The Zirconia Flap Disc is the volume workhorse of our angle grinder lineup — the grain chemistry behind more daily-use flap discs in metal shops than any other. Self-sharpening zirconia alumina micro-fractures progressively under load, delivering aggressive cut and consistent disc life on carbon steel, structural steel, mild stainless, and dense hardwoods. The signature blue color is industry shorthand for zirconia performance: a clear step up from aluminum oxide in cut rate and life, at a much more accessible price point than ceramic.
72 overlapping zirconia flaps are bonded to a rigid fiberglass plate, with a Type 27 (flat) or Type 29 (10° conical) profile depending on whether you're working flat surfaces or contoured welds. Resin-over-resin bond holds grain through the high pressures and arc-heat of structural fabrication. The flap construction continuously exposes fresh grain as outer flaps wear — predictable cut from start to end of disc life.
Key Features
- Premium zirconia alumina grain — aggressive, self-sharpening, industry standard
- Sweet-spot price-to-performance for daily fabrication work
- 72-flap construction — consistent cut, self-renewing surface
- Rigid fiberglass plate backing — safe at full angle grinder RPM
- Type 27 (flat) and Type 29 (10° conical) profiles available
- Diameters: 4" / 4.5" / 5" / 7" — standard angle grinder fits
- Arbor: 7/8" (22mm) bore or 5/8"-11 thread
- Grit range P36–P120 — heavy stripping through medium blending
Common Applications
- General metal fabrication and shop work
- Structural steel, carbon steel, and pipe grinding
- Weld blending on mild steel and mild stainless
- Edge deburring, beveling, and chamfering
- Hardwood and exotic timber shaping
