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2. 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. If this nut were not used the ...

3. Nut (hardware) - Wikipedia

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

   3.1 Metric hex nuts. 3.2 SAE hex nuts. ... [1][2] but also pipes Flange nut: Collar nut ... Serrated face nut; Serrated flange nut;

4. Serrated face nut - Wikipedia

   en.wikipedia.org/wiki/Serrated_face_nut

   Serrated face nut. A serrated face nut is a locknut with ridges on the face of the nut that bite into the surface it is tightened against. The serrations are angled such that they keep the nut from rotating in the direction that would loosen the nut. Due to the serrations they cannot be used with a washer or on surfaces that cannot be scratched ...

5. 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

6. Locknut - Wikipedia

   en.wikipedia.org/wiki/Locknut

   Keps nut (K-nut or washer nut) with a free-spinning washer. In the locknut form, this is a star-type lock washer. Plate nut; Polymer insert nut ; Security locknut All steel reusable nut for high vibration and harsh environments. Serrated face nut; Serrated flange nut; Speed nut (sheet metal nut or Tinnerman nut) Split beam nut (BINX nut [5])

7. Weld nut - Wikipedia

   en.wikipedia.org/wiki/Weld_nut

   Tab base nuts are designed for spot welding on flat workpieces. They have a locating boss around the threads to locate it in a pilot hole. [1] Hex & square nuts. These nuts are very similar to standard square or hex nuts, but have a locating boss and welding projections. The bosses also keep weld spatter out of the threads. [2] Retainer weld nuts