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A detailed buying guide: how to choose a pneumatic angle grinder.
This section covers pneumatic angle grinders, mostly with 100–125 mm discs and some models with 180 mm discs, for cutting metal, cleaning weld seams, grinding and removing rust. They are widely used in car body repair, metalworking shops and production, and in explosion-risk or damp areas where electric tools are undesirable. The tool is light, powerful and durable and has no electric motor, so there is no risk of electric shock or motor overheating, but it only works with an electric or petrol compressor of matching capacity. For how air tools work, read what pneumatic tools are and how they work.
Compact 100–115 mm models suit body repair, cutting in tight spaces and seam cleaning, 125 mm models suit general workshop use, and 180 mm models suit thick metal and grinding large surfaces. Disc diameter determines cutting depth and the amount of air required. See how to choose the correct disc diameter.
Some 100–115 mm pneumatic angle grinders have an M10 spindle, while most 125 and 180 mm models use M14, which is compatible with standard discs and flange nuts. Also check that the maximum rated speed of the disc exceeds the speed of the tool. Read what is an m14 spindle.
Free speed of 100–125 mm models is usually 10,000–12,000 RPM, and of 180 mm models 6,000–8,500 RPM. Air motor power is 400–900 W and up to 1.5 kW on large-disc models, which keeps the speed up under load. See what is rotational speed (RPM).
A pneumatic angle grinder is one of the most air-hungry tools: 125 mm models typically use 250–450 l/min and 180 mm models 600 l/min or more. The real delivery of the compressor should be about 30–50 % higher, otherwise speed and cutting rate drop. Read how to choose an air compressor and how to calculate compressor air delivery.
The rated working pressure is 6.2–6.3 bar, and the inlet is usually 1/4", or 3/8" on larger models, with a EURO, ORION or RAPID quick coupler. Because of the high air consumption, choose a hose with an inner diameter of 8–10 mm and avoid overly long lines. See how to choose compressor working pressure and how to choose an air hose and connectors.
Choose models with a lever trigger and a safety lock against accidental start-up, plus an adjustable guard. Disconnect the air before changing discs and never use the tool without the guard. Read how to use an angle grinder safely and how to use pneumatic tools safely.
A rear or rotating exhaust directs air away from the face and the work surface, while a weight of 1.2–2.5 kg and an anti-vibration handle reduce fatigue. Because of sparks and debris, always wear safety glasses or a face shield, gloves and ear protection. See how to choose safety glasses.
Condensate and dirt quickly wear the vanes and bearings of the air motor, so use a filter-water separator, a regulator and air tool oil or a lubricator. Worn vanes, bearings, seals and the guard can be replaced with spare parts. Read how to prepare compressed air: condensate, filters, regulators, and lubricators and how to choose spare parts for pneumatic and hydraulic tools.
At ToolsArmenia you can compare pneumatic angle grinders by disc diameter, spindle thread, speed, air consumption and weight and choose a model that suits your jobs and compressor.
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