Angular contact ball bearings form a specified contact angle at the contact points between raceways and steel balls, capable of bearing radial loads and unidirectional axial loads simultaneously. Depending on structural forms, they can be mounted in back-to-back, face-to-face and tandem matched arrangements to withstand bidirectional axial force. Internal axial component force generates during bearing operation, so they are generally assembled in pairs. They are widely adopted in precision machine tool spindles, hydraulic pumps, air compressors, high-speed reducers, precision automation equipment, testing instruments and other devices with strict standards for rotational accuracy and limiting speed. Different from deep groove ball bearings, angular contact ball bearings bear axial thrust relying on contact angles. Larger contact angles bring stronger axial load capacity yet lower maximum allowable rotating speed. Compared with tapered roller bearings, steel balls serve as rolling elements with lower friction resistance, making them more suitable for high-speed precision conditions, while heavy-load performance is relatively weak. Precision processing equipment and high-pressure fluid pumps run continuously at high speed. Rotating shafts endure superposed composite loads of radial force and axial thrust for a long time, and ordinary bearings can hardly stably bear bidirectional alternating axial loads simultaneously. Conventional angular contact ball bearings on the market usually suffer defects including insufficient raceway grinding precision, low steel ball sorting grade and poor dimensional consistency of inner and outer rings. Uneven preload emerges after matched assembly, easily leading to increased vibration, excessive temperature rise and rapid accuracy attenuation after long-term high-speed operation. NMT Angular Contact Ball Bearings own complete product series with various contact angle specifications, open structures, optional nylon cages and steel cages, multiple precision grades and full clearance ranges. Sizes cover small-medium precision specifications and industrial standard dimensions, fully satisfying supporting demands of precision machinery, fluid equipment and automatic production lines.

With continuous upgrading of high-end equipment manufacturing industry, CNC machine tools, high-pressure pumps and precision automatic devices pursue higher processing accuracy and rotating speed. Spindles and rotary mandrels impose extremely high requirements on bearing rotational accuracy, dynamic rigidity and high-speed stability. Many precision transmission structures have compact space. Rotating components are continuously impacted by alternating axial loads during operation, requiring bearings to precisely control clearance and preload. Friction inside bearings easily accumulates heat under high-speed conditions. Poor raceway surface quality causes local high temperature and rapid deterioration of lubricating grease, directly affecting overall processing precision. A large number of ordinary angular contact ball bearings have wide machining tolerance ranges. Preload degree is difficult to unify when used in pairs, and vibration value rises continuously during high-speed rotation. Insufficient operation stability of cages easily triggers abnormal running noise, and rotational accuracy declines gradually after long-term service. Machinery manufacturers are in urgent demand of precision angular contact ball bearings featuring high rotational accuracy, low temperature rise, slight vibration and excellent matching consistency. Optimized with revised curved raceway profile and contact angle design to improve steel ball contact stress distribution and restrain heat generation under high-speed conditions, NMT Angular Contact Ball Bearings adopt strict high-precision steel ball screening procedures to guarantee highly unified dimensions of rolling elements. Upgraded ultra-precision grinding enhances surface finish and geometric accuracy of inner and outer raceways, ensuring balanced preload after paired assembly and providing stable and reliable rotary supporting solutions for all kinds of high-speed precision mechanical equipment.

NMT Angular Contact Ball Bearings consist of inner ring, outer ring, steel balls and cages. The contact angle structure enables bearings to bear radial loads and unidirectional axial loads simultaneously. Bidirectional axial loads can be undertaken via various matching mounting modes. Multiple contact angles are optional to adapt to working conditions with different proportions of axial loads. Nylon cages feature light weight and low friction, suitable for ultra-high speed scenarios; steel cages deliver higher strength and adapt to conditions with impact loads. Precisely sorted steel balls cooperate with ultra-fine raceways to effectively reduce vibration during high-speed rotation and maintain stable rotational accuracy for a long period. All steel balls complete high-precision grouping and screening before assembly to strictly control dimensional errors and guarantee balanced force of matched bearing sets. The products are extensively matched on CNC machine tool spindles, hydraulic oil pumps, screw air compressors, high-speed gearboxes, precision testing instruments, rotary joints of automatic manipulators, high-speed centrifugal equipment and other devices.

