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hex key
A hex key or Allen key is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive).
The Allen name is a registered trademark, originated by the Allen Manufacturing Company of Hartford, Connecticut circa 1910, and currently owned by Apex Tool Group, LLC. Its genericized use is discouraged by this company. The standard generic name used in catalogs and published books and journals is "hex key".
==Nomenclature==
The term "hex key" has various synonyms. Some are explained by the geographical and commercial history of the drive type's development: these include ''Allen'', ''Unbrako'', and ''Inbus'' key or wrench. The synonym ''zeta'' key or wrench refers to the sixth letter of the Greek alphabet. The term ''hex-head'' is sometimes used to refer to this type of drive, but this use is not consistent with its more conventional use referring to external-wrenching hexagons.
In the fastener industry, the terms ''socket head'' or ''hex socket head'' are generally used for the driven part of the driver–driven pair. A less common synonym is ''female hex''.
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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