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2. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Standard 12-point hex socket bits and wrenches fit these screws. The screw heads are typically flanged, and may fit into standard Allen hex socket cap screw counterbores molded or machined into parts to be fastened. Compared to Allen hex sockets, the advantages of these bolts include higher torque capability and the lack of a recess to trap water.

3. Hex key - Wikipedia

   en.wikipedia.org/wiki/Hex_key

   Cap head screws of various sizes Button head screws. Hex keys are best known as "Allen keys" or "Allen wrenches" in English-speaking countries like the UK, Australia, Canada and the U.S. and in Spanish-speaking countries such as Spain and Mexico (The "Allen" name is a registered trademark, originated by the Allen Manufacturing Company of ...

4. Screwdriver - Wikipedia

   en.wikipedia.org/wiki/Screwdriver

   A set of "secure" or otherwise less common screwdriver bits, including secure Torx and secure hex or "Allen" variants. Many modern electrical appliances, if they contain screws, use screws with heads other than the typical slotted or Phillips styles. Torx is one such pattern that has become widespread. It is a spline tip with a corresponding ...

5. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   An ASME B18.2.1 compliant cap screw has somewhat tighter tolerances than a hex bolt for the head height and the shank length. The nature of the tolerance difference allows an ASME B18.2.1 hex cap screw to always fit where a hex bolt is installed but a hex bolt could be slightly too large to be used where a hex cap screw is designed in.

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. Preferred metric sizes - Wikipedia

   en.wikipedia.org/wiki/Preferred_metric_sizes

   For each size bolt or screw and type of head, there is a corresponding size driver prescribed by various ISO standards, including: Internal hex drive: ISO 2936:2014 "Assembly tools for screws and nuts—Hexagon socket screw keys" [5] External hex drive: ISO 4014, 4016, 4017, and 4018 [6]