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2. Circlip - Wikipedia

   en.wikipedia.org/wiki/Circlip

   A circlip (a portmanteau of "circle" and "clip"), also known as a C-clip, snap ring, or ', [1] is a type of fastener or retaining ring that consists of a semi-flexible metal ring with open ends that can be snapped into place into a machined groove on a dowel pin or other part to permit rotation but to prevent axial movement.

3. Retaining ring - Wikipedia

   en.wikipedia.org/wiki/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.

4. Bicycle tools - Wikipedia

   en.wikipedia.org/wiki/Bicycle_tools

   This tool also has a lockring spanner for securing a reverse threaded lockring against the sprocket. Bottom bracket wrench for newer bottom bracket styles Crank extractor. A chain tool or chain splitter is used to 'break' a chain, in order to remove it from a bike or remove links, or to put a chain back together.

5. Bearing (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(mechanical)

   A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

6. Fastener - Wikipedia

   en.wikipedia.org/wiki/Fastener

   Flange head fasteners: Integrating a flange for a larger bearing surface, flange head fasteners distribute clamping force without damaging the material. Wing head fasteners: Featuring protruding "wings" for hand tightening, wing head fasteners are suitable for applications requiring frequent adjustments.

7. Rolling-element bearing - Wikipedia

   en.wikipedia.org/wiki/Rolling-element_bearing

   Roller bearings are the earliest known type of rolling-element-bearing, dating back to at least 40 BC. Common roller bearings use cylinders of slightly greater length than diameter. Roller bearings typically have a higher radial load capacity than ball bearings, but a lower capacity and higher friction under axial loads.