SNR Industry 199 SNR ball bearing unit range The ball bearing units presented in this catalogue are composed of housings made of Thermoplastic PBT and bearing inserts of stain- less or chrome steel. The units can be equipped with protective caps of SR50 (Polypropylen), open with 2-lip seal for passing shafts or closed for shaft ends.. The bearing units are used, among other areas, in the food- and pharmaceutical industries with their high demands for hygiene and corrosion resistance of the material used. For this reason all bea- ring units are lubricated with grease in accordance with the USDA H1 standard. Currently this standard places the most stringent requirements on the hygiene and purity of the materials used in the lubricant. Corrosion-resistant SNR ball bearing units with thermoplastic housings SNR ball bearing units of stainless steel SNR ball bearing units made of stainless steel are used, among other areas, for applications with high requirements for the cor- rosion resistance of the components. In these applications with severe operating conditions, as e.g. high humidity or direct contact with agressive media, conventio- nal bearing units meet the requirements insufficient or not at all. SNR takes these special applications into account with an exten- sive standard range of ball bearing units made of stainless steel. Furthermore SNR meets the requirements of the pharmaceutical- and food-industries according to USDA H1 (high purity of the raw materials used in the lubricant) by filling all inserts of SNR stain- less steel bearing units exclusively with grease according to this specification.