Flap discs are versatile, highperformance abrasive tools consisting of multiple overlapping abrasive flaps (or leaves) radially arranged and bonded to a rigid fiberglass backing plate. Each flap is composed of abrasive grain (aluminum oxide, zirconia alumina, ceramic alumina, or silicon carbide) bonded with resin or resin/cloth combination. The disc is centermounted with a standard arbor hole for use on angle grinders and portable power tools.
Flap discs combine the aggressive material removal of grinding discs with the finishing capability of sanding discs, providing a multistage solution from stock removal to final finish in one tool.
Design Types:
- Flat Type (Type 27): For surface grinding at 0 - 15° angle
- Conical/Depressed Center (Type 29): For contour work at 15 - 25° angle (improved performance at lower pressure)
Typical Applications
Metalworking:
- Weld seam blending and finishing
- Edge deburring and chamfering
- Surface conditioning and cleaning
- Rust and paint removal
- Stainless steel finishing (with appropriate grits)
- Tool and mold polishing
General Fabrication:
- Removing machining marks
- Preparing surfaces for painting or coating
- Composite material finishing
- Wood shaping (with specialty grits)
Selection Guide
| Application | Recommended Grit | Abrasive Type | Disc Type | Notes |
| Heavy Weld Removal | #40 - #60 | Zirconia Alumina | Type 29 | High stock removal |
| Weld Blending/Finishing | #60 - #120 | Zirconia Alumina | Type 27/29 | Balance of removal/finish |
| Stainless Steel Finishing | #80 - #180 | Ceramic Alumina | Type 27 | Minimizes heat discoloration |
| Deburring & Edge Work | #60 - #120 | Aluminum Oxide | Type 29 | Good contour following |
| Paint/Rust Removal | #60 - #80 | Zirconia Alumina | Type 27 | Aggressive cleaning |
| Final Surface Preparation | #120 - #240 | Aluminum Oxide | Type 27 | For painting/coating |
| Non Ferrous Metals | #80 - #180 | Silicon Carbide | Type 27 | Aluminum, copper, brass |
Optimal Operating Technique:
Angle: 5 - 25° relative to workpiece (Type 29: 15 - 25°, Type 27: 0 - 15°)
Pressure: Moderate, consistent pressure (let the disc do the work)
Motion: Use sweeping, even strokes; avoid dwelling in one spot
Work Area: Utilize entire disc surface for even wear
Speed: Maintain consistent grinder speed
| Item No. | Size (mm) | Inch | Grit |
| RW-FD100A50B | 100 × 16 | 4" × 5/8" | 40, 60, 80, 100, 120 |
| RW-FD115A60B | 115 × 22 | 4.5" × 7/8" | 40, 60, 80, 100, 120 |
| RW-FD125A60B | 125 × 22 | 5" × 7/8" | 40, 60, 80, 100, 120 |
| RW-FD150A60B | 150 × 22 | 6" × 7/8" | 40, 60, 80, 100, 120 |
| RW-FD180A60B | 180 × 22 | 7" × 7/8" | 40, 60, 80, 100, 120 |
| Cutting Wheel/Cut Off Wheel | Grinding Wheel/Grinding Disc | Flap Disc |
| Abrasive Cloth | Velcro Disc (Coating Abrasive) |
For further information, you can contact our Sales Engineer, or you can contact us directly or here.