NSK offers a wide lineup of super precision angular contact ball bearings to provide optimal specifications for your application. Our bearings provide the perfect solution for equipment requiring high running accuracy or high rotational speed, such as the main spindles of machine tools. Lineup Highlights Standard bearings that conform to ISO standards and specialized series for machine toolsSealed bearings with prepacked greaseA range of NSKROBUST™ high-performance bearings for both high rigidity and ultra-high speeds Standard Series High-Precision Angular Contact Ball Bearings NSK's standard super precision angular contact ball bearings conform to ISO standards. Features Long-life materialsNSK's Z steel, a long-life bearing steel, is used as standard material. Seals for even longer lifeSeries 70 and 79 offer over 1.5x longer grease life than that of open bearings thanks to the included seals. Cage optionsTwo types of cages are available to suit your application. NSKROBUST Ultra-High-Speed Angular Contact Ball Bearings NSKROBUST bearings were developed using NSK’s flagship material, evaluation, and analysis technologies and offer especially high performance in machine tools. Sealed options allow for even longer life, improving machine tool reliability. These features reduce impacts on the environment and help to save energy. Features High speedsThe NSKROBUST Series reduces heat generation and achieves high-speed rotation. Long lifeX-type bearings feature heat- and wear-resistant SHX steel for long life in high-speed applications. Wide lineupA variety of contact angles and ball materials meet needs across applications. Sealed options for even longer lifeA wide range of sealed types offer 1.7x longer grease life than that of open bearings. NSKROBUST Spinshot II Ultra-High-Speed Angular Contact Ball Bearings with Oil-Air Lubrication Spinshot II bearings further optimize lubrication to achieve remarkably quiet operation with ultra-high-speed rotation. Features Oil-air lubrication realizes extremely high speedsSpinshot II bearings support speeds up to 40,000 min-1 using oil-air lubrication with NT#40 tooling. Quiet operationNoise levels reduced by 3-5 dB compared to conventional oil-air lubrication. NSKROBUST BSR Series Ultra-High-Precision Angular Contact Ball Bearings The BSR Series provides high precision and ultra-high speeds for shaft diameters of 25 mm or less. This high-performance line is designed to support compact machine tool spindles. Features Ultra-high speedsBSR Series bearings are specialized to meet the ultra-high speeds required by small machine tool spindles. Long lifeX-type bearings feature heat- and wear-resistant SHX steel for long life in high-speed applications. High precisionHigh-precision specifications come standard. NSKROBUST High-Speed Angular Contact Thrust Ball Bearings NSKROBUST angular contact ball bearings sustain axial loads under high speeds and with high rigidity. Features High rigidity/low heat generationThe BTR Series features a contact angle of 40° for both high thrust rigidity and low heat generation. High speedsThe BAR Series features a contact angle of 30° for a boost in high-speed performance. TAC-F Series Highly Rigid Angular Contact Thrust Ball Bearings TAC-F Series angular contact ball bearings are designed to receive axial loads with a particular focus on rigidity. Features High rigidityA contact angle of 50° is used to enhance rigidity, perfect for highly rigid spindles operating under heavy-duty cutting applications. User friendlyAn inseparable design makes these bearings easy-to-handle.