest accessory rating; follow all tool and accessory instructions.
• Keep the grinder guard properly installed and positioned.

• Use appropriate eye and face protection, hearing protection, gloves, protective clothing, and respiratory protection for the material being worked.

• Keep the grinder moving across the workpiece to help control heat and avoid excessive gouging.
• Store fiber discs in a clean, dry environment to protect the backing from moisture and damage.