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Ball-peen hammer
A ball-peen (also spelled ball-pein) hammer, also known as a machinist's hammer, is a type of peening hammer used in metalworking. It is distinguished from a cross-peen hammer, diagonal-peen hammer, point-peen hammer, or chisel-peen hammer by having a hemispherical head.
==Uses==
Though the process of peening (surface hardening by impact) has become rarer in metal fabrication, the ball-peen hammer remains useful for many tasks, such as striking punches and chisels (usually performed with the flat face of the hammer). The peening face is useful for rounding off edges of metal pins and fasteners, such as rivets.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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