Angular contact ball bearings act as core precision rotary supporting components, widely applied in CNC machining center spindles, screw air compressors, hydraulic pumps, high-speed reducers and robot joints. The contact angle formed between raceways and steel balls enables simultaneous bearing of radial loads and unidirectional axial loads. In practical engineering, back-to-back, face-to-face and tandem matching combinations are commonly adopted to withstand bidirectional axial force, perfectly matching rotary mechanisms subject to combined radial and axial loads. Compared with deep groove ball bearings, angular contact ball bearings deliver stronger axial load capacity. In contrast to roller bearings, they possess superior high-speed performance and better vibration control. Classified by contact angle, the product range includes 7000C, 7000AC and 7000B variants. Larger contact angles bring higher axial load capacity yet relatively lower limiting speed. High-end precision equipment pursues continuous improvement of machining accuracy and operating efficiency. Spindles need minimal runout during high-speed rotation. Insufficient bearing rigidity or excessive accuracy deviation will directly cause rough machining textures and oversized dimensional errors on workpieces. Ordinary angular contact ball bearings on the market suffer defects including insufficient raceway machining precision, low steel ball classification grades and loose control over matching tolerances. They generate excessive temperature rise at high speed and tend to experience accuracy decline and aggravated vibration after long-term operation, failing to satisfy long-term stable operation requirements of precision machine tools and high-speed fluid equipment. NMT Angular Contact Ball Bearings feature complete product portfolio. Single bearings and pre-matched DF/DB/DT assemblies are both available. Open and dust-proof sealed types are fully supplied, with precision grades ranging from standard class, P6, P5 to P4 precision class, meeting diversified demands of general industrial equipment and high-end precision machinery.

With the advancement of intelligent manufacturing, CNC equipment and high-speed fluid machinery continuously lift spindle rotating speed and processing load. Complete machines impose strict standards on bearing rigidity, rotational precision and high-speed thermal stability. Machine tool spindles switch repeatedly between heavy cutting and high-speed finishing conditions. Bearings endure alternating combined loads and generate abundant heat during operation. Poor internal friction control will lead to continuous temperature rise, triggering spindle thermal deformation and reducing machining precision. Air compressors and vacuum pumps run nonstop for extended periods. Oil-gas mixtures exist inside equipment, and tiny impurities easily penetrate bearing clearances and accelerate abrasion on rolling contact surfaces. Some low-end bearings adopt cages with inadequate structural strength. Cage shake under high-speed conditions induces vibration and noise. Loose control over matching assembly tolerances causes uneven force distribution on paired bearings, resulting in local stress concentration and premature fatigue pitting. Machinery manufacturers are in urgent need of precision angular contact ball bearings featuring high rotational accuracy, high rigidity, low heat generation and excellent fatigue resistance. Optimized with revised raceway profile and contact angle parameters to disperse contact stress reasonably, NMT Angular Contact Ball Bearings adopt high-precision graded steel balls paired with mirror superfinished raceways to cut high-speed friction loss. Strict control over matching assembly tolerances guarantees even load distribution and effectively suppresses temperature rise and vibration at high rotation speed, delivering stable and reliable supporting solutions for various high-speed precision rotary equipment.

NMT Angular Contact Ball Bearings consist of inner ring, outer ring, high-precision steel balls and cages. Relying on contact angles, they support combined radial and unidirectional axial loads. Different contact angle models serve distinct purposes: Type C with small contact angle achieves high limiting speed and suits high-speed light-load scenarios; Type AC balances rotating speed and axial load capacity with the widest application scope; Type B owns larger contact angle and outstanding axial bearing performance for heavy axial load conditions. Bearings support multiple matching installation modes. Back-to-back DB pairing provides stronger stiffness against overturning moment, commonly used for machine tool spindles. Face-to-face DF pairing enables convenient installation and fits equipment with moderate coaxiality requirements. Tandem DT pairing enhances unidirectional axial load capacity and is widely adopted in screw air compressors. Cages are divided into stamped steel cages, solid phenolic cages and nylon cages. Solid cages feature stable structure and strong resistance to centrifugal force, prioritized for ultra-high-speed precision working conditions. High-precision bearings undergo strict pre-grouping. Single-unit runout indicators are controllable, and pre-matched assemblies can be directly installed without on-site lapping. The products are extensively equipped on CNC lathe spindles, machining center spindles, screw air compressors, vacuum pumps, high-speed hydraulic pumps, high-speed textile spindles and rotary joints of automated robots.

