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2. Washer (hardware) - Wikipedia

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

   Washer (hardware) Assorted washers: flat, split, star and insulating. A washer is a thin plate (typically disk-shaped, but sometimes square) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a bolt or nut. Other uses are as a spacer, spring ( Belleville washer, wave washer), wear ...

3. Retaining ring - Wikipedia

   en.wikipedia.org/wiki/Retaining_ring

   Retaining ring. A retaining ring is a fastener that holds components or assemblies onto a shaft or in a housing /bore when installed - typically in a groove - for one time use only. Once installed, the exposed portion acts as a shoulder which retains the specific component or assembly. Circlips are a type of retaining ring.

4. Circle cotter - Wikipedia

   en.wikipedia.org/wiki/Circle_cotter

   A circle cotter, also known as a cotter ring [1] or split ring, [2] is a formed wire fastener that is shaped like a circle, hence the name. The open end of the wire is in the middle of the cotter so when it is installed the inner tab is first installed in the hole. Because of this feature it is often used in applications where a sharp edge ...

5. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Copper fittings for soldered joints. Pipe fittings: 1) Copper (solder); 2) Iron or brass (threaded); 3) Brass (compression); 4) Brass (compression to solder); 5) Brass adapters. PVC fittings. A fitting or adapter is used in pipe systems to connect sections of pipe (designated by nominal size, with greater tolerances of variance) or tube ...

6. Keychain - Wikipedia

   en.wikipedia.org/wiki/Keychain

   Keychain. A keychain ( / ˈkitʃeɪn / ⓘ) (also key fob or keyring) is a small ring or chain of metal to which several keys can be attached. The length of a keychain allows an item to be used more easily than if connected directly to a keyring. Some keychains allow one or both ends to rotate, keeping the keychain from becoming twisted, while ...

7. Split-ring resonator - Wikipedia

   en.wikipedia.org/wiki/Split-ring_resonator

   A split-ring resonator array is configured as a material that produces a negative index of refraction. It was constructed of copper split-ring resonators and wires mounted on interlocking sheets of fiberglass circuit board. The total array consists of 3 by 20×20 unit cells with overall dimensions of 10×100×100 mm. [ 1][ 15] Split-ring ...