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2. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A double-tapped bushing, commonly shortened to bushing, is a fitting which serves as a reducer. 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.

3. Threaded insert - Wikipedia

   en.wikipedia.org/wiki/Threaded_insert

   TIME-SERT insert. A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. [1] They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work piece thereby eliminating a machining operation, or ...

4. Locknut - Wikipedia

   en.wikipedia.org/wiki/Locknut

   A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut, [1] stiff nut [1] or elastic stop nut, [2] is a nut that resists loosening under vibrations and torque. Prevailing torque nuts have some portion of the nut that deforms elastically to provide a locking action. [ 2 ]

5. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   These threads are now used in materials other than steel and brass, including PTFE, PVC, nylon, bronze, and cast iron. The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to parallel/straight thread fittings or compression fittings in which the threads merely hold ...

6. Electrical conduit - Wikipedia

   en.wikipedia.org/wiki/Electrical_conduit

   A typical box connector is inserted into a knockout in a junction box, with the threaded end then being secured with a ring (called a lock nut) from within the box, as a bolt would be secured by a nut. The other end of the fitting usually has a screw or compression ring which is tightened down onto the inserted conduit. Fittings for non ...

7. Nut (hardware) - Wikipedia

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

   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: Thumb nut

8. Nipple (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Nipple_(plumbing)

   A chase nipple has male threads on one end only. The other end is a hexagon. The chase nipple passes through the knockouts of two boxes, and is secured by an internally threaded ring called a lock nut. [1] [2] Chase-Shawmut Company, of Boston, is the company which first produced chase nipples. [3]

9. Distorted thread locknut - Wikipedia

   en.wikipedia.org/wiki/Distorted_thread_locknut

   A distorted thread locknut, [1] is a type of locknut that uses a deformed section of thread to keep the nut from loosening due to vibrations, or rotation of the clamped item. There are four types: elliptical offset nuts , centerlock nuts , toplock nuts and partially depitched (Philidas) nuts .