Radial growth test is conducted for quantifying diametrical or radial growth of high RPM rotating parts. The forces on rotating parts grow alarmingly fast as rotational speed increases in any high speed rotating equipments. This can lead to substantial diametrical growth, which must be taken into consideration during the design, particularly, if touching a nearby stationary component is possible. It is a recent test done for a high-speed motor manufacturer. This test helps the customer's engineers to balance the flux density, manufacturing tolerances and material selections to optimize the motor/stator air gap.

Radial Inflow Turbines are used in turbochargers with capacities up to about 1000 HP. It has a nozzle to direct the flow of gases to turbine wheel at the best possible angle. The incoming fluid usually passes through a set of nozzles that cause the fluid to swirl and thereby entering the turbine rotor at the proper relative velocity. The flow then continues through the rotor where it continues to expand and impart energy to the rotor. The fluid then leaves the rotor near the rotational centerline. The blade angles at the rotor exit are designed to remove exit swirl as the fluid leaves the machine. This minimizes the energy in the exhaust flow thereby increasing the turbine efficiency. In some designs the inlet nozzles are replaced with an inlet scroll sized to provide the swirl to the rotor. The most common application for the radial inflow turbine is the exhaust driven turbocharger used on internal combustion engines.

Radial jet aerators allocate jets uniformly around the circumference of a central, pressurized, tank type chamber. The jet manifold is used in large scale applications, and the radial aerators are limited to smaller scale biological processes utilizing circular tanks. It is used for municipal and industrial wastewater treatment.

Radial shaft seals are used to seal rotary elements, such as shaft or rotating bore. The common of these shaft seals include strut seals, hydraulic pumps seals, axle seals, power steering seals, and valve stem seals. The seal construction consists of a sprung main sealing lip, which has a point contact with the shaft. The point contact is formed by two angles, with the air side angle usually less than the oil side angle. Depending on the seal type these two angles are varied to create a pressure distribution at the seal contact point, which has a steeper slope on the oil side of the seal.