A hex key, also known as an Allen Key, Allen wrench or hex wrench is a small L shaped or T shaped tool with a 6-sided hexagonal tip which is used to loosen hex socket screws or bolts.
Hex keys, commonly known as Allen keys/wrenches in the UK and various other countries, are a very simple hand tool of the general spanner and socket family, used for tightening and loosening hexagonal bolts and other compatible fasteners.
A hex key, also known as an Allen key is a simple tool used to drive bolts and screws with hexagonal sockets in their heads. From standard keys in chrome vanadium steel to extra-long with ballpoint heads in chrome molybdenum steel, there are a wide variety to choose from.
They are called “hex keys” because they use six points of contact. In other words, a hex key touches a half-dozen difference surfaces of the hex screw. The use of six points of contact allows the hex key to easily grab the hex key. If a tool uses five or fewer points of contact, it isn’t considered a hex key.
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Welding Machine-200a (Ingco)