Deep groove ball bearings are the most widely used general rolling bearings, featuring an integrated annular deep raceway structure with excellent fitting between steel balls and raceways. They can bear radial load and bidirectional axial load simultaneously, adapting to both stable high-speed rotation and composite stress of slight eccentricity and axial play. Products are categorized into four sealing types: open type, single-sided rubber seal 2Z, double-sided rubber seal 2RS1 and double-sided metal shield Z. Cages include stamped steel cages, nylon plastic cages and solid brass cages. Characterized by compact structure, easy disassembly and low maintenance cost, they are widely applied to industrial motors, clean water pumps, cooling fans, small gearboxes, household electromechanical equipment and assembly line rollers. Core advantages include high-speed low-noise performance, strong versatility, composite load adaptability and optional dustproof & waterproof sealing.

Main model classification: 6000 ultra-thin light series, 6200 standard general main series, 6300 thickened heavy-duty series; Sealing types: open type, ZZ metal shield, 2RS contact rubber seal; Precision grades: P0 civil general grade, P6 motor silent grade, P5 precision high-speed grade; Clearance groups: C0 standard clearance, C3 increased clearance (special for high-temperature variable frequency motors).

Performance comparison: Compared with cylindrical roller bearings, it can bear bidirectional axial force with low requirement for shaft alignment to simplify overall structural layout, yet its heavy radial load capacity is much weaker. Compared with angular contact ball bearings, single bearing can realize radial & axial limit without paired installation for higher cost performance but lower ultimate axial load capacity. Compared with spherical roller bearings, it has small volume, higher speed limit and low friction loss without large-angle self-aligning capability, so it is not suitable for working conditions with severe shaft deformation. Shortcoming: Steel ball indentation and plastic deformation of raceways are prone to occur under heavy overload; rubber seals may harden and leak oil after long-term high-temperature operation.

Industrial variable frequency motors, circulating water pumps, dust removal fans and assembly line conveyor rollers operate under long-term frequent start-stop, high-speed rotation, water vapor & dust intrusion and fluctuating temperature rise of frequency conversion. Inferior deep groove ball bearings have roughly turned raceways without superfinishing, causing harsh howling noise at high speed. Inconsistent roundness of steel balls leads to intense vibration and cabinet resonance of motors. Poor-quality sealing rubber cracks rapidly under high temperature, and intrusion of water vapor & dust results in raceway rust and pitting. Imbalanced internal grease filling causes dry grinding due to insufficient grease or excessive heat from grease agitation. These faults directly lead to excessive noise & vibration of motors, water pump water leakage & abnormal noise, fan shaking imbalance and conveyor roller seizure shutdown, sharply increasing failure rate of electromechanical equipment and raising maintenance frequency & accessory loss.

NMT deep groove ball bearings cover full size range of 6000/6200/6300 series with sufficient stock for P6 silent motor bearings, C3 high-temperature variable frequency motor bearings and 2RS waterproof & dustproof sealed bearings. Manufactured from vacuum degassed bearing steel, inner and outer ring raceways are processed by super-finish grinding to achieve accurate arc contour matching steel ball spherical surface for smooth rotation and low resistance. High-grade precision steel balls are selected by grading with tiny dimensional errors to guarantee low-vibration high-speed operation. Stamped steel cages serve cost-effective industrial supporting, nylon cages focus on low noise & friction, and brass cages are applied for high-temperature drying equipment. 2RS contact rubber seals adopt temperature-resistant nitrile rubber to block water vapor and dust, while ZZ metal shields fit dry dust-free high-speed working conditions. Long-acting composite grease is pre-filled before delivery to adapt to continuous operation in wide temperature range. All dimensions conform to national general specifications for direct replacement of old bearings on motors, water pumps and fans without modification of housing and shaft diameter.

