The SKF 51103 is a single-direction thrust ball bearing with a 17mm inner diameter, 30mm outer diameter, and 12mm thickness. Constructed from 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., printing machinery shaft ends, small gearbox axial supports, automation equipment adjustment mechanisms), it offers a compact design, stable axial load capacity, and resistance to light impacts.