A rotary hammer, also known as a rotary hammer drill or simply a hammer drill, is a powerful tool used primarily for drilling in hard materials such as concrete, stone, and masonry. It combines the functions of a hammer and a drill, providing both rotary motion and a hammering action to break through tough surfaces. The hammering action is achieved through a piston mechanism that delivers rapid, high-impact blows to the drill bit, allowing it to penetrate hard materials more efficiently than a standard drill.

Rotary hammers are available in various sizes and power ratings, ranging from lightweight models for occasional use to heavy-duty models for professional construction work. They typically feature multiple modes, including drill-only, hammer-only, and hammer-drill modes, making them versatile tools for different applications. Some models also come with additional features such as adjustable speed settings, depth stops, and vibration reduction systems to enhance user comfort and precision.

The tool is commonly used in construction, renovation, and demolition projects, where drilling into hard materials is frequently required. It is also used for tasks such as chiseling and breaking up concrete, thanks to its powerful impact mechanism. When using a rotary hammer, it is important to wear appropriate safety gear, including eye protection and ear protection, due to the high noise levels and potential for flying debris.