Metric Miniature Ball Bearings are also called metric miniature bearings or metric mini bearings. It is one of the classifications under ball bearings . In Runstar, they are usually referred to miniature ball bearings with a metric dimension from a bore diameter of 1mm to 10mm. Runstar has a full metric dimention of stainless steel Metric Miniature Bearings for choice, the stainless steel material can be 440(9Cr18),420(9Cr13),as well as 316 stainless steel for special application. There are SMR series(SMR52-SMR148),S68 series(S681-S689),S69 series(S691-S699),S60 series(S602-S609),S62 series(S623-S629) and S63 series(S633-S639) for metric miniature ball bearing with stainless steel in Runstar. Compared with ordinary metric miniature ball bearing with chrome steel,stainless steel metric miniature ball bearings can keep from corrosion caused by some acids or moisture,and stainless steel metric miniature ball bearings have obvious advantages of stable operation, low noise, low magnet, wide application, excellent anti-corrosion and anti-rust properties.   But stainless steel metric miniature ball bearings are more difficult and strict than ordinary bearings in technology and precision control. They can be widely used in the fields of medical equipment, cryogenic engineering, optical instruments, high-speed machine tools, high-speed motors, printing machinery, food processing machinery etcs. Runstar is a professional stainless steel metric miniature ball bearings manufacturer in china since 2007,certified ISO9001:2015.