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2. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   dowel screw. hanger bolt. handrail bolt. Similar to a wood screw but with two pointed ends and no head, used for making hidden joints between two pieces of wood. A hanger bolt has wood screw threads on one end and machine threads on the other. A hanger bolt is used when it is necessary to fasten a metal part to a wood surface.

3. Bolt (fastener) - Wikipedia

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

   For other uses, see Bolt (disambiguation). A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to a matching nut. The bolt has an external male thread requiring a matching nut with a pre-formed female thread. [1]

4. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   ISO general purpose metric screw threads – Part 12: 1 to 300 mm diameter coarse and fine pitch threads Selected diameters and pitches: Active: DIN 13-13: ISO general purpose metric screw threads – Part 13: Selected sizes for screws, bolts and nuts from 1 to 52 mm screw thread diameter and limits of sizes: Active: DIN 13-19

5. Screw - Wikipedia

   en.wikipedia.org/wiki/Screw

   Thus, an M6 screw, which has a pitch of 1 mm, is made by threading a 6 mm shank, and the nut or threaded hole is made by tapping threads into a hole of 5 mm diameter (6 mm − 1 mm). Metric hexagon bolts, screws and nuts are specified, for example, in International Standards ISO 4014, ISO 4017, and ISO 4032. The following table lists the ...

6. Wrench size - Wikipedia

   en.wikipedia.org/wiki/Wrench_size

   Wrench size. spanner (wrench) size and thread diameter of a hex nut. Width across flats is the distance between two parallel surfaces on the head of a screw or bolt, or a nut, mostly for torque transmission by positive locking. The term width across flats (AF) is used for the following forms: 2-socket = round material with two surfaces.

7. Screw thread - Wikipedia

   en.wikipedia.org/wiki/Screw_thread

   A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. A screw thread is the essential feature of the screw as a simple machine and also as a threaded fastener. The mechanical advantage of a screw thread depends on its lead, which ...