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2. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   A hex key (also, hex wrench, Allen key and Allen wrench, Unbrako or Inbus) is a simple driver for bolts or screws that have heads with internal hexagonal recesses ().. Hex keys are formed from a single piece of hard hexagonal steel rod, having blunt ends that fit snugly into similarly shaped screw sockets.

3. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   The hex socket screw drive has a hexagonal recess and may be driven by a hex wrench, also known as an Allen wrench, Allen key, hex key, or inbus as well as by a hex screwdriver (also known as a hex driver) or bit. Tamper-resistant versions with a pin in the recess are available.

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A hex key (sometimes referred to as an Allen wrench, Allen key, or hex driver) is required to tighten or loosen a socket screw. Socket head capscrews are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket. carriage bolt: cup head bolt, coach bolt

5. Preferred metric sizes - Wikipedia

   en.wikipedia.org/wiki/Preferred_metric_sizes

   Machine screws with different thread diameters Hex key set with metric sizes from 2 mm to 10 mm according to sizes for use with ISO 262 screw sizes (except 3.5 mm for M6 internal set screw) For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including:

6. Allen (brand) - Wikipedia

   en.wikipedia.org/wiki/Allen_(brand)

   The terms "Allen wrench" (American English, though "Allen key" is also common in the US) and "Allen key" (British English) [3] are derived from the Allen brand name and refer to the generic product category "hex keys". W.G. Allen [4] filed the first related patent in 1909 for its recessed hex-driven safety screws, [5] a safety improvement over ...

7. Nut driver - Wikipedia

   en.wikipedia.org/wiki/Nut_driver

   They are typically used for lower torque applications than wrenches or ratchets and are frequently used in the appliance repair [1] and electronics industries. [ 2 ] Variations include T-shaped handles for providing the operator with a better grip, ratcheting handles, sockets with recessed magnets for holding fasteners , and flex shafts for ...