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Flap Discs

Flap discs for angle grinders — zirconium abrasive layered on a backing plate, used for grinding, blending welds, and removing surface coatings on steel. The overlapping flaps wear progressively, exposing fresh grit as you work. Match disc diameter to your grinder, grit to the job: coarse (40-grit) for heavy stock removal, medium (60-grit) for general weld prep, fine (80-grit and up) for finishing and blending.

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Flap discs combine grinding and finishing in one consumable. Each flap is a strip of zirconium-coated cloth bonded to a fibreglass or plastic backing plate. As the outer edge wears, fresh abrasive is exposed — you get consistent cut without switching discs mid-job.

Grit choice: 40-grit cuts fast, leaves deep scratches; use it to grind down welds or strip rust and paint. 60-grit is the workhorse — enough bite for prep work, fine enough that you're not creating extra finishing. 80-grit and 120-grit are for blending welds flush or smoothing surfaces before coating. Running too coarse on thin sheet risks burn-through; too fine on heavy scale just clogs the flaps.

Diameter and bore: 115 mm and 125 mm discs fit most standard angle grinders (check your guard clearance). 100 mm discs suit compact grinders or tight spaces. Bore size must match the grinder spindle — 22 mm is common on larger tools, 16 mm on smaller models. Reducers exist, but a snug fit matters for balance at speed.

Zirconium vs aluminium oxide: Zirconium self-sharpens under heat and pressure, so it stays aggressive longer on steel and stainless. Aluminium oxide is cheaper, works fine on softer metals and wood, but dulls faster on ferrous work. If you're doing production welding or fabrication, zirconium pays back in fewer disc changes.

Check the max RPM stamped on the backing plate and don't exceed your grinder's no-load speed. Worn flaps that expose the backing plate mean it's done — pushing further risks the plate shattering. Keep a few grits on the van; swapping from 40 to 80 saves an extra step with a finishing disc.