ballpein

A ballpein hammer, also written as ball-pein or ball pein, is a hand tool used in metalworking. The hammer’s head combines two striking surfaces: a flat face for general hammering and a hemispherical ball pein on the opposite side. The head is typically made of steel and mounted on a wooden, fiberglass, or metal handle. Domestic models commonly weigh from about 8 to 16 ounces, while heavier professional versions are available.

Uses and applications include shaping and forming sheet metal, starting and smoothing rivet holes, and peening—finishing metal surfaces by controlled deformation. The ball end is especially suited for creating dimples, forming domed shapes, and setting rivet heads without excessive marring of surrounding material. In jewelry making, watch repair, and light metal fabrication, the ball pein allows precise, localized work that complements the flat face’s broad hammering.

Variations and related tools: Ballpein hammers come in different weights and ball diameters to suit the material and task. There are also cross-pein and straight-pein hammers, whose pein faces are wedge-shaped or narrow, respectively; these are used for riveting, shaping, and splitting metal in different ways. Some hammers feature hardened heads or replaceable handles and finishes intended to reduce corrosion and improve grip.

Safety and care: Regularly inspect the head for cracks and the handle for looseness. Use appropriate eye protection and maintain a clean, dry handle to prevent slips. Avoid striking very hard surfaces with the ball end on softer materials to prevent mushrooming or unintended damage.