Deep groove ball bearings are the most widely used and versatile basic rolling bearings in the industrial field. With an arc deep groove raceway structure, they can bear radial loads and bidirectional slight axial loads simultaneously, featuring high rotating speed, low friction coefficient, silent operation and wide adaptability. Composed of inner and outer rings, precision steel balls, high-strength cages and multi-specification sealing structures, the bearings enable smooth and uniform operation of steel balls without jamming or eccentric wear due to standardized groove tracks. They are perfectly suitable for general mechanical equipment such as motors, water pumps, fans and reducers that operate continuously at high speed, serving as core basic transmission components for light industry, heavy industry and civil electromechanical equipment.

NMT deep groove ball bearings feature a complete product portfolio, including 6000, 6200, 6300, 6400 general series, 61900, 61800 thin-wall precision series and high-speed silent non-standard series. Multiple structures are available: open type, double-sided rubber seal 2RS, double-sided iron seal ZZ and enhanced dustproof & waterproof models. Two clearance specifications (standard clearance and C3 increased clearance) are matched for ordinary speed, high-speed operation and slight impact working conditions. A large number of standard models are in stock for quick delivery, while non-standard size and P6/P5 high-precision customization are supported to meet the needs of domestic equipment replacement, imported old equipment maintenance and automatic equipment precision assembly, realizing seamless replacement of new and old equipment.

Compared with other types of bearings, NMT deep groove ball bearings have outstanding comprehensive advantages: different from roller bearings, they have lighter weight, lower friction resistance and higher limit rotating speed without overheating and jamming during high-speed operation, suitable for continuous high-frequency operation of electromechanical equipment; different from angular contact bearings, they feature simple structure, no self-aligning or gap calibration required and ultra-high universality without complex assembly process. Compared with inferior miscellaneous bearings, they have fully upgraded steel ball accuracy, raceway finish and sealing protection, completely solving common problems such as high-speed abnormal noise, overheating, dust jamming and short-term wear failure. The bidirectional slight axial limiting capacity can offset slight axial play during equipment operation and protect motor shafts and pump main shafts from eccentric wear.

Industrial three-phase motors, civil fans, centrifugal water pumps, air compressors, conveyor rollers, small reducers, textile machinery, packaging equipment, automatic transmission mechanisms and home appliance motors operate under complex conditions of long-term continuous high-speed operation, floating dust, humid moisture and frequent start-stop all year round. Low-end inferior deep groove ball bearings generally have defects such as rough raceway grinding, low-precision steel balls, thin and deformable cages, large sealing gaps and insufficient steel hardness. After long-term high-speed operation, faults such as soaring noise, bearing overheating seizure, steel ball wear and falling off, sealing failure leading to dust and water ingress, and increased clearance vibration are prone to occur, directly causing motor overheating and burnout, water pump abnormal noise and water leakage, excessive fan vibration and production line shutdown stuttering. Frequent bearing replacement increases enterprise operation and maintenance costs and seriously affects equipment production stability.

All NMT deep groove ball bearings are made of high-purity vacuum degassed bearing steel with extremely few internal impurities and pores and uniform and dense metallographic structure, fundamentally eliminating early wear and fatigue peeling caused by loose materials. The inner and outer ring raceways adopt ultra-precision mirror grinding technology with accurate and symmetrical groove radian, matching high-precision polished steel balls to realize uniform and regular contact tracks, ultra-low operating friction resistance and stable and silent high-speed operation. The bearings undergo overall quenching and low-temperature tempering stabilization treatment with uniform surface hardness and excellent wear resistance, fatigue resistance and pitting resistance, avoiding raceway peeling and steel ball wear during long-term continuous high-speed operation.

Multiple sealing structures are designed to adapt to full-scenario working conditions: open type without seal is suitable for clean, high-speed and oil bath lubrication conditions with excellent heat dissipation for precision high-speed motors and high-speed automatic equipment; ZZ double-sided iron seal adopts metal seal to prevent dust and debris with firm and non-deformable structure, suitable for dry and dusty workshops, textile, packaging and conveying equipment; 2RS double-sided rubber seal features tightly fitted rubber oil seal with excellent waterproof, oil-proof and water permeation resistance. It is suitable for water pumps, outdoor fans and humid working conditions, which can lock internal grease for long-term maintenance-free operation.

Two configurations of high-strength cold-rolled steel stamping cage and engineering nylon cage are adopted: the steel plate cage has strong rigidity, deformation resistance and high temperature resistance for high-speed and high-temperature continuous operation; the nylon cage has good self-lubricating performance and lower friction noise for silent precision electromechanical equipment with no abnormal noise or resonance during operation. All bearings are strictly divided into standard clearance and C3 increased clearance. C3 clearance is standard for high-speed equipment to reserve thermal expansion margin and eliminate bearing jamming caused by high-speed temperature rise.

Every NMT deep groove ball bearing undergoes strict factory inspections, including raceway contour accuracy detection, steel ball roundness sorting, noise and vibration test, high-speed temperature rise simulation, sealed waterproof and dustproof test and precise clearance grouping to eliminate defective products with insufficient accuracy, excessive noise and unstable performance. The operating temperature ranges from -20℃ to 120℃, compatible with grease and thin oil lubrication, adapting to conventional complex environments such as industrial dryness, humidity and dust.