Inner rings, outer rings and steel balls are manufactured from high-purity bearing chromium alloy steel. Multiple forging processes refine internal grain structure. Precise constant-temperature quenching and tempering guarantee qualified hardness on working surfaces of raceways and steel balls while the matrix retains reasonable toughness to resist fatigue damage induced by high-speed alternating composite loads. Multiple ultra-precision grinding procedures are carried out on inner and outer raceways to reduce surface roughness and cut frictional heat under high-speed operation. All finished bearings pass dimensional precision inspection, steel ball grouping screening, clearance verification, long-time high-speed temperature rise durability test and vibration grade detection. Unqualified workpieces are eliminated to ensure unified geometric accuracy of mass products and stable performance after matched assembly.

Various contact angles and clearance specifications are optional with standard industry outer dimensions and excellent interchangeability for convenient maintenance and replacement of spare parts on precision equipment.

Core Product Advantages

Unique contact angle structure bears combined radial and unidirectional axial loads; multiple matched mounting modes support bidirectional axial load bearing;

Two cage types including nylon and steel optional, adapting to ultra-high-speed stable operation and impact load conditions respectively;

Ultra-precision raceway grinding achieves high geometric accuracy, low vibration and outstanding temperature control at high speed to sustain rotational accuracy;

High-precision graded steel balls feature small dimensional dispersion, realizing even preload for paired bearings and preventing local stress concentration;

Multiple contact angle specifications available for flexible selection according to axial load magnitude, balancing load capacity and limiting speed;

Complete precision grade configuration meets accuracy demands ranging from general industrial transmission to high-end precision machine tool spindles;

Premium bearing alloy steel combined with stable heat treatment ensures strong dimensional stability, anti-fatigue wear and extends service life of precision components;

Standardized outer dimensions with great versatility for easy replacement and assembly of bearing spare parts for machine tools, pumps and automatic equipment.

Typical Application Scenarios

Spindles of various CNC machine tools and precision rotary units of grinders; high-pressure hydraulic oil pumps, screw pumps and industrial booster pumps; screw air compressors and small high-speed gear reducers; precision measuring instruments and laboratory high-speed rotary devices; rotary joints of automatic manipulators and high-speed indexing mechanisms; centrifugal separation equipment and high-speed precision rotating shafts for textile machinery; various precision fluid machinery and small high-speed turbine transmission assemblies.

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. All steel balls are graded and grouped according to high precision standards to guarantee balanced load distribution of bearings after paired assembly. High-speed operation stability and wear resistance tests are conducted on formed cages. All finished goods pass visual inspection, radial clearance screening, geometric precision detection and long-time high-speed vibration & temperature rise durability test. High-precision models dedicated for machine tool spindles receive additional high-speed preload simulation tests. Non-conforming products are separated independently. Every angular contact ball bearing features stable precision, controllable vibration and low temperature rise at high speed, effectively lowering risks of accuracy attenuation and unexpected shutdown of high-end precision equipment.

Product Range

Open angular contact ball bearings; multiple contact angle specifications; nylon cages and steel cages optional; multiple precision grades and clearance ranges; covering small-medium precision standard sizes. Model selection depends on load ratio, rotating speed, precision requirements and whether paired installation is adopted.

Brand Strength

NMT focuses on R&D and manufacturing of precision angular contact ball bearings. Targeting operating characteristics including composite loads, high rotating speed and long-term maintenance of high precision for machine tool spindles and high-speed pumps, NMT continuously optimizes contact angle design, ultra-precision grinding technology and matching tolerance control standards. The bearings solve industry pain points such as excessive temperature rise at high speed, large vibration and gradual accuracy decline after long-term operation, help precision equipment manufacturers improve overall operation stability and extend maintenance intervals of spindles and rotary components.