Deep groove ball bearings feature circular arc deep raceways, with steel balls making four-point arc contact with raceways. It can bear radial load and slight bidirectional axial load simultaneously. Boasting simple & compact structure, wide applicable speed range, low operating noise and easy lubrication maintenance, it is the most versatile standard bearing category across all industries. Main sealing types include open non-sealed type, Z metal dust cover and 2RS rubber contact seal. Snap ring groove versions are available for easy axial positioning installation. Stamped steel cages serve as the basic configuration, while high-end silent models adopt nylon resin cages for low-noise precision working conditions. Widely applied to industrial three-phase asynchronous motors, centrifugal water pumps, centrifugal induced draft fans, cooling tower fans, air compressor end covers, auxiliary shafts of reducers, agricultural machinery, textile equipment and household appliance motors. Core strengths are extreme versatility, smooth low-noise high-speed operation, simple assembly, high inventory compatibility and low comprehensive operating cost.

Main model classification: 6000 ultra-thin light-load series, 6200 medium general main series, 6300 thickened heavy-load series; Precision grades: P0 general civil & industrial grade, P6 silent precision grade for motors; Clearance groups: C0 standard clearance (standard for motors), C3 enlarged clearance for high-temperature water pumps and high-speed fans.

Performance comparison: Compared with cylindrical roller bearings, it has compact lightweight structure and outstanding silencing performance with axial load capacity, yet greatly weakened radial rigidity unsuitable for heavy impact load. Compared with tapered roller bearings, it achieves higher limiting speed and lower operation vibration without capacity for large axial thrust. Compared with spherical roller bearings, it features lower cost, smaller size and excellent high-speed performance without eccentric self-aligning capacity, requiring basic assembly coaxiality. Shortcoming: Steel balls are prone to fatigue pitting under heavy impact load, unfit for heavy-duty impact equipment such as rolling mills and crushers.

Industrial motors, water pumps and fans run continuously at high speed for a long time, confronted with pain points including motor temperature rise, water vapor intrusion into pumps, dust accumulation on fans and alternating load during start-stop cycles. Inferior deep groove ball bearings have roughly polished raceways and steel balls with poor roundness, producing harsh abnormal noise at high speed. Rapid aging of sealing rubber rings allows water vapor and dust to dilute grease, leading to bearing seizure after grease drying up. Poor riveting of stamped cages causes cage disintegration under high centrifugal force at high speed, resulting in steel ball shedding and shaft seizure, directly triggering motor bore burn-out, pump shaft seal damage and unbalance fracture of fan blades, bringing frequent shutdown maintenance for equipment.

NMT deep groove ball bearings cover full-size series of 6000, 6200 and 6300, with sufficient stock for P6 silent motor bearings, 2RS waterproof sealed bearings for water pumps and C3 large-clearance bearings for high-temperature fans. Manufactured with high-purity bearing steel, raceways are ultra-precision arc grinding with curvature fitting steel ball contours for even load distribution and reduced high-speed friction noise. High-grade chrome steel balls are mirror polished with strictly controlled roundness tolerance to suppress high-speed vibration. Customized sealing selection: Z-type steel dust cover for dry dust-free fans, 2RS double-lip rubber seal to resist water vapor of pumps and workshop dust. Nylon cage models reduce friction resonance of steel balls for low-noise motor operation. Standard national standard overall dimensions support direct replacement for bearing housings of most motors, water pumps and fans on the market without modification.

General rotary electromechanical equipment is upgraded toward low noise, maintenance-free operation, long service life and universal spare parts. Low-grade deep groove ball bearings suffer from rough raceway machining, poor steel ball precision and weak anti-aging sealing, leading to abnormal noise, water ingress corrosion and jamming failure in short-term operation and high rework rate of electromechanical equipment. The market urgently needs general deep groove ball bearings with high-precision raceway machining, matched precision steel balls and customized sealing for working conditions.

NMT realizes low noise at high speed, long-term waterproof & dust protection and stable composite load bearing via three core processes: ultra-precision grinding of arc raceways, forming of high-precision polished steel balls and customized sealing structure for working conditions. Finished bearings pass noise grading inspection, waterproof sealing test, high-speed durability temperature rise test and full dimensional inspection to eliminate defective products with flawed raceways, out-of-round steel balls and defective seals. It guarantees long-term stable operation of motors, water pumps and fans, cutting equipment rework frequency and spare parts replacement expenditure.

Core Product Advantages

Four-point contact raceway structure bears combined radial & bidirectional axial load, adapting to slight axial play of rotating shafts.

Full-series specification coverage including 6000 light-load, 6200 general and 6300 heavy-load types for maximum versatility.

Two sealing solutions: steel dust cover for dry indoor fans, double-lip rubber seal for waterproof & moisture-proof water pumps.

High-precision polished steel balls & precision raceways deliver low noise at high speed to meet silent demand of variable frequency motors.

Standard national standard mounting dimensions enable direct replacement for general electromechanical equipment on the market for convenient stock preparation & maintenance.

Optional C3 enlarged clearance avoids seizure failure caused by high-temperature expansion of water pumps and fans.

Two cage options (steel plate & nylon) for flexible matching of cost-effective equipment and high-end silent motors.

Pre-filled long-life grease at factory enables long-term maintenance-free operation for small-scale equipment.

Typical Application Scenarios

Bearings for Y/Y2 series three-phase industrial motors, variable frequency motors and fan-dedicated motors; Main shaft bearings for horizontal centrifugal pumps, vertical pipeline pumps, self-priming pumps and circulating water pumps; Bearings for boiler induced draft fans, cooling fans, axial flow fans and cooling tower fans; Auxiliary front-end bearings for screw air compressors and input shaft bearings for small gearboxes; Transmission bearings for agricultural tractors and harvesters; Rotary bearings for textile spinning frames and carding machines; Bearings for air compressor fans, outdoor central air conditioning fans, washing machines and small air compressor motors.

Quality Assurance

NMT deep groove ball bearings adopt overall quenching of normalized bearing steel for uniform and wear-resistant raceway hardness. Compatible with universal lithium-based grease and water-resistant extreme-pressure grease, operating temperature ranges from -35℃ to 120℃, adapting to conventional industrial and civil conditions such as continuous heat generation of motors, humid water vapor of pumps, dust accumulation on fans and seasonal temperature difference of outdoor equipment.

Product Range

6000 ultra-thin light series, 6200 standard general main series, 6300 thickened reinforced heavy-load series; Structure: single-row deep groove ball four-point contact; Precision grades: P0 general industrial grade, P6 silent precision grade for motors; Clearance: C0 standard clearance, C3 large clearance for high temperature; Sealing: open type, Z single-side steel seal, ZZ double-side steel seal, 2RS double-side rubber seal; Cages: stamped steel cage, nylon resin cage.

Brand Strength

NMT Japan solves three major pain points of ordinary deep groove ball bearings: excessive noise during high-speed operation, corrosion failure from water vapor & dust intrusion and thermal expansion seizure under high temperature. Core technologies including ultra-precision grinding of arc raceways, selection of high-precision steel balls and sealing design dedicated to working conditions develop high-quality universal deep groove ball bearings for motors, water pumps and fans. We supply bearings for motor manufacturers, water pump producers, fan equipment factories, electromechanical parts distributors and equipment maintenance service providers to reduce failure probability of general rotary equipment, extend bearing replacement cycle and cut total equipment operation & maintenance cost.