Electromechanical equipment equipped with NMT deep groove ball bearings operates with lower noise, smaller temperature rise and more stable vibration, completely improving motor abnormal noise, fan jitter and water pump stuttering. The bearings are wear-resistant and fatigue-resistant with a service life 2-4 times longer than ordinary low-end bearings, greatly reducing equipment failure shutdown frequency, bearing replacement times and manual maintenance costs, ensuring 24-hour continuous and stable operation of assembly lines and electromechanical equipment.

Current general electromechanical equipment is iterating towards silence, high speed, maintenance-free and long service life. Inferior bearings have poor accuracy, high noise, easy wear and poor sealing, failing to meet the needs of modern industrial continuous production. Relying on four core technologies including ultra-precision raceway processing, high-precision steel ball selection, high-strength sealing protection and stable heat treatment process, NMT solves industrial pain points such as high-speed abnormal noise, high-temperature seizure, dust and water ingress, fatigue wear and equipment jitter, providing high-precision, low-noise and long-life standardized bearing solutions for general industrial electromechanical equipment.

Core Product Advantages

1. Precision deep groove arc raceway design ensures regular steel ball operation track, ultra-low friction resistance, silent high-speed operation without abnormal noise and resonance jitter.

2. High-purity bearing steel and ultra-precision grinding technology endow the raceway with excellent wear resistance and pitting resistance, avoiding fatigue peeling and failure during long-term high-speed operation.

3. Multiple optional sealing structures (open, iron seal, rubber seal) fully cover dustproof, waterproof and oil-proof functions, adapting to dry, wet and dusty working conditions.

4. Dual clearance specifications: standard clearance for conventional equipment and C3 increased clearance for high-speed equipment to eliminate high-temperature seizure.

5. Bidirectional composite load capacity bears radial force and slight bidirectional axial force with accurate limiting to avoid spindle eccentric wear.

6. Dual cage options: steel plate type for high temperature and deformation resistance, nylon type for silent and low friction, realizing flexible scenario adaptation.

7. Full-series standard stock + P5/P6 precision customization + non-standard modification with strong universal replacement and seamless adaptation for new and old equipment.

8. Full factory inspections of noise, temperature rise and sealing ensure high performance consistency and greatly reduce equipment operation and maintenance failure rate.

Typical Application Scenarios

Motor equipment: industrial three-phase asynchronous motor, servo motor, stepping motor, variable frequency motor, small reduction motor;

Fluid equipment: centrifugal water pump, oil pump, sewage pump, booster pump, ventilator, blower, axial fan;

General machinery: air compressor, conveyor roller, textile machinery, packaging equipment, small gear reducer;

Automation equipment: assembly line transmission mechanism, precision small transmission module, automatic conveying roller;

Civil electromechanics: home appliance motor, cooling fan, small transmission equipment, light-duty general mechanical equipment.

Quality Assurance

NMT deep groove ball bearings adopt vacuum refined high-purity bearing steel, which is precisely turned after forging. The raceways undergo multiple ultra-precision mirror grinding with minimal arc accuracy error. High-precision polished steel balls with uniform roundness are selected. Constant temperature quenching heat treatment ensures uniform and stable hardness, balancing surface wear resistance and overall fatigue resistance. After assembly, the bearings undergo high-speed running noise reduction treatment to release assembly stress in advance, with full-dimensional inspections of noise, temperature rise, sealing and clearance before delivery. Adaptable to complex working conditions such as continuous high-speed operation, dusty humidity and frequent start-stop, the products feature stable operation, silent wear resistance and long maintenance-free cycle, effectively reducing equipment failure rate and comprehensive enterprise operation and maintenance costs.

Product Range

General series: 6000, 6200, 6300, 6400 standard deep groove ball bearings;

Thin-wall precision series: 61800, 61900 ultra-thin light-duty precision bearings;

Sealing types: open type, ZZ double-sided iron seal, 2RS double-sided rubber seal;

Precision grades: ordinary grade, P6 precision grade, P5 high-precision grade;

Clearance specifications: standard ordinary clearance, C3 increased high-speed clearance;

Applicable working conditions: continuous high-speed operation, silent precision transmission, dusty, humid and watery environment, frequent start-stop equipment.

Brand Strength

NMT Japan has years of experience in R&D and manufacturing of general precision bearings, focusing on the optimization and upgrading of deep groove ball bearings specially for industrial motors, water pumps, fans and other general electromechanical equipment. Continuous process iteration is carried out to solve industrial pain points such as high noise, easy overheating, dust ingress, short service life and high-speed jitter of mainstream bearings. Relying on four core technologies including ultra-precision raceway processing, high-precision steel ball matching, multi-channel sealing protection and stable heat treatment, NMT develops high-quality deep groove ball bearings with silence, high speed, wear resistance and maintenance-free performance. Bulk supply is provided for electromechanical equipment manufacturers, automatic equipment manufacturers, maintenance supporting enterprises and parts distributors to stabilize equipment operation, reduce equipment noise and vibration, cut sudden shutdown failures and comprehensively reduce enterprise production and operation costs.