Bearing Rings For spindle bearings and other demanding applications, such as medical devices and food processing, the highly corrosion-resistant nitrogen alloy steel X30CrMoN15-1 (HQW designation 30X) can be used. This highly-refined stainless steel has a very fine grain structure which enhances its mechanical properties. Advantages of 30XLonger lifetime in comparison to conventional materials.Maximun corrosion resistance.Improved mechanical properties due to vert fine structure.Quiet running.High temperature resistance of up to 300?.High chemical resistance.30X ApplicationsMachine tool spindles.Medical technology.Vacuum technology.Aerospace.Measurement and control technology.Food and beverage industry.Corrosion ResistanceThe graph below illustrates the degree of corrosion over time for the high-performance material SV30 (30X), compared with traditional bearing steels 100Cr6, 9Cr18 and X65Cr13. Balls for Bearings The balls used in HQW bearings are usually made of stainless steel (X65Cr13). However,for particularly arduous applications, many of our bearings are fitted with ceramic balls made from silicon nitride (Si3N4). Only balls of grade 3 and 5 are used for HQW spindle bearings. These classes comply with the highest tolerances in terms of size, roundness and roughness. Bearing Cages The cage separates the balls to prevent them coming into contact and thus ensuring an even load distribution within the bearing. HQW bearings have a window cage made of fabric rein-forced phenolic as standard. If required, cages can also be produced from high-performance plastics such as PEEK or Torlon®. These materials are used on account of their low weight,their corrosion resistance and low friction The low friction properties result in reduced wear and less heat generation, which make the bearings more suited to higher speeds whilst prolonging grease service life. - Advantages of Machined Window Cages compared with Molded and Steel Cages- High Precision- Larger choice of materials- Flexible designs which can be manufactured quickly- Economic production of small to medium batches- Longer lifetime- High speeds