Carries axial loads in one direction only, transmitting thrust between a shaft and housing seat without accommodating radial load. The bearing 51234-MP has a height of 55.0 mm and a net mass of 8.132 kg, fitted with a solid brass cage (MP). Limiting speed is rated at 1740.0 1/min, with a reference speed of 2230.0 1/min. The single-direction thrust design means the assembly must be axially preloaded or otherwise constrained, as it cannot support load reversal or radial forces on its own. The solid brass cage keeps ball spacing stable under the stated speed range and supports smooth operation at the given reference speed, making the bearing suitable for mounting where thrust runs consistently in one direction and shaft alignment is fixed.