Ball-peen hammer

Example of a hard-faced ball-peen hammer

A ball-peen or ball pein hammer, also known as a machinist's hammer,[1] is a type of peening hammer used in metalworking. It has two heads, one flat and the other, called the peen, rounded. It is distinguished from a cross-peen hammer, diagonal-peen hammer, point-peen hammer, or chisel-peen hammer by having a hemispherical peen.

  1. ^ Audel, Theodore (1962). Audels new mechanical dictionary for technical trades. Theodore Audel. p. 54.