ballpeen

A ball-peen hammer, sometimes spelled ball-pein hammer, is a traditional hand tool used primarily in metalworking. It has a flat striking face on one side and a rounded, hemispherical end on the other, the latter referred to as the peen. The ball end is used for peening, which hardens or smooths metal, as well as for shaping, texturing, and creating dimples or indentation without marring the surface.

Commonly employed in metal fabrication, jewelry making, and automotive bodywork, the ball end is useful for forming rivet heads, closing seams, and detail work on sheet metal. It can also be used to set punches and stamps, refine hammer marks, and shape curves in soft metals. While the flat face handles general hammer blows, the ball end provides a different control for delicate work or where a rounded surface is needed.

Sizes and construction vary. Typical weights range from about 8 to 32 ounces (roughly 225 to 900 grams). Handles are usually made of wood, fiberglass, or steel with a comfortable grip, and the head is hardened steel. The ball end diameter and the flat-face dimensions differ by model, influencing balance and impact.

Care and safety are important: use appropriate eye protection, maintain a secure handle, and avoid mushrooming of the head by inspecting and grinding as needed. Use the tool for its intended metalworking tasks and avoid striking very hard or non-metallic surfaces with the ball end.