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2. List of thread standards - Wikipedia

   en.wikipedia.org/wiki/List_of_thread_standards

   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 Pipe Threads: V Thread Form (55°) 1 ⁄ 4 ″-20 BSW ISO 68-1:1998: ISO general purpose screw threads—Basic profile—Part 1: Metric screw ...

3. Nut (hardware) - Wikipedia

   en.wikipedia.org/wiki/Nut_(hardware)

   The construction firm responsible, Fox Henderson, decided to use nuts and bolts, but to use standardised sizes, a revolutionary method at the time. This enabled the building to be completed in time. The use of interchangeable nuts and bolts was so successful that the Whitworth standard was widely adopted.

4. List of drill and tap sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

   Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.

5. Width across flats - Wikipedia

   en.wikipedia.org/wiki/Width_across_flats

   A few sizes are close enough to interchange for most purposes, such as 19 mm (close to 3 ⁄ 4 inch (19.05 mm)), 8 mm (close to 5 ⁄ 16 inch (7.94 mm)) and 4 mm (close to 5 ⁄ 32 inch (3.97 mm)). In reality, a wrench with a width across the flats of exactly 15 mm would fit too tightly to use on a bolt with a width across the flats of 15 mm.

6. Speed nut - Wikipedia

   en.wikipedia.org/wiki/Speed_nut

   When the fastener is tightened, the base of the nut, which is arched, elastically deforms and applies a force to the fastener, which locks it from loosening under vibrations. [1] There are many different types of speed nuts, mostly dependent on the shape of the nut, how it attaches to the workpiece, and what type of screw can be used.

7. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   DIN 971-1: Style 1 hexagon nuts with metric fine pitch thread; property classes 6 and 8: Withdrawn: DIN EN ISO 8673: ISO 8673: DIN 971-2: Style 2 hexagon nuts with metric fine pitch thread; property classes 10 and 12: Withdrawn: DIN EN ISO 8674: ISO 8674: DIN 972: M5 to M39 hexagon nuts; style 1; product grade C (modified version of ISO 4034 ...