Deep groove ball bearings are the most widely used basic rolling bearings in industry. Adopting single-row steel balls and arc deep groove raceway structure, they can bear radial loads as well as bidirectional light axial loads. Featured by high limiting speed, low rotational friction coefficient, low operating noise and simple structure for easy installation and maintenance, they are divided into three major structures: open non-sealed type, single-side sealing (2Z/2RZ) and double-side sealing (2RS/2RS1). Sealed types effectively block dust, water vapor and oil contamination from entering the bearing cavity, suitable for most conventional rotating working conditions such as electric motors, pumps, fans, air compressors and conveying equipment, serving as essential general bearings for complete machine assembly and equipment maintenance.

Main model classification: 6000 thin series, 6200 standard medium series, 6300 thickened heavy-duty series, plus 6400 extra heavy-duty series and 16000 thin-wall series. Sealing structures: open type (no seal), iron shield dustproof (ZZ), rubber oil seal waterproof and dustproof (2RS). Clearance includes C0 standard clearance and C3 large clearance for high-speed high-temperature motors. Precision grades cover ordinary grade, P6 precision grade and P5 high-precision grade for precision motor applications.

Performance comparison: Compared with cylindrical roller bearings, it has outstanding high-speed performance and mute operation but weaker radial load capacity. Different from angular contact ball bearings, paired installation is unnecessary, and bidirectional axial limiting can be realized with lower structural cost. Compared with spherical roller bearings, it features compact size and extremely high upper speed limit, not applicable for eccentric heavy-load vibration conditions. Shortcoming: steel balls are prone to indentation and pitting under heavy impact load; seals tend to age and fail under long-term operation in harsh dusty and muddy environments.

Three-phase asynchronous motors, clean water pumps, sewage pumps, cooling fans, screw air compressors, belt conveyors, reducer input shafts, agricultural machinery and garden machinery run continuously at high speed all year round, accompanied by temperature rise, water splashing, dust drifting and alternating belt tension load. Inferior deep groove ball bearings contain excessive steel impurities, leading to rapid heat generation and seizure during high-speed rotation. Rough grinding texture on raceways causes sharp howling noise at high rotating speed. Poor-quality rubber sealing rings crack and allow water and dust intrusion after high-temperature grease aging, resulting in steel ball rust pitting and cage deformation & disintegration, directly causing motor stator rubbing burnout, abnormal pump noise & water leakage, fan unbalanced vibration and air compressor overload shutdown. Small bearing faults in civil and industrial equipment may easily lead to complete machine scrapping.

NMT deep groove ball bearings cover full specifications of 6000, 6200, 6300, 6400 and 16000 series with complete open, iron shield and rubber oil seal options. Standard clearance, C3 high-temperature large clearance and P6/P5 precision grades are available on demand. Manufactured from high-purity vacuum degassed bearing steel with super mirror finishing on raceways. High-precision graded steel balls ensure uniform circumferential clearance and excellent temperature rise control during high-speed rotation. Thickened nitrile rubber oil seals resist high temperature and hydrolysis; double-sided sealing effectively blocks water vapor and dust, while iron shield versions suit dry and dust-free indoor conditions. Riveted stamped steel cages stay tight without loosening or fracture under high centrifugal force. Long-life high-temperature grease is pre-filled before delivery for long-term continuous motor operation. All dimensions comply with national standards for direct interchangeable installation during motor maintenance, pump renovation and assembly line maintenance, compatible with replacement of various domestic and imported deep groove ball bearings.

General power machinery, small transmission equipment and civil electromechanical equipment are upgraded toward mute operation, long maintenance-free service life, high-speed stability and low failure rate. Ordinary low-grade deep groove ball bearings suffer from rough raceway machining, poor steel ball precision and insufficient high-temperature resistance of seals, resulting in harsh high-speed noise, excessive temperature rise and premature seal aging & water corrosion. They cannot meet the operation requirements of 24-hour continuous operation of industrial motors, water pump humid environments and constant-temperature high-speed operation of fans. The market urgently needs standardized deep groove ball bearings with high precision, low noise, durable seals and stable high-speed performance.

