A sledgehammer is a tool with a large, flat, massive, often metal head, attached to a long wooden or solid handle. The long handle is combined with a heavy head which allows the sledgehammer to pick up momentum during a swing and applying a large force compared to hammers designed to drive nails. Along with the mallet, it shares the ability to distribute force over a wide area. This is in contrast to other types of , which concentrate gravity and force in a relatively small area.
Sledgehammers are often used in demolition work, for breaking through drywall or masonry . Sledgehammers were formerly widely used in mining operations, particularly hand steel, but are rarely used in modern mining. Sledgehammers are also used when substantial force is necessary to dislodge a trapped object (often in farm or oil field work), or for fracturing concrete. Another common use is for driving fence posts into the ground. Sledgehammers are used by police forces in raids on property to gain entry by force, commonly through doors. They were and still are commonly used by blacksmiths to shape heavy sections of iron. The British SAS counter terrorist team used sledgehammers to gain access to rooms during the 1980 Iranian Embassy Siege. However, today they use a tool called a "dynamic hammer".
Another use of sledgehammers is for driving railroad spikes into wooden Railroad tie during rail construction. When the two ends of the Union Pacific railroad were joined at Promontory, Utah, Leland Stanford hammered a golden spike into a sleeper with a silver hammer.Ambrose, Stephen E. Nothing Like It In The World. (2001) p. 365-367. Sledges used to drive spikes for rails had curved heads that came down to a "beak" that was only about one inch across. The shape meant that drivers needed to be accurate, and spot where the spike hit was often not much larger than a small coin, as anything larger would hit the plate or the sleeper. The curved head kept the handle away from the rail, as the spikes were driven with the rail between the spike and the driver. These are often called .
Scouts BSA has adopted the shorter sledgehammer, commonly referred to as an engineer's hammer, as an unofficial tool referred to as the scout hammer, as a complement to the pocket knife and hand axe. The handle is long with a head weighing . The hammer is used for a variety of purposes such as driving tent stakes, establishing temporary fencing using wood or metal rebar, splitting wood in conjunction with a wedge, or straightening bent objects.
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