General power motors, fluid pumps, ventilation equipment and light industrial conveying machinery are upgraded toward low-noise operation, long maintenance-free cycle, stable operation in wide temperature range and universal interchangeable assembly. Low-grade deep groove ball bearings with rough raceway machining, uneven steel ball precision and poor weather resistance of seals suffer from abnormal noise, oil leakage and rust seizure after short service life, and frequent shutdown maintenance disrupts normal operation of production lines and equipment. The market urgently needs high-durability general deep groove ball bearings with mirror-finished raceways, assembled precision steel balls and aging-resistant seals.

NMT realizes high-speed low-noise operation, stable composite load bearing and long-term sealing protection via three core processes: mirror super-finishing of raceways, graded matching of precision steel balls and customized sealing & lubrication for working conditions. Finished bearings pass noise detection, high-speed temperature rise test, waterproof & dustproof spray test and clearance grading screening to eliminate defective products with raceway defects, steel ball flaws and poor sealing. It ensures long-term stable operation of various general electromechanical equipment and cuts comprehensive costs including abnormal noise failure, oil leakage maintenance and accessory replacement.

Core Product Advantages

Integrated deep raceway structure bears combined radial and bidirectional axial load; single bearing withstands axial play load to save installation cost of paired bearings.

Mirror super-finished raceways ensure smooth fitting of steel balls and low noise during high-speed rotation, meeting silent operation requirements of motors and fans.

Multiple sealing options: ZZ metal shield for dust prevention, 2RS rubber seal for waterproof & dustproof, adapting to different environments such as humid water pumps and dusty fans.

Three cage options: stamped steel for high cost performance, nylon for low noise & heat generation, brass for high-temperature resistance.

C3 increased-clearance models reserve thermal expansion space for temperature rise of variable frequency motors to avoid shaft seizure under high temperature.

Standardized universal outer diameter, inner diameter and thickness enable direct interchange with mainstream electromechanical bearings on the market for convenient stock preparation and maintenance replacement.

Pre-filled long-acting grease before delivery allows long maintenance-free grease filling for sealed bearings.

Compact lightweight structure reduces design space for equipment housing and facilitates miniaturization of complete machines.

Typical Application Scenarios

Front and rear support bearings for Y/Y2/YE2 three-phase asynchronous motors and variable frequency motors; Main shaft bearings for clean water centrifugal pumps, self-priming pumps and pipeline pumps; Motor bearings for cooling tower fans, centrifugal fans and axial flow fans; Input and output bearings for small gear reducers and worm gear reducers; Bearings for assembly line conveyor rollers and belt idlers; Auxiliary bearings for air compressor heads; Household motor bearings for outdoor air conditioners, range hoods and fan coil units; Electromechanical bearings for garden water pumps and agricultural irrigation equipment.

Quality Assurance

NMT deep groove ball bearings adopt integral quenching bearing steel with uniform hard and wear-resistant raceways, high dimensional consistency of steel balls and excellent vibration & noise level. Compatible with lithium grease and high-temperature composite grease lubrication, operating temperature ranges from -40℃ to 120℃, adapting to diverse working conditions including open-air humid water pumps, dusty workshop fans, indoor high-speed motors and high-low temperature variable frequency power equipment.

Product Range

6000 ultra-thin light series, 6200 standard general series, 6300 thickened heavy-duty series; Sealing styles: open type, ZZ double-sided metal dust cover, 2RS double-sided rubber oil seal; Precision grades: P0, P6, P5; Clearance: C0 standard clearance, C3 high-temperature increased clearance; Cages: stamped steel, nylon, solid brass.

Brand Strength

NMT Japan solves three major pain points of ordinary deep groove ball bearings: harsh high-speed noise, rust seizure caused by water & dust intrusion due to aging seals and seizure failure from high-temperature temperature rise. Core technologies including super-finishing of raceways, precision steel ball selection and weather-resistant sealing structural design develop silent and durable general-purpose deep groove ball bearings for electromechanical equipment. We supply bearings for motor manufacturers, water pump producers, fan manufacturers, automated assembly line equipment factories and household appliance supporting enterprises to reduce equipment operating noise, extend bearing service life and cut daily operation & maintenance costs of equipment.