Rack and pinions can be constructed in nearly unlimited lengths. . Rack and pinion systems can operate in one of two ways: with the pinion moving and the rack stationary or with the pinion assembly stationary and the rack moving.

The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passing over it.A chain is a serial assembly of connected pieces, with an overall character similar to that of a rope in that it is flexible and curved.

An ‘o’-ring, also known as a packing or a toric joint. An O-ring is one of the simplest, yet highly critical, precision mechanical components ever developed. O-ring selection is based on chemical compatibility, application temperature.

spiral bevel gear have curved oblique teeth that contact each other gradually and smoothly from one end of the tooth to the other, meshing with a rolling contact similar to helical gears.