The SKF 51101 is a single-direction thrust ball bearing with a 12mm inner diameter, 26mm outer diameter, and 10mm 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., precision instrument lead screws, small machinery axial supports, automotive components), it offers a compact design, stable axial load capacity, and easy installation.