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At Engweld, we stock a wide range of flap discs suitable for grinding metal from leading brands such as Klingspor, 3M and Abracs, as well as our own range of RADNOR™ discs which offer excellent value. All of our flap discs are manufactured to the highest EU specifications and come with the OSA seal of approval. They're designed to efficiently remove stock, grind, blend and provide a smooth finish on various materials, from metals like cast iron, aluminium and steel to other materials like stone, plastic and wood.
Available in a range of grit sizes (36, 40, 60, 80 and 120) and grit types, including the popular 60 and 80 grit sizes, you'll be sure to find the ideal flap discs for your project with us. Our range includes zirconium flap discs, ceramic flap discs and other types of flap discs, ready to help you tackle a range of grinding activities. Whether you're engaging in aggressive grinding like grinding stainless steel or light grinding tasks, we have a premium flap disc to meet your needs.
Some of our most popular abrasive products include KLINGSPOR SMT flap discs, which offer an aggressive cut while leaving a pleasing finish, making them one of the best flap discs on offer. Often, one of the SMT discs will take the place of two separate grinding operations - heavy weld removal with a hard grinding disc and then final blending and clean-up with a fibre disc. A built-in fibre-reinforced consumable backing plate eliminates the need for a separate backing pad. Plus you may use your standard angle grinder mounting nut.
Also popular are the RADNOR™ Flap discs, made of alumina-zirconia coated flaps, fastened equally to glass-fibre reinforced resin backing plates or glass fabric backing plates. Zirconia discs are appropriate for most metal grinding applications including the working of welding seams, deburring, de-rusting and cleaning of castings. They are available in sizes from 4-1/2" and grits 40, 60, 80 and one of our best zirconia discs.
On the other hand, Klingspor SMT 624 is a new twist on convex flap discs, utilising a 12° angled backing plate. This enables the disc to be used on more severely curved surfaces like pipes and storage tanks. Available in sizes 4- 1/2", 7" and grits 36, 40, 50, 60, 80, 120.
This comparison highlights the key technical elements of professional flap discs, focusing on the Abrasive Grain Type, which is the single most important factor determining cut rate, lifespan, and heat generation.
The market distinguishes between Zirconia (a good, durable performer) and Precision Shaped Ceramic Grain (the highest performance).
| Feature | RADNOR™ Zirconia Flap Discs | Klingspor SMT 624 Supra | 3M Cubitron™ 967A Flap Discs | 3M Cubitron™ II 967A Flap Discs |
| Abrasive Grain Type | Zirconia Alumina (Zirconium) | Zirconia Alumina (Zirconium) | Precision Shaped Grain (PSG) - First Generation Ceramic | Precision Shaped Grain (PSG II) - Second Generation Ceramic |
| Grain Structure | Blocky, tough, self-sharpening (fractures during use) | Blocky, tough, self-sharpening (fractures during use) | Electro-statically oriented ceramic shapes (triangles) | Micro-replicated triangular ceramic grain (continuously self-sharpening) |
| Performance Level | Professional, High Durability | Professional, High Durability, Aggressive Cut | Premium, High Productivity | Top-Tier, Highest Productivity |
| Stock Removal | Efficient, aggressive removal rate. | Very high aggression, optimized for high-powered grinders. | Extremely fast cut rate. | Fastest cut rate on the market (slices metal). |
| Heat Generation | Moderate | Moderate | Lower (PSG runs cooler than standard Zirconia). | Lowest (Precision shaped grain slices; includes Grinding Aid). |
| Lifespan | Long life, superior to Aluminum Oxide. | High service life. | Very long life, significantly longer than Zirconia. | Longest life, superior consistency. |
| Backing Plate | Glass-fibre reinforced resin or glass fabric. | Glass fibre (Convex 12∘ angle option). | Fibre reinforced. | Heavy Y-weight poly-cotton backing (designed for controlled wear). |
| Ideal Application | General weld seam work, deburring, de-rusting, stainless and mild steel. | Demanding grinding on edges/weld seams on steel and stainless steel, high removal rate. | Medium-duty applications: blending, surface prep, weld and scale removal. | Maximum throughput for medium-duty tasks; ideal for stainless steel (due to cool cutting). |
Working with flap discs requires careful attention to safety. To minimize risks from flying debris, sparks, and noise, proper protective measures are essential. Engweld is committed to providing high-quality, OSA-approved flap discs, but responsible operation is equally important.
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