Angular contact ball bearings are core precision bearings for high-end precision transmission and high-speed spindle systems. Featuring an inclined contact structure between steel balls and raceways, they can bear combined radial and unidirectional axial loads with outstanding advantages of high limit speed, superior positioning accuracy, sufficient rigidity and ultra-low vibration. Different from ordinary deep groove ball bearings that only bear single radial load, the angular contact structure effectively eliminates axial play and spindle offset during high-speed operation. The bearings can be used singly or installed in DB/DF/DT paired combinations, serving as standard precision bearings for CNC machine tools, high-speed drilling and tapping centers, precision grinders, servo spindles and high-end automated equipment.

NMT angular contact ball bearings cover a full range of specifications, including 7000 ultra-thin light-duty series, 7200 general high-speed series and 7300 heavy-duty reinforced series. Multiple contact angle options (15°C, 25°AC, 30°A, 40°B) are available. Larger contact angles provide stronger axial load capacity and higher rigidity to match different speed, load and precision requirements. Open type and 2RS double rubber sealed type are fully supplied. Precision grades include P0 industrial grade, P6 high-speed grade, P5 machine tool precision grade and P4 ultra-precision spindle grade, fully adapting to ordinary processing, precision processing and ultra-high-speed precision processing scenarios.

Three mainstream pairing modes (DB back-to-back, DF face-to-face, DT tandem) realize light, medium and heavy preload effects, perfectly solving high-speed spindle jitter, axial play, insufficient rigidity and precision drift problems. Widely applied in high-precision transmission scenarios requiring high-speed rotation, precise positioning, low noise, low vibration and composite load bearing, NMT angular contact ball bearings deliver balanced performance in compatibility, stability and precision for high-end spindle systems.

Performance comparison: Compared with deep groove ball bearings, NMT bearings possess independent axial load capacity with greatly improved high-speed anti-offset and anti-play performance, multiplying spindle positioning accuracy and eliminating high-speed spindle shaking and positioning deviation. Compared with cylindrical roller bearings, they feature lower friction resistance, higher limit speed, lower temperature rise and better mute effect, suitable for long-term ultra-high-speed continuous operation. Compared with tapered roller bearings, they avoid rigid preload friction loss, providing stronger high-speed stability and better precision retention without high-temperature stalling or precision attenuation, specializing in high-end precision high-speed equipment.

CNC spindles, high-speed drilling machines, precision grinders and servo motor spindles operate long-term under harsh conditions including ultra-high speed, high-frequency start-stop, micro composite load, continuous long-hour operation and repeated precision positioning. Inferior angular contact ball bearings suffer from rough raceway processing, large steel ball roundness deviation, non-standard contact angles, low-precision cages and unstable heat treatment, easily causing excessive spindle runout, machining dimension deviation, abnormal noise, rapid temperature rise and excessive vibration during high-speed operation. Long-term use leads to permanent spindle precision attenuation, reduced product yield, premature bearing wear and seizure, frequent equipment shutdown and increased production and maintenance costs.

NMT angular contact ball bearings are made of high-purity vacuum-degassed bearing steel with integral uniform quenching and low-temperature tempering stabilization, featuring dense structure, uniform hardness and minimal thermal deformation. Inner and outer raceways adopt nano-level ultra-precision mirror grinding for smooth and accurate tracks. Equipped with G5 ultra-precision steel balls with minimal roundness error and high dimensional consistency, and calibrated standard contact angles, the bearings ensure uniform stress, smooth rotation and no partial wear during high-speed operation.

Multiple high-precision cage configurations are optional: nylon cages are lightweight, low-friction and low-noise for conventional high-speed mute processing; bakelite cages feature high temperature resistance and deformation resistance for ultra-high-speed continuous operation; copper alloy solid cages provide higher rigidity, fatigue resistance and impact resistance for high-precision, high-load and high-frequency start-stop spindle conditions. 2RS sealed versions adopt high and low temperature resistant nitrile rubber seals with tight fitting performance, effectively preventing dust, debris and oil pollution from entering the bearing interior, avoiding raceway scratch and steel ball wear and greatly extending service life.

All NMT paired angular contact bearings undergo factory clearance sorting, preload matching, coaxiality calibration and high-speed running-in tests with minimal pairing error and stable uniform preload. After installation, the spindle operates without play or offset, featuring low vibration and low temperature rise, maintaining stable precision without drift or attenuation during long-term high-speed operation. With controllable temperature rise and small thermal expansion, the bearings ensure repeated positioning accuracy and machining consistency of machine tools, fully meeting 24-hour uninterrupted precision mass production requirements.

