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2. Berry Brothers Bolt Works - Wikipedia

   en.wikipedia.org/wiki/Berry_Brothers_Bolt_Works

   The Berry Brothers Bolt Works is a former factory in Columbus, Ohio, United States. For more than a century after its 1888 construction, the factory produced machine tools using original equipment. The structure itself is one of Columbus' most prominent factory buildings, and it was named a historic site in its centennial year.

3. 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]

4. ISO metric screw thread - Wikipedia

   en.wikipedia.org/wiki/ISO_metric_screw_thread

   This is also referred to as the "major" diameter in the information below. It indicates the diameter of smooth-walled hole that a male thread (e.g. on a bolt) will pass through easily to connect to an internally threaded component (e.g. a nut) on the other side. For example, an M6 screw has a nominal outer diameter of 6 millimetres and will ...

5. File:Columbus Ohio Berry Brothers Bolt Works.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Columbus_Ohio_Berry...

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   A fastener comprising a mated pair of screw and post (binding barrel), which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides the bearing surface.

7. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Either method leaves only a smooth bolt head exposed. This type of bolt is commonly used with prison door locks, automobile ignition switches, and street signs, to prevent easy removal. An alternative design leaves a low-profile button head visible after installation. [72] In addition to breakaway bolts, breakaway nuts of similar design are ...