The SKF 51100 is a single-direction thrust ball bearing with a 10mm inner diameter, 24mm outer diameter, and 9mm thickness. Made of GCr15 high-carbon chromium steel with a pressed steel cage, it withstands unidirectional axial loads only. Ideal for low-speed applications requiring high axial positioning accuracy (e.g., machine tool lead screws, automotive clutches, valve push rods), it offers a compact design, high axial rigidity, and low cost.