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2. Dzus fastener - Wikipedia

   en.wikipedia.org/wiki/Dzus_fastener

   The Dzus fasteners (gold coloured circular objects) fastening the cowling panels of the 1930s Hawker Hind. The Dzus fastener, also known as a turnlock fastener or quick-action panel fastener, [1] is a type of proprietary quarter-turn spiral cam lock fastener often used to secure skin panels on aircraft and other high-performance vehicles.

3. William Dzus - Wikipedia

   en.wikipedia.org/wiki/William_Dzus

   William Dzus (born Volodymyr Dzhus (Ukrainian: Володимир Джус; 5 January 1895, Chernykhivtsi, Kingdom of Galicia and Lodomeria, currently Ukraine – 19 June 1964, New York City, United States) was an American engineer from Eastern Galicia, and the inventor of the Dzus fastener, also known as the quarter-turn fastener. [1]

4. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   Pentalobe screw sizes include TS1 (also known as P2 or 0.8 mm, used on the iPhone 4 and subsequent models), TS4 (also known as P5 or 1.2 mm, used on the MacBook Air [since late 2010], the MacBook Pro with Retina Display and the 2015 MacBook) and TS5 (also known as P6 or 1.5 mm, used on the 2009 MacBook Pro battery).

5. Robertson screw - Wikipedia

   en.wikipedia.org/wiki/Robertson_screw

   A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper .

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will wear and will lose holding power. Ideally 1-1/4" to 1-1/2" of screw thread in the concrete. [1] So for example, if a 1/2" board is being screwed onto the concrete, a 1-3/4" to 2" concrete screw should be used ...

7. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   ASME B1.20.1-2013: Pipe Threads, General Purpose (Inch) Pipe Thread Form ANSI B1.20.3-1976 (R2013) Dryseal Pipe Threads (Inch) Pipe Thread Form ASME B1.20.7-1991 (R2013) Hose Coupling Screw Threads - Inch: Pipe Thread Form ASME B1.21M-1997 (R2013) Metric Screw Threads - MJ Profile: V Thread Form BS 84: Tables of BS Whitworth, BS Fine and BS ...