As the precision processing industry upgrades toward high speed, high precision, low vibration, long service life and maintenance-free operation, ordinary low-grade angular contact bearings with poor precision, unstable preload, excessive high-speed heat, large vibration and short service life can no longer meet the production standards of high-end machine tools and precision automation equipment. With four core process advantages, NMT solves major industry pain points and provides stable, long-lasting and high-precision spindle bearing solutions for high-end precision equipment.

Core Product Advantages

1. Inclined contact composite load structure bears radial and axial loads simultaneously with sufficient rigidity and excellent high-speed anti-offset and anti-play performance.

2. Full coverage of multiple contact angles with clear gradient, accurately matching axial rigidity and load capacity for light, medium and heavy loads.

3. Ultra-precision mirror raceway and high-precision steel balls ensure low friction coefficient, high limit speed and low temperature rise for stable long-term high-speed operation.

4. Optional multi-material cages adapt to full-scenario working conditions such as normal temperature high speed, high temperature ultra-high speed, mute precision and high-frequency start-stop.

5. Original factory precision pairing technology with complete DB/DF/DT pairing modes ensures high coaxiality, uniform preload, zero spindle play and zero positioning deviation.

6. Low-vibration mute precision design ensures smooth operation without stalling or harsh abnormal noise, improving the stability and quietness of precision processing equipment.

7. Stable heat treatment process minimizes thermal deformation, avoiding thermal offset at high speed and maintaining long-term precision stability.

8. Standard universal dimensions ensure strong replacement compatibility for direct replacement of old and new machine tools and spindle equipment without structural modification.

Typical Application Scenarios

Precision machine tool equipment: Spindle systems of CNC lathes, vertical machining centers, high-speed drilling and tapping machines, precision grinders and engraving machines; High-speed power equipment: Core supporting structures of high-speed servo spindle motors, variable-frequency high-speed motors and precision industrial motors; Automated precision equipment: Precision manipulators, rotary worktables, precision transmission modules and automated precision rotary mechanisms; Precision instrument equipment: High-end testing instruments, precision experimental equipment and high-precision rotary transmission devices; General precision machinery: High-speed textile machinery, precision printing equipment, high-end gearboxes and precision general transmission equipment.

Quality Assurance

NMT angular contact ball bearings adopt high-purity special bearing steel with multiple stabilized heat treatment processes, featuring uniform hardness, stable structure, excellent fatigue resistance and wear resistance. All products pass full-process quality inspection including ultra-precision grinding, precision grading, clearance screening, high-speed running-in, temperature rise durability and noise detection, eliminating all defective products with poor precision, excessive vibration, abnormal temperature rise and pairing deviation. Compatible with long-term grease lubrication and micro high-speed lubrication, the operating temperature ranges from -30℃ to 125℃, adapting to ultra-high speed, high-frequency start-stop and 24-hour continuous precision operation with long-term stable precision and longer service life than ordinary domestic bearings.

Product Range

7000 ultra-thin light-duty series, 7200 general high-speed series, 7300 heavy-duty reinforced series; Contact angles: 15°C, 25°AC, 30°A, 40°B; Pairing modes: DB back-to-back, DF face-to-face, DT tandem; Structural types: OPEN open type, 2RS double rubber sealed type; Precision grades: P0 general industrial grade, P6 high-speed grade, P5 precision machine tool grade, P4 ultra-precision spindle grade; Applicable conditions: ultra-high-speed rotation, precise positioning, low vibration and mute, composite load precision transmission.

Brand Strength

NMT Japan focuses on the R&D and manufacturing of high-end precision high-speed bearings, specializing in machine tool spindle supporting fields. It solves common industry pain points of ordinary angular contact bearings such as high-speed jitter, inaccurate positioning, excessive temperature rise, pairing deviation, fast precision attenuation and short service life. With four core technologies including ultra-precision mirror grinding, standard contact angle calibration, precision steel ball sorting and stable heat treatment, NMT develops high-precision, high-stability, low-vibration and long-life angular contact ball bearings specially for machine tool spindles. Supplying in bulk for machine tool manufacturers, spindle factories, automation equipment manufacturers and precision equipment maintenance enterprises, NMT stabilizes equipment machining accuracy, reduces product defect rates, cuts equipment failure downtime and comprehensively lowers enterprise production and operation costs.