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Flat head angle grinders are designed for one specific problem - getting a grinder into spaces a standard body simply won't fit. The low profile head sits closer to the work surface which makes them essential for pipe work, structural steel and tight corner grinding where a conventional tool would foul against the material or surrounding structure.
Disc size matters. Most models in this category run 115mm or 125mm discs. The smaller the disc the easier it is to manoeuvre in confined areas. Check the no-load RPM too - higher RPM suits cutting and grinding hard metals while lower speeds give better control on stainless steel.
For angle grinder use in fabrication or welding prep these tools handle flap discs, cutting wheels and depressed centre grinding discs without issue. Look for a spindle lock for fast disc changes and a tool-free guard adjustment if you're switching tasks regularly.
Motor power in this range typically sits between 500W and 1200W. Heavier stock removal needs the higher end. For light deburring or weld blending a mid-range wattage is more than enough and keeps the tool lighter in hand.