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2. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   In 1913, Woolley and Meredith defined them like Anthony, but gave the following dimensions: hex head cap screws up to and including 7 ⁄ 16 inch (11.1125 mm) have a head that is 3 ⁄ 16 inch (4.7625 mm) larger than the shank diameter; screws greater than 1 ⁄ 2 inch (12.7 mm) in diameter have a head that is 1 ⁄ 4 inch (6.35 mm) larger than ...

3. File:Screw head types.svg - Wikipedia

   en.wikipedia.org/wiki/File:Screw_head_types.svg

   profiles of screw heads: (a) pan, (b) dome or button, (c) round, (d) truss or mushroom, (e) flat or countersunk, (f) oval or raised head: Date: 24 July 2007, 13:54: Source: Screw head types.png originally created by Wapcaplet and released under a GFDL license: Author: Vectorized version by of Sakurambo: Permission (Reusing this file)

4. 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 ...

5. Bolt (fastener) - Wikipedia

   en.wikipedia.org/wiki/Bolt_(fastener)

   Coach screws, or lag screws, for example, are large square-headed screws with a tapered wood screw thread, used for attaching ironwork to timber. Head designs that overlap both bolts and include the Allen, Torx, hexagonal and splined heads. These modern designs span a large range of sizes and can carry a considerable torque.

6. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   An assortment of screws, and a US quarter for size comparison A wood screw: a) head; b) non-threaded shank; c) threaded shank; d) tip The six classical simple machines. A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force to the head.

7. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   A hex screw drive uses six-sided fastener heads, and the fastener is known as a hex head cap screw. It can be turned with an adjustable wrench, combination wrench and 6- or 12-point sockets. The hex drive is better than square drive for locations where surrounding obstacles limit wrenching access, because smaller wrench-swing arcs can still ...