1209K Self‑aligning Ball Bearing 45×85×19mm 1:12 Tapered Bore Open‑type For Industrial Transmission Equipment Product Overview 1209K is a double‑row open‑type self‑aligning ball bearing with 45×85×19mm dimension. It features a 1:12 tapered inner bore designed for mounting with adapter sleeve. With spherical outer raceway structure, this bearing can actively compensate shaft misalignment and deflection during operation. Made of high‑quality GCr15 chrome steel, it offers stable