Deep groove ball bearings are the most widely used type of rolling bearings, mainly composed of inner rings, outer rings, steel balls and cages with continuous arc deep groove raceway structure. They primarily bear radial loads and can support a certain amount of bidirectional axial loads, enabling stable high-speed operation. Featuring simple structure, excellent versatility and convenient installation and maintenance, the products are applied to various small and medium-sized industrial motors, water pumps, oil pumps, centrifugal fans, air compressors, textile machinery, conveying equipment, household appliances, general reducers and many conventional mechanical devices.

Compared with cylindrical roller bearings, deep groove ball bearings adopt steel balls as rolling elements with point contact, achieving higher limiting rotating speed yet relatively weaker radial load capacity. Different from angular contact ball bearings, deep groove ball bearings have no preset contact angle after production. They are not suitable for heavy axial thrust and can operate independently without paired assembly, fitting most working conditions without heavy axial loads. All kinds of general electromechanical equipment run continuously for a long time, putting basic but strict requirements on bearing operating noise, rotary stability and long-term sealing performance. Ordinary deep groove ball bearings on the market usually suffer from large dimensional dispersion of steel balls, insufficient raceway grinding precision and simple design of dustproof sealing structure. Abnormal noise, grease loss and premature corrosion wear easily occur during long-time high-speed operation, shortening maintenance cycles of complete machines.

NMT Deep Groove Ball Bearings feature a complete product line, including open type, single metal shield, double metal shield and double rubber sealed structures. Normal clearance and C3 clearance are regularly available. Stamped steel cages are equipped. Specifications cover miniature, small and medium-small standard sizes, fully meeting supporting demands of general industrial equipment, household appliances and fluid machinery.

With continuous development of general machinery industry, motors, pumps and fans are upgraded toward miniaturization, lightweight, low noise and long maintenance-free cycles. Higher standards are raised for bearing high-speed stability, low-noise performance as well as dust-proof and moisture-proof capacity to reduce equipment downtime and maintenance frequency. Conventional deep groove ball bearings lack sufficient precision in curved raceway machining. Uneven stress occurs during steel ball operation, and poor fitting performance of sealing lips allows dust and moisture to invade inside bearings, causing deterioration of lubricating grease and eventually triggering corrosion and fatigue wear. They cannot adapt to continuous production environments with humidity and heavy dust. Equipment manufacturers are in urgent need of high-quality deep groove ball bearing solutions integrating low noise, long-term sealing and stable durability.

NMT Deep Groove Ball Bearings adopt optimized curve profiles for inner and outer raceways to improve contact status between steel balls and raceways and effectively reduce operating vibration and noise. A complete steel ball grading system strictly controls roundness and dimensional tolerances of steel balls. Ultra-precision continuous grinding technology is applied on inner and outer raceways to enhance surface finish. Heat treatment processes are continuously optimized to balance hardness and toughness of steel and improve anti-fatigue performance. Sealing structures are improved to strengthen resistance against dust and moisture intrusion and slow down aging of lubricating grease, delivering stable and reliable supporting guarantee for various general rotating equipment.

NMT Deep Groove Ball Bearings consist of inner rings, outer rings, precision steel balls and stamped steel cages. Open types support on-site grease replenishment; metal dust shields fit clean and dry working conditions; rubber sealing structures possess outstanding dust and moisture resistance for maintenance-free operation scenarios. Normal clearance applies to equipment operating stably at normal temperature; enlarged C3 clearance adapts to high-speed motors, pumps and fans with continuous temperature rise. The deep groove structure can bear radial loads and appropriate bidirectional axial loads simultaneously, featuring low rotary resistance and superior high-speed performance. All steel balls undergo precise dimensional sorting before assembly to guarantee uniform load distribution and avoid raceway damage caused by local stress concentration. The products are extensively matched with industrial asynchronous motors, water pumps, vacuum pumps, centrifugal fans, textile equipment, conveyor rollers, small reducers and transmission parts of household and commercial electrical appliances.

High-purity bearing steel is selected for inner and outer rings. Forging refines internal grain structure. Accurate constant-temperature quenching and tempering balance surface wear resistance of raceways and matrix toughness to resist fatigue pitting caused by long-term alternating loads. Multi-layer ultra-precision grinding is implemented on arc raceways of inner and outer rings to optimize surface micro-morphology, facilitate stable formation of lubricating oil film and continuously lower friction noise during high-speed operation. All finished products pass geometric dimension inspection, steel ball grouping verification, radial clearance sorting, high-speed low-noise endurance test and sampling fatigue life verification. Defective workpieces are eliminated to guarantee consistent performance of mass-produced bearings.

Multiple sealing forms and clearance specifications are optional. International standard outer dimensions ensure excellent interchangeability for convenient assembly, commissioning and maintenance replacement of general mechanical equipment.

Core Product Advantages

Classic deep groove ball structure bears radial loads and appropriate bidirectional axial loads, covering a wide range of application scenarios.

Multiple sealing options including open type, metal shield and rubber seal adapt to periodic oil filling and long-term maintenance-free working conditions respectively.

Excellent limiting speed and low rotary friction resistance with remarkable low-noise performance, satisfying low-noise demands of fans and motors.

Integrated stamped steel cage features compact structure and light self-weight, meeting lightweight assembly requirements of small and medium-sized equipment.

Optional normal clearance and enlarged C3 clearance adapt to normal-temperature equipment and high-speed working conditions with temperature rise.

Precisely graded steel balls achieve high dimensional consistency, effectively suppressing vibration under high-speed rotation and delaying fatigue damage.

Ultra-precision mirror grinding on inner and outer raceways delivers high curved surface precision, smooth rotation and stable low-noise effect during long-term operation.

Standardized outer dimensions with outstanding universality, widely applied to motors, water pumps, fans, textile machinery and conveying equipment.

Typical Application Scenarios

Various three-phase asynchronous motors and variable frequency motors; water pumps, oil pumps, circulating pumps and vacuum pumps; centrifugal fans, cooling fans and blowers; textile machinery, conveyor rollers and light-duty conveyors; small gear reducers and packaging machinery; air compressors and refrigeration compressors; household and commercial electrical appliances such as washing machines and ventilation fans.

Quality Assurance

Raw materials of NMT Deep Groove Ball Bearings receive sampling inspection for hardness, metallographic structure and non-metallic inclusions 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 ultra-precision raceway grinding. All steel balls are graded and grouped according to high-precision standards to guarantee uniform stress distribution during operation. After assembly, structures with different seals pass dust-proof and moisture-proof endurance tests. All finished goods pass visual inspection, clearance screening, high-speed low-noise endurance test and temperature rise detection. Non-conforming products are separated independently. Every deep groove ball bearing features smooth rotation, low operating noise and reliable sealing, supporting long-term stable operation of all kinds of general electromechanical equipment.

Product Range

Open type, ZZ metal shield, 2RS rubber sealed deep groove ball bearings; normal clearance, C3 clearance; stamped steel cages; specifications cover miniature, small and medium-small standard bearings. Select corresponding sealing and clearance types according to rotating speed, environmental dust and humidity as well as maintenance plans.

Brand Strength

NMT devotes itself to R&D and manufacturing of general precision bearings. Targeting characteristics of motors, pumps and fans including continuous high-speed operation, strict noise control and diverse complex working environments, NMT continuously optimizes raceway curve design, steel ball screening standards, grinding technology and sealing schemes. It solves common industry problems such as abnormal operating noise, seal failure and premature corrosion wear of bearings. NMT helps general machinery manufacturers improve overall equipment operation quality, extend maintenance cycles and reduce operation and maintenance costs.