Precision CNC machine tool spindles, screw air compressor hosts, hydraulic piston pumps, high-speed speed-increasing gearboxes and turbo blowers belong to high-end precision transmission equipment. Support positions of angular contact ball bearings operate under harsh long-term conditions: combined alternating radial and axial loads, prolonged continuous high-speed rotation, operational heat generation, axial preload assembly, variable load directions and strict requirements for rotational accuracy, vibration and noise indicators. Single-row bearings only sustain unidirectional axial force; most practical working conditions require paired assembly to realize bidirectional axial restriction. Ordinary angular contact bearings often suffer insufficient sorting precision of steel balls, inconsistent superfinishing quality of raceways, excessive frictional heat at high speed and large dispersion during matching. Premature pitting easily occurs under preload. Once bearing precision declines, machining accuracy of machine tools drops and vibration of air compressors exceeds limits, directly impairing overall machine performance. Accurate matching and stable high-speed performance become core selection criteria for high-end equipment.

Focusing on R&D and manufacturing of high-speed precision bearings, Japan NMT launches 7000 series angular contact ball bearings to solve industry pain points of traditional models including excessive temperature rise at high speed, large dispersion after matching, fatigue damage under preload and insufficient wear resistance of seals. Adopting optimized raceway design with inclined contact angle, combined with five core upgrades including high-purity bearing steel, high-precision graded steel balls, low-friction cages, standardized matching screening process and multiple contact angle & sealing options, single units bear unidirectional axial loads. Pre-matched sets in DB, DF, DT configurations are available. Multiple contact angles (15°,25°,30°,40°) cover light-load high-speed to medium-heavy load conditions. Widely applied to machine tool spindles, air compressors, pumps and high-speed gear transmission equipment, the bearings optimize contact tracks, reduce frictional heat at high speed and maintain long-term stable rotational accuracy.

Core Product Advantages

1. Combined radial & axial load capacity with flexible matching options: Inclined contact structure bears radial loads and unidirectional axial loads simultaneously. DB back-to-back arrangement delivers high rigidity; DF face-to-face arrangement provides excellent alignment performance; DT tandem layout suits heavy axial loads. Assembly forms can be selected flexibly according to shaft force conditions.

2. Multiple contact angles available to meet different speed & load demands: Universal 25° AC balances rotational speed and axial load capacity; 15° C variant fits high-speed light-load machine tool spindles; 30° A and 40° B types feature stronger axial load capacity for pumps and gearboxes with large axial thrust.

3. Super-finished raceways for low vibration and low noise at high speed: Inner and outer ring raceways undergo superfinishing with excellent surface roughness. Steel balls are strictly sorted by dimension to achieve smooth rolling contact, effectively restraining high-speed vibration and temperature rise, ideal for continuous high-speed operation of precision processing equipment.

4. Professional pre-matching process with high consistency under preload: Bearings can be supplied as single units or pre-selected matched sets upon customer request, eliminating clearance dispersion between pairs, ensuring uniform preload among multi-bearing arrangements and avoiding premature failure caused by partial overload.

5. Diverse structural specifications with various seals and cages: Open type and 2RS rubber sealed versions optional; pressed nylon cages adapt to high-speed low-heat conditions; solid brass cages fit high-temperature and impact environments. Multiple precision grades P0/P6/P5/P4 satisfy requirements from general machinery to high-end precision spindles.

Application Scenarios

Precision spindle supports for CNC lathes, machining centers and grinding machines; main bearings of screw and scroll air compressors; main shafts of piston pumps, gear pumps and hydraulic motors; high-speed speed increasers and textile high-speed spindles; rotary supporting positions of turbo blowers, refrigeration compressors and precision testing instruments.

Precision Quality Assurance

NMT angular contact ball bearings are manufactured strictly according to Japanese precision bearing standards. Raw materials undergo flaw detection. Tests including high-speed temperature rise durability test, matching consistency inspection, preload fatigue test, vibration & noise measurement and precision stability test under hot-cold cycles are carried out. Featuring stable high-speed operation, excellent precision retention and controllable matching tolerance, the bearings fully adapt to long-term high-speed combined load operation of precision machine tools, air compressors and pump equipment.

Product Range

7000,7200,7300,7400 series angular contact ball bearings; contact angles 15°/25°/30°/40°; open type & 2RS sealed type; nylon cages, solid brass cages; precision grades P0/P6/P5/P4; available as single units or pre-matched DB/DF/DT sets, customized non-standard sizes supported.

Brand Strength

Japan NMT focuses on R&D and manufacturing of high-speed precision angular contact ball bearings, specializing in core technologies including raceway superfinishing, high-speed friction optimization, matching sorting control and low-vibration heat treatment. Supported by ultra-precision grinding production lines and high-speed vibration simulation laboratories, NMT solves common industry pain points such as excessive heat generation, precision degradation and inconsistent matching of angular contact bearings used in machine tools and air compressors, supplying high-speed, low-vibration and pre-matched angular contact ball bearing solutions for global precision equipment manufacturers.