Dead-Blow Hammer
A specialized mallet filled with steel shot that delivers maximum impact force with zero rebound or bouncing.
A dead-blow hammer is a specialized mallet designed to deliver high striking force with minimal rebound (bouncing) and without damaging the struck surface. The head of the hammer is hollow and filled with loose steel shot or sand. When the hammer strikes a surface, the shot slides forward, absorbing the energy of the rebound and keeping the face of the hammer pressed against the target.
Dead-blow hammers are typically coated in durable polyurethane or rubber, which prevents them from scratching or denting metal parts. In automotive work, they are used to separate frozen steering knuckles, tap brake rotors off hub assemblies, break loose stuck oil pans, and install hub assemblies. The lack of rebound reduces wrist fatigue and prevents the tool from bouncing back and hitting adjacent components.
Unlike steel ball-peen hammers, a dead-blow hammer will not spark when striking metal, making it safer to use in engine compartments. Mechanics use them when they need to apply heavy force without marring aluminum, cast iron, or painted surfaces. If the polyurethane cover splits or wears through, the hammer must be replaced to prevent the steel shot from leaking out.