Angular contact ball bearings consist of inner ring, outer ring, steel balls and cages. Contact angles are formed on inner and outer raceways, enabling simultaneous bearing of radial loads and unidirectional axial loads. In practical application, two or more bearings are often matched and combined to resist bidirectional axial force. Benefiting from the unique contact angle structure, the bearings maintain excellent rigidity and superior positioning accuracy under high-speed working conditions, serving as core supporting components for various precision transmission devices and high-speed spindle equipment. They are widely applied in numerically controlled machine tool spindles, hydraulic oil pumps, industrial robot joints, precision reducers, screw air compressors, high-speed pumps, testing instruments and other high-end equipment requiring strict standards on rotation accuracy and operating rigidity. Compared with deep groove ball bearings, angular contact ball bearings feature stronger axial load capacity and higher supporting rigidity, yet they cannot bear bidirectional axial loads independently and generally need to be installed in pairs. Different from tapered roller bearings, they have lower rolling friction resistance and higher limiting rotating speed, making them more suitable for high-speed precision scenarios with slightly lower load capacity than roller bearings. CNC processing equipment, automated robots and high-speed fluid pumps operate continuously at high speed for a long time, bearing radial force and alternating axial thrust during operation. Tiny deformation of spindle systems will directly affect product processing accuracy. Ordinary general bearings suffer insufficient axial bearing capacity, prone to axial play and excessive temperature rise at high speed, leading to rapid attenuation of overall machine accuracy. Conventional angular contact ball bearings on the market usually have defects including insufficient grinding precision of raceways, large tolerance of steel ball grouping and poor end face parallelism. Uneven stress occurs when used in pairs, and long-term high-speed cyclic operation easily causes aggravated vibration and early fatigue wear. NMT Angular Contact Ball Bearings own complete product categories with multiple contact angle specifications, open and sealed structures optional, stamped steel cages and brass cages available. Multiple matching forms including single set, DB back-to-back arrangement, DF face-to-face arrangement and DT tandem arrangement can be provided. Sizes cover small and medium precision specifications, fully meeting high-precision supporting demands of precision machine tools, automated equipment and fluid machinery.

With continuous upgrading of intelligent manufacturing industry, CNC machine tools, multi-joint industrial robots and high-speed screw pumps are continuously iterated toward higher rotating speed, superior positioning accuracy and lower vibration. Plenty of precision transmission units own compact internal space, requiring bearings to balance radial and axial composite load capacity, maintain stable accuracy during long-term operation and minimize maintenance frequency. Many ordinary angular contact ball bearings adopt loose processing control standards with high dimensional dispersion of rolling elements and uneven load distribution after paired assembly. Micro defects on raceway surfaces easily trigger stress concentration and pitting damage under continuous alternating loads. High-end equipment manufacturers are in urgent need of precision angular contact ball bearing solutions with stable accuracy grade, controllable temperature rise at high speed and excellent pairing consistency. Optimized with revised raceway contour curve and contact angle design to reasonably improve stress state of rolling elements and reduce contact stress effectively, NMT Angular Contact Ball Bearings adopt strict high-precision steel ball classification and screening standards to narrow dimensional tolerance range. Ultra-precision grinding technology is applied to machine inner and outer raceways and end faces to guarantee bearing pairing accuracy. Optimized internal lubrication space structure suppresses frictional heat at high speed, providing stable and reliable high-precision supporting schemes for all kinds of precision transmission equipment.

NMT Angular Contact Ball Bearings are composed of inner ring, outer ring, steel balls and cages. Raceways are equipped with standard contact angles to bear radial loads and unidirectional axial loads. Multiple paired installation modes can be adopted to undertake bidirectional axial force according to working condition demands. Various contact angles are optional: larger contact angles bring stronger axial load capacity, while models with smaller contact angles adapt better to high-speed conditions. Brass solid cages and stamped steel cages are optional. Brass cages own stronger rigidity for high-speed and heavy-load scenarios, and steel cages feature lightweight structure with better cost performance. Partial specifications are equipped with sealing structures to prevent dust and moisture from entering bearing interior. Precisely processed steel balls cooperate with ultra-fine machined raceways to realize low vibration amplitude during high-speed rotation and long-lasting stable rotation accuracy. All steel balls complete precision grouping and screening before assembly to strictly control dimensional difference and ensure even load distribution on every rolling element. The products are extensively matched on CNC lathe spindles, machining center spindles, hydraulic screw pumps, industrial manipulator joints, precision gearboxes, high-speed centrifugal pumps, optical testing equipment and other precision electromechanical equipment.

