The SKF 51105 is a single-direction thrust ball bearing with a 25mm inner diameter, 42mm outer diameter, and 11mm thickness. Made of GCr15 high-carbon chromium steel with a pressed steel cage, it withstands unidirectional axial loads only. Ideal for low-speed, high-precision axial positioning applications (e.g., machine tool lead screws, automotive steering knuckles, automation equipment axial supports), it offers a compact design, high axial rigidity, and easy installation.