Definitions for ball-peen hammerˈbɔlˌpin
Random House Webster's College Dictionary
Category: Building Trades
a hammer with one round and one flat end; used in working metal
A hammer having, besides the normal flat head, an opposite, rounded or peening head.
A ball-peen 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, point-peen hammer or chisel-peen hammer by having a hemispherical head. Though the process of peening has become rarer in metal fabrication, the ball-peen hammer remains useful for many tasks, such as striking punches and chisels.
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"ball-peen hammer." Definitions.net. STANDS4 LLC, 2013. Web. 5 Dec. 2013. <http://www.definitions.net/definition/ball-peen hammer>.