Deep groove ball bearings are the most widely used standard rolling bearings in the industry. Featuring an integral arc deep groove raceway structure, they bear stable radial loads as well as slight bidirectional axial loads, suitable for high-speed stable rotation with easy assembly and supreme versatility without complex pairing or preloading. Classified into open type, metal dust shield (Z/ZZ) and rubber contact seal (RS/2RS). Sealed versions store grease for long-term maintenance-free operation, widely applied to three-phase asynchronous motors, clean water pumps, circulating fans, belt conveyor rollers, reducers, auxiliary air compressor units, automotive accessories, washing machines, air conditioner fans, food conveying equipment and other general rotating components.

Main model classification: 6000 ultra-thin light series, 6200 standard general main series, 6300 thickened heavy-duty series; extra heavy-duty 6400 series, snap ring N series, tapered bore K series. Sealing types: OPEN open type, single-side metal shield Z, double-side metal shield ZZ, single-side rubber seal RS, double-side rubber seal 2RS. Clearance: C0 normal clearance, C3 increased clearance for high-temperature motors.

Compared with angular contact ball bearings, they require no paired assembly with lower cost and simpler installation for conventional transmission without strong axial thrust. Against spherical roller bearings, they deliver higher speed limit and compact structure. The main weakness is limited axial load capacity, unable to withstand heavy axial impact, prone to unilateral wear under heavy eccentric load.

Industrial fans, assembly-line conveyors, civil water pumps and household appliance motors run continuously under heavy dust, humid moisture and drastic temperature fluctuation. Inferior deep groove ball bearings have rough raceway grinding and low-precision steel balls, causing excessive vibration and harsh noise at high speed. Residual machining iron filings from poor internal cleanliness degrade grease rapidly leading to dry friction and overheating. Aging and hardening of sealing rubber rings allow dust and moisture intrusion, triggering rust and pitting on steel balls and raceways. Consequences include abnormal noise & overheating trip of motors, jamming & deviation of conveyor rollers, pump seizure from water leakage, frequent replacement of bulk equipment parts and soaring operation & maintenance costs.

NMT deep groove ball bearings cover full regular and non-standard dimensions of 60, 62, 63, 64 series with stocked C0 normal clearance and C3 high-temperature clearance. Forged blanks of high-purity bearing steel are adopted; superfinishing on raceways delivers smooth arc contour for tight fit with steel balls, low rotation resistance and heat generation. High-grade precision steel balls ensure smooth rotation and outstanding noise control. Double-sided rubber seals use aging-resistant nitrile rubber to fit bearing end faces for grease retention, dustproofing and waterproofing. Thickened stamped steel plates for double-side metal shields adapt to dry dusty conditions. Long-life lithium-based grease is pre-filled before delivery for direct installation. All dimensions comply with national standards for direct replacement of all domestic standard deep groove ball bearings for new machine assembly, equipment overhaul and household appliance after-sales maintenance.

General electromechanical equipment, assembly-line conveyors and white goods are upgraded toward low-cost stable operation, minimal maintenance and extended service life. Low-end conventional deep groove ball bearings suffer poor raceway precision, easy seal aging and insufficient grease storage, resulting in amplified noise, thermal seizure and water ingress corrosion after short service life. They fail to satisfy basic demands such as 24-hour continuous operation of industrial motors, outdoor water pump operation under rain and year-round non-stop conveying of production lines. The market demands cost-effective deep groove ball bearings with low noise, robust sealing and long durability.

Integrated precision grinding on NMT deep groove raceways evenly distributes force to avoid wear from concentrated stress. Optimized sealing lip structure narrows fitting clearance to upgrade waterproof & dustproof performance for outdoor water pumps and open-air conveyors. Enlarged internal lubrication cavity boosts grease storage to extend grease service life. Stabilization heat treatment of steel prevents deformation and clearance abnormality under high temperature. Finished bearings undergo silent sorting with high/low-speed noise grading before delivery for quiet operation after motor assembly.

All finished bearings pass raceway contour inspection, noise & vibration grading, water & dust spray test and high-temperature endurance aging test to eliminate defective items with excessive noise, seal leakage and heat treatment defects, guaranteeing stable, low-noise and long-term operation of general rotating parts.

Core Product Advantages

Integrated deep arc raceway mainly bears radial loads with tolerance for minor bidirectional axial force; no pairing or commissioning required for easy installation.

Three core series cover light-load, standard and heavy-load scenarios; C3 increased clearance models fit high-temperature motors and fans.

Multiple sealing options: metal shields for dry dusty environments, rubber seals for waterproof & dustproof maintenance-free use, open type for convenient on-site grease refilling.

Superfinished raceways + precision steel balls enable smooth rotation and low overall noise, meeting mute requirements of fans and household appliances.

Optimized sealing lip structure blocks moisture and dust penetration for greatly enhanced durability of outdoor water pumps and open conveyors.

Expanded internal grease storage cavity with factory pre-filled grease enables long maintenance-free operation after installation.

Stabilization heat treatment ensures stable dimensional performance under high & low temperature to prevent thermal seizure and abnormal clearance.

Universal standard outer dimensions support direct interchange for bearings of new and old equipment.

Typical Application Scenarios

Spindle bearings for industrial three-phase motors, fan motors and cooling tower fans; bearings for clean water centrifugal pumps, pipeline circulating pumps and booster pumps; roller bearings for belt conveyors, roller conveyors and assembly-line idlers; bearings for small gear reducers, blowers and auxiliary air compressor motors; accessory bearings for automobile generators, tension pulleys and air conditioning compressors; household bearings for washing machines, indoor & outdoor air conditioner fans, range hoods and blenders; general bearings for food machinery, textile machines and small transmission rollers.

Quality Assurance

NMT deep groove ball bearings adopt vacuum-melted bearing steel with low impurity content for prolonged contact fatigue life. Superfinishing on inner & outer ring raceways reduces rolling friction loss. One-piece stamping of cold-steel cages delivers high toughness and fracture resistance. Seals are categorized into nitrile rubber for general use and fluororubber for oil resistance to adapt to oil & water working conditions. Strict clearance grouping marking allows direct selection of C3 clearance models for high-temperature motors. Fully applicable to continuous regular rotation, slight axial force, dusty humid environment and alternating high-low temperature conditions.

Product Range

6000 light-duty series, 6200 standard main series, 6300 heavy-duty series, 6400 extra heavy-duty series; variants with snap ring N, tapered bore K; sealing types: OPEN open type, Z/ZZ metal dust shield, RS/2RS rubber seal; clearance grades C0, C3.

Brand Strength

NMT Japan resolves three typical drawbacks of ordinary deep groove ball bearings: loud noise & vibration from rough raceways, rapid damage from water & dust ingress via aging seals and early high-temperature seizure due to insufficient grease supply. Process upgrades including raceway superfinishing, optimized composite sealing and adequate pre-lubrication realize silent rotation, durable sealing and long maintenance-free service. We supply cost-effective general bearings for motor manufacturers, pump factories, conveying equipment makers, electromechanical parts distributors and household appliance maintenance service providers to reduce abnormal noise faults, frequent bearing replacement and motor overheating failures, cutting daily consumable costs for equipment operation and maintenance.