Deep Groove Ball Bearings 2.material bearing steel GCR - 15 3.Quality authentication ISO 9001:2000 4.Hardness 62-65 carbon steel price ... , 6300, 6400, 62200, 62300, 6900,16000,etc. Ring MaterialChrome Steel ,Carbon steel,bearing steel Tolerance gradeGB/T307.1-205 ID Size ... and gland 6.Noise inspection 7.Appearance inspection low noise!!! carbon steel price per kg 61804