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Cutting Discs

Cutting discs for angle grinders and cut-off machines, sized from 75mm handheld up to 355mm chop-saw formats. The discs here cover steel, stainless, bar stock, tube, and general fabrication work. Thickness and bore matter — a 1.2mm disc cuts faster and cooler than a 3mm disc but wears quicker; bore diameter must match your arbor or you'll need a reducer ring.

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Disc diameter dictates compatible tool size and maximum cutting depth. A 125mm disc fits a standard 5-inch grinder; 230mm needs a 9-inch machine; 355mm belongs on a bench-mounted chop saw. Check your grinder's arbor — most take 22mm bore, but smaller cordless units and die grinders often need 10mm. Reducer bushings work but add runout if they're loose.

Thickness changes how the disc behaves. A 1.2mm or 1.6mm disc cuts fast with less heat and a narrow kerf, useful for thin-wall tube or when you want to save material. It wears faster and flexes more, so needs a steady hand. A 2.8mm or 3mm disc lasts longer and stays rigid in heavy cuts — better for thick bar or when the grinder's underpowered and you're leaning on it. For repetitive work, thicker discs mean fewer changes; for precision or thin stock, go thinner.

Rated speed must meet or exceed your tool's no-load RPM. A 125mm disc typically maxes out around 12,200 RPM; a 355mm disc runs closer to 3,800 RPM. The rating's stamped on the label — if your grinder spins faster, the disc can shatter. Sealey discs carry EN 12413 certification; check the label matches your material type. Some discs are steel-only, others handle stainless without loading up.

Store discs flat and dry. Edge damage from dropping or moisture weakening the resin bond both lead to breakage under load. If a disc's been sitting in a damp van for two winters, bin it.