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3M Flap Disc 577F, T29, Alumina Zirconia, Dry/Wet, 7" Diameter, 80 Grit, 111/128" Center Hole Diameter (Pack of 1)

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Product Specifications
Part Number
Grit Type
Color Name
Fastening Type
Round Hole
Item Size
7.7 x 7.7 x 6.2 inches
Manufacturer Series Number
Max Rotational Speed
8600  RPM
Number of Items
Outside Diameter
7  inches
Specification for this product family (See all  products)
Manufacturer Grade
Construction Type
Grit Material Type
Zirconia Alumina
Brand Name
Warning Message

This product is intended for professional/commercial use.

When you check out, you will be asked to verify that you are a professional/commercial user. Please review the safety information and legal disclaimer for this product.

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Key Features

  • Alumina Zirconia mineral provides more cutting power than aluminum oxide across all metal types
  • Flaps combine grinding and blending into one step for time savings
  • Durable Y-weight polyester-backed flaps provide longer life on high-pressure applications such as sharp-edge work and beveling
  • Grinding aid provides cooler running for use on all types of metal
  • Angled, Type 29 disc provides aggressive stock removal and fast cutting on both flat and curved surfaces

Package Details

Shipping Weight: 0.45 pounds
Package Size: 7 x 7 x 0.5 inches

Product Description

3M flap disc 577F is a versatile product that delivers a fast cut, long life and a smooth finish. Performance and price make these discs a great value and the flap design allows one disc to perform both the grinding and blending steps. The economic alumina zirconia mineral is ideal for lowering abrasive costs on both mild and stainless steel applications. Can grind and blend in a single step. Good for sharp edge work and flat finishing. Grinding aid for cooler running. Type 27. For aggressive stock removal on a variety of welds, coatings and other metal fabrication applications. The overlapping coated abrasive cloth flaps on flap discs provide several layers of abrasives, making the disc very durable. High pressure grinding, deburring, edge work and beveling. Center hole diameter: 111/128". Coat type: closed coat. Color: green. Converted form: flap disc. Diameter: 7". Equipment - machines: right angle grinders. Form type: type 29. Grade: 80. Max rpm: 8600. Max speed: 80 meter per second. Position: better.

From the Manufacturer

The 3M™ Flap Disc 577F Type 29 disc combines grinding and blending into a single step to tackle aggressive stock removal on a variety of welds, coatings, and other metal fabrication applications and at the same time produce a blended finish on the workpiece, offering labor cost savings on heavy-duty jobs. The 577F abrasive flap disc features fast-cutting alumina zirconia mineral on durable polyester-backed flaps for extra cutting power, and long life on heavy duty applications such as weld removal, sharp-edge work, and beveling. A grinding aid reduces grinding temperatures for processes involving heat-sensitive alloys such as stainless steel, nickel alloys, and titanium.

Ideal for tough grinding applications where final finish is important, the overlapping layers of the flaps continually wear away with use to expose fresh abrasive mineral for a fast, consistent cut, while the cushioning of the flaps creates a blended finish. Flap discs typically generate a finish one grade finer than the disc is graded, reducing finishing steps. Type 29 is angled for aggressive stock removal and fast cutting on both flat and curved surfaces.

Flap discs are used on a right angle grinder. For attachment, 4-1/2 inch flap discs with a center hole require a flap disc adapter nut, and the 7 inch discs require a flap disc holder (both sold separately). Flap discs with a 4 1/2 inch diameter have a max RPM of 13,300, and the 7 inch discs have a max RPM of 8,600.

Flap discs are three-dimensional grinding discs with overlapping layers of abrasive-coated, fiber-reinforced flaps that fan out from a central hub. These flaps continually wear away with use to expose fresh abrasive mineral for a fast, consistent cut. The one-step alternative to bonded wheels and fiber discs, flap discs grind and finish in a single step, making them a time and cost-saving solution in many typical applications. Under normal conditions, flap discs will generate a finish that is one grade finer than the finish of a fibre disc of the same grade. And, because their overlapping construction allows more abrasive material to be loaded onto the cutting surface, they far outlast typical discs. Flap discs have the flexibility to easily follow curves and contours while delivering less gouging and enhancing operator comfort. They are ideal for a wide range of applications, including weld grinding, deburring, rust removal, edge grinding, and weld seam blending.

For more than a century, 3M has applied innovation and technology to improving our customers’ lives and supporting their business goals. Today the company, from its headquarters in St. Paul, Minnesota, serves industrial and commercial customers and consumers in nearly 200 countries. Abrasive Systems products, including a complete line of coated abrasives, microfinishing and microreplicated abrasives, and hardware accessories, provide the finishing touch for almost any surface conditioning application. The 3M brand, across thousands of products, represents consistency, superior quality, and value.

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Important Information

Legal Disclaimer

3M packages and labels its industrial/commercial products for purchase and use by industrial, professional, and commercial customers. Unless specifically stated on the product package or applicable product literature, 3M industrial products are not packaged, labeled, or intended for sale to individual consumers (ie., the general public).

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