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2. Nut (hardware) - Wikipedia

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

   Square nut: Four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening) [citation needed] Swage nut: Self-clinching nut Used on sheet metal.

3. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Hexagon flange bolts with reduced shank: Withdrawn: DIN EN 1665: EN 1665: DIN 6923: Hexagon nuts with flange: Withdrawn: DIN EN 1661: EN 1661: DIN 6924: Prevailing torque type hexagon nuts with nonmetallic insert: Withdrawn: DIN EN ISO 7040, DIN EN ISO 10512: ISO 7040, ISO 10512: DIN 6925: Prevailing torque type all-metal hexagon nuts ...

4. Bolt (fastener) - Wikipedia

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

   Hanger bolt - Bolt that has no head, machine threaded body followed by a wood threaded screw tip. Allow nuts to be attached to what is really a screw. Hex bolt - Bolt with a hexagonal head and threaded shank. Section immediately under head may be unthreaded for fastening thicker materials. J bolt - Bolt shaped like the letter J, used for tie downs.

5. Flange nut - Wikipedia

   en.wikipedia.org/wiki/Flange_nut

   A self-aligning nut, also known as a spherical nut [2] or leveling nut, is a type of nut used in applications where the fastener is not perpendicular to the surface to which the nut anchors. A flange nut is used inside a specially shaped dished-out washer. The device is commonly used in the aerospace industry.

6. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   set bolt: tap bolt, setscrew: A bolt that is threaded all the way to the head. An ASME B18.2.1 compliant set/tap bolt has the same tolerances as an ASME B18.2.1 compliant hex cap screw. set screw: grub screw: A set screw is generally a headless screw but can be any screw used to fix a rotating part to a shaft, such as a line shaft or ...

7. Wrench size - Wikipedia

   en.wikipedia.org/wiki/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