Power Tools and Air Tools

Power tools multiply your speed and capability. Understanding what each one does and when to use it versus when a hand tool is the right choice is part of being a professional.

An impact wrench — usually air-powered or battery-powered — delivers rapid hammering blows while turning. This breaks loose fasteners that a ratchet cannot budge. Impact wrenches are essential for lug nuts, suspension bolts, and exhaust fasteners. Never use a standard chrome socket on an impact wrench — chrome sockets are brittle and will shatter. Use impact-rated sockets only — they are made of softer steel that absorbs the impact energy without cracking. Impact sockets are typically black in color.

An air-powered ratchet spins the socket continuously without hammering. Faster than a hand ratchet for running fasteners in and out. Not for final tightening — always finish with a torque wrench or hand ratchet to avoid overtightening.

A die grinder spins a small abrasive wheel, burr, or sanding disc at high speed. Used for grinding welds, cutting bolts, removing rust, and cleaning surfaces. A cutoff wheel attachment cuts through exhaust pipes, bolts, and metal. Always wear safety glasses and a face shield when grinding — hot sparks and metal fragments fly in every direction. Never remove the guard from a grinder.

Battery-powered impact wrenches and ratchets have replaced air tools in many shops. No hose to drag around. More portable. Modern lithium-ion batteries deliver power comparable to air tools. The trade-off is battery weight and the need to keep batteries charged. Most techs carry both — cordless for convenience and air for heavy-duty applications where sustained power is needed.