Inner rings, outer rings and steel balls are manufactured from high-purity refined bearing steel. Multiple forging procedures refine internal grain structure. Precise quenching and tempering achieve qualified hardness on rolling contact surfaces while the matrix retains sufficient toughness to resist impact from alternating loads. Multiple superfinishing processes are conducted on inner and outer raceways to reduce surface roughness and relieve frictional heat during high-speed rotation. All finished bearings pass dimensional precision inspection, end runout testing, clearance screening, high-speed temperature rise test and vibration noise detection. Matched bearings receive additional paired tolerance verification. Products failing precision standards are eliminated to guarantee consistent performance in mass production.

Multiple options of contact angles, clearances and precision grades are available. Standard overall dimensions deliver favorable industry interchangeability for convenient component replacement and upgrading on equipment.

Core Product Advantages

Unique contact angle structure withstands radial loads and unidirectional axial loads simultaneously. Multiple matching modes realize bidirectional axial bearing capacity for combined load working conditions;

Rich contact angle variants including C/AC/B series cover high-speed light-load, general and heavy axial load applications;

Single bearings and pre-matched assemblies are supplied with mature DB, DF, DT pairing schemes to shorten equipment assembly and commissioning cycle;

Mirror superfinished raceways matched with high-precision sorted steel balls achieve low operational vibration and minor temperature rise at high speed, maintaining stable spindle precision in long-term service;

Cages in diverse materials optional. Solid cages excel in centrifugal force resistance, suitable for ultra-high-speed precision spindle equipment;

Complete precision grade coverage from standard class to P4 precision class, satisfying demands of general machinery and high-end precision CNC machine tools;

High steel purity and stable heat treatment ensure good fatigue resistance of rolling contact surfaces for long-time continuous equipment operation;

Standard overall dimensions with excellent interchangeability for convenient assembly during maintenance and renovation of new and old equipment.

Typical Application Scenarios

Precision spindle units of CNC lathes, machining centers and grinders; screw air compressors, vacuum pumps, booster pumps; high-speed hydraulic pumps and fluid conveying equipment; high-speed textile spindles; rotary joints of automated industrial robots; small high-speed gear reducers; precision rotary mechanisms of testing instruments.

Quality Assurance

Raw materials of NMT Angular Contact Ball Bearings receive sampling inspection on hardness, metallographic structure and non-metallic impurities upon warehousing to control raw material quality fundamentally. Forged blanks of inner and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and mirror superfinishing of raceways. Steel balls are grouped and screened according to high precision grades to guarantee uniform rolling stress. Matched bearings follow independent tolerance matching procedures to strictly control end runout difference between paired units. Cages and sealing components are inspected before assembly to ensure assembly precision. All finished goods go through visual inspection, radial clearance screening, runout detection and long-time high-speed temperature rise durability test. High-precision bearings dedicated for machine tool spindles undertake additional high-speed preload simulation tests. Non-conforming products are separated independently. Every angular contact ball bearing delivers precise rotation, stable temperature rise and reliable fatigue resistance, effectively lowering risks of precision degradation and unplanned shutdown failures of high-end precision equipment.

Product Range

Open angular contact ball bearings, sealed angular contact ball bearings; multiple contact angles including 7000C, 7000AC, 7000B; single bearings, DB/DF/DT matched bearings; stamped cages and solid cages optional; complete precision grades: standard, P6, P5, P4. Model selection depends on load ratio, rotating speed, rigidity requirement and preload method.

Brand Strength

NMT focuses on R&D and manufacturing of angular contact ball bearings. Targeting operating characteristics including combined loads and continuous high-speed operation on precision machine tool spindles and high-speed air compressors, NMT continuously optimizes raceway curve design, superfinishing technology and matching assembly standards. The bearings solve industry pain points such as excessive temperature rise at high speed, rapid precision attenuation and uneven stress on matched bearings, help high-end equipment manufacturers improve overall machining performance and extend equipment overhaul intervals.