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2. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Unlike "regular" bolts, a carriage bolt has a smooth head that does not accept tools; instead, counter-rotation is provided by the square section of shank. Carriage bolts are used where the appearance of the finished part is important, for example on carriage exteriors: the bolt is inserted from the outside of the part, with only the smooth ...

3. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Width_across_flats

   The tolerances necessary to make the tools usable are listed in documents such as ASME/ANSI B18.2.2 for U.S. standards. [1] For instance, a bolt for a 1-inch nominal diameter thread might have flats that are 1.5 inches apart. The wrench for this bolt should have flats that are between 1.508 and 1.520 inches apart to allow for a little extra space.

4. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   M6 and M8 triple square drivers End view of M10 triple square screw. The triple-square, also known as XZN, is a type of screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle. The name derives from overlaying three equal squares to form such a pattern with 12 right-angled protrusions (a 12-pointed star).

5. Square thread form - Wikipedia

   en.wikipedia.org/wiki/Square_thread_form

   The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [ 1 ] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.

6. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   The length of a machine screw or bolt is indicated by an × and the length expressed in millimetres (e.g. M8-1.25×30 or M8×30). [citation needed] Tolerance classes defined in ISO 965-1 can be appended to these designations, if required (e.g. M500– 6g in external threads). External threads are designated by lowercase letter, g or h.

7. Barrel threads - Wikipedia

   en.wikipedia.org/wiki/Barrel_threads

   M designates common V threads (like for instance metric threads); Sq designates square threads; Tr designates trapezoidal threads; The shank length is not always the same at the thread length, which is the case if the insert has a threadless portion (sub-shank)