Inner rings, outer rings and rolling steel balls are manufactured from high-purity bearing chromium alloy steel. Repeated forging refines internal grain structure. Precise constant-temperature quenching and tempering guarantee qualified hardness on working surfaces of raceways and steel balls while the matrix retains appropriate toughness to resist fatigue damage induced by alternating composite loads. Multiple ultra-precision grinding procedures are carried out on inner and outer raceways and end faces to improve surface finish, facilitate formation of uniform and continuous lubricating oil film and effectively control frictional heat generated during high-speed operation. All finished bearings pass dimensional precision inspection, steel ball grouping verification, clearance detection, long-time high-speed temperature rise durability test and vibration accuracy grading detection. Defective products are eliminated to ensure accuracy consistency of mass bearings.

Various contact angles, cage types and sealing schemes are optional. The bearings follow standard universal outer dimensions with excellent interchangeability for convenient assembly, maintenance and replacement of spare parts on precision equipment.

Core Product Advantages

Raceway structure with contact angle bears radial loads and unidirectional axial loads simultaneously; multiple matching modes realize supporting of bidirectional axial force;

Optimized raceway contour design reasonably disperses rolling contact stress, improves bearing rigidity and effectively inhibits axial play at high speed;

Multiple contact angle specifications optional to balance high-speed performance and axial load capacity, adapting to working condition demands of different precision equipment;

Multiple choices of brass cages and stamped steel cages to satisfy high-speed heavy-load scenarios and economical conventional applications respectively;

High-precision graded steel balls with strictly controlled dimensional tolerance ensure even bearing stress, delay fatigue wear and extend service life;

Ultra-precision grinding applied on inner and outer raceways and end faces delivers high rotation accuracy and low vibration value, guaranteeing long-term stable precision of precision equipment;

Premium bearing alloy steel combined with mature heat treatment achieves outstanding anti-fatigue and wear resistance to adapt to long-time continuous operation of precision equipment;

Standardized outer dimensions support various paired installation forms, widely suitable for precision transmission equipment such as machine tools, robots and pumps.

Typical Application Scenarios

Spindle units of CNC lathes, machining centers, grinders and other machine tools; screw air compressors, hydraulic oil pumps, high-speed centrifugal water pumps; joint transmission parts of multi-joint industrial robots and collaborative robots; precision planetary reducers and supporting parts of servo motors; high-speed spinning equipment and precision optical testing instruments; small turbo machinery and refrigeration compressor spindles; precision transmission components of medical equipment.

Quality Assurance

Raw materials of NMT Angular Contact Ball Bearings receive sampling inspection on hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner rings and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision grinding of raceways and end faces. All steel balls are graded and grouped according to high precision standards to guarantee even load distribution under high-speed alternating loads. Wear resistance and durability tests are conducted on formed cages and sealing components, and additional dust & moisture intrusion simulation tests are carried out for sealed specifications. All finished goods pass visual inspection, clearance screening, geometric precision detection and long-time high-speed vibration & temperature rise durability test. Bearings to be delivered in pairs receive extra pairing accuracy verification. Non-conforming products are separated independently. Every angular contact ball bearing features smooth rotation, stable accuracy and controllable temperature rise, ensuring sustained stable operation of high-end precision equipment.

Product Range

Angular contact ball bearings of multiple contact angle specifications; open type and sealed structure optional; stamped steel cages and brass solid cages optional; supporting DB, DF, DT multiple matching combinations; abundant dimensional specifications covering small and medium precision bearings. Model selection depends on rotating speed, ratio of radial and axial loads, accuracy requirements and working environment.

Brand Strength

NMT focuses on R&D and manufacturing of precision angular contact ball bearings. Targeting working characteristics including high speed, high precision and composite loads for equipment such as CNC machine tools, industrial robots and high-speed pumps, NMT continuously optimizes raceway curves, contact angle parameters and rolling element precision standards. The bearings solve industry pain points such as excessive vibration at high speed, insufficient pairing accuracy and excessive temperature rise during continuous operation, help high-end equipment manufacturers improve equipment processing accuracy, extend maintenance intervals of spindles and transmission components and reduce overall machine operation and maintenance costs.