Annular ball bearings are precision type ball bearings, which provide full-length support across the wheel width. The outside races are locked to the inside race by ball bearings and unique encapsulated raceway. They are ideal for light to medium duty. Side thrust load rating is approximately 20% of radial capacity.

Annular flow silencer is an absorptive silencer, which contain fibrous packing materials that control noise by absorbing noise energy. As the sound waves pass through the spaces between the tightly packed small-diameter fibers of the absorptive material, the resulting viscous friction dissipates the sound energy as small amounts of heat. Annular flow silencers are highly effective on high-frequency noise (500-8000 Hz). At frequencies above and below this range, attenuation performance progressively diminishes. Since the noise is absorbed by the packing media, this silencer does not rely on internal baffles, tubes or other restrictive devices to achieve noise reduction. The design of this silencer features a bullet centered in the flow tube to provide annular flow path, partial blocked-line-of-sight and the internal designs impose very little restriction to air flow.

Annunciators are electrical signaling devices, used in hotels or offices to indicate the sources of calls on a switchboard. It is an indicator that announces which electrical circuit has been active (as on a telephone switchboard). It annunciates the status of industrial processes, security and fire alarms of buildings. It may come in any combination of visual indication and/or audio alarms. A visual indication may be provided by a graphic display panel lit with lamps or bulbs, a digital display like that of an LED or LCD, or a computer or video monitor. These annunciators also include mosaic graphic displays, and control graphic displays. Audio alarm annunciators include air horns, sirens, bells, buzzers, speakers (for a paging system or voice evacuation), whoop sounders or hooters.