NMT adopts super-finishing on deep groove raceways to reduce rolling friction and achieve remarkable mute effect. High-purity bearing steel suppresses fatigue spalling for extended service life. Reinforced sealing structures support selective use for different working conditions: iron shields for cost control in dry environments and double-layer rubber oil seals for dust & moisture protection in dusty & humid scenarios. All finished bearings pass noise inspection, temperature rise test and sealing tightness sampling inspection to eliminate defective products with abnormal noise, dimensional deviation and seal defects, ensuring smooth and low-noise operation of power spindles and avoiding shaft burning caused by bearing overheating.

Core Product Advantages

Classic deep groove ball structure adapts to radial load and bidirectional light axial load for most general rotating scenarios.

Ultra-high limiting rotating speed with low friction loss to reduce temperature rise for high-speed operation of motors and fans.

Three sealing structures for optional selection: open type for regular greasing maintenance, iron shield for dust prevention, rubber oil seal for waterproof & dustproof performance.

Optional P5/P6 precision grades to control vibration and noise for precision motors and high-speed equipment.

C3 large-clearance models compensate thermal expansion for high-temperature motors to eliminate high-temperature seizure.

High-precision graded steel balls and mirror-finished raceways deliver smooth rotation without howling noise for superior mute performance.

Pre-filled high-temperature long-life grease extends initial maintenance-free service cycle.

Standard national overall dimensions achieve full compatibility for direct replacement during maintenance of new and old equipment without modification.

Typical Application Scenarios

Spindle bearings for Y/Y2/Y3 series three-phase motors and servo auxiliary motors; bearings for centrifugal clean water pumps, self-priming pumps, sewage pumps and circulating water pumps; support bearings for centrifugal fans, axial fans, boiler induced draft fans and cooling fans; head bearings for screw air compressors and piston air compressors; high-speed shaft bearings for belt conveyors, rollers and small reducers; bearings for agricultural & garden machinery such as lawn mowers and tractors; bearings for household air conditioner fans, washing machine drums, small air compressors and power tools.

Quality Assurance

NMT deep groove ball bearings are made of vacuum refined bearing steel to reduce internal inclusions and inhibit high-speed fatigue pitting. Super-finished inner and outer ring raceways feature high surface finish to lower friction heat generation. Seals adopt aging-resistant nitrile rubber for wide operating temperature range of -30℃~120℃. Compact and stable stamped steel cages support both lithium grease lubrication and high-speed thin oil lubrication, suitable for diverse conventional working conditions including indoor dry, outdoor humid and light dust environments.

Product Range

6000 thin-wall light series, 6200 standard main series, 6300 thickened heavy-duty series, 6400 heavy deep groove ball series, 16000 ultra-thin wall series; sealing types: OPEN open type, double iron shield ZZ, double rubber oil seal 2RS; clearance: C0 standard clearance, C3 high-temperature large clearance; precision grades: ordinary grade, P6 grade, P5 precision grade.

Brand Strength

NMT Japan solves three common defects of ordinary deep groove ball bearings: loud high-speed abnormal noise, seal aging & water corrosion under high temperature and excessive temperature rise leading to seizure at high speed. Three core technologies including mirror super-finishing of raceways, high-precision steel ball selection and working-condition-oriented sealing selection realize comprehensive performance of high-speed mute operation, durable sealing and stable temperature rise. We supply bearings for motor manufacturers, water pump producers, fan equipment factories, electromechanical repair shops and automation assembly line supporting enterprises to stabilize operating noise and temperature of power equipment, reduce shutdown failures caused by bearing burnout and cut accessory replacement frequency and maintenance costs for general machinery and equipment.