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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.

3. Nut (hardware) - Wikipedia

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

   Flange nut: Collar nut Has a wide flange at one end that acts as an integrated washer HARDLOCK Nut [3] Eccentric Double Nut A self-lock nut. Improvement of the double nut that uses a wedge principal, eliminating space between threads. Insert nut: Threaded socket A threaded socket for a wooden workpiece, similar to a wall anchor. Knurled nut ...

4. 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])

5. 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 ...

6. Bolt (fastener) - Wikipedia

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

   Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them. Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end. Common bolt heads include hex, slotted hex washer, and socket cap.

7. Positive locking device - Wikipedia

   en.wikipedia.org/wiki/Positive_locking_device

   A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices: [1] A split beam nut; A castellated nut and a split pin; A hex nut or cap screw and a tab washer