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Dead blow hammer
A dead blow hammer is a specialized mallet helpful in minimizing damage to the struck surface and in controlling striking force with minimal rebound from the struck surface. The minimal rebound is helpful in avoiding accidental damage to precision work, especially in tight locations.
==Description==
The head of a dead blow hammer is commonly hollow and partially filled with loose sand, lead shot, or steel shot, which distribute the energy of the strike over a longer period of time. If a filled hammer head breaks while in use, it is likely to scatter a spray of the loose filler particles in the vicinity. Therefore, use of a traditional dead blow hammer may be restricted in certain settings, such as a manufacturing clean room, where contamination by foreign material (in this case the loose fill material) could occur.
Some dead blow hammers have completely solid heads, usually made of rubber or resilient plastic (such as ultra high molecular weight plastic, UHMW), and rely on the inherent properties of the material to absorb shock and reduce rebound. Commonly constructed of polyurethane, dead blow hammers regularly appear in solid orange or black. Composite heads and fiberglass handle models are also available, with optional shock-absorbent rubber grips. A variant design omits the handle entirely; the dead blow head is gripped directly in the hand, for use in tight locations.
Some dead blow hammers have replaceable striking faces, attached by screwing or pressing them into place on the main body of the hammer. These replaceable inserts allow selection of the appropriate hardness for the striking face to reduce damage to an object being hammered, while optimizing the energy transfer of impact. Also, worn or damaged inserts can be replaced without discarding the entire handtool.
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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