300 series stainless steels (such as 303, 304 or 316) are an austenitic stainless steel with excellent corrosion resistance properties. 300 series stainless steels can not be hardened for improved load capacity or wear resistance. Power Transmission Solutions offers mounted ball bearing units made with 300 series stainless steels. 316 stainless steel has the highest corrosion resistance available in Power Transmission Solutions bearing housings.