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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. ... Sleeve nut: Spring nut ... Serrated flange nut; Speed nut (Sheet metal nut or Tinnerman nut)

4. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   It is a sleeve similar to a close nipple, but is threaded on both its inner and outer circumferences. Like a reducer, a double-tapped bushing has two threads of different sizes. A common type of this style fitting is a "hex bushing" with a hex head for installation with a pipe wrench.

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. Weld neck flange - Wikipedia

   en.wikipedia.org/wiki/Weld_neck_flange

   A weld neck flange (also known as a high-hub flange [1] and tapered hub flange [2]) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. [3] A weld neck flange consists of a circular fitting with a protruding rim around the circumference.

7. Sex bolt - Wikipedia

   en.wikipedia.org/wiki/Sex_bolt

   Sleeve nuts, one with mating bolt. A sex bolt is a type of fastener comprising a mated pair of screw and post, which are a machine screw and a nut that is barrel-shaped. The nut has a flange and a protruding boss that is internally threaded. The bolt (mated pair, screw and post) sits within the components being fastened, and the flange provides ...