Deep groove ball bearings are the most widely used standard bearings, adopting an integrated structure of single-row steel balls and arc deep groove raceways. They bear radial loads as well as bidirectional light axial loads, featuring low rotation resistance, high limiting speed and excellent mute performance. With simple structure and easy installation, they adapt to countless scenarios. Available in open type, ZZ metal shield and 2RS rubber seal, with standard C0 clearance and high-temperature C3 large clearance. The size range covers miniature instrument bearings to large industrial heavy-duty bearings, serving as basic rotating parts for industrial motors, water supply pumps, cooling fans, air compressors, electric vehicles, auxiliary components of construction machinery, household appliances and textile machinery.

Main model classification: 6000 ultra-thin light series, 6200 standard general main series, 6300 thickened heavy-duty series. Sealing types: OPEN open type, ZZ double-sided metal dust cover, 2RS double-sided rubber contact oil seal. Supplementary models: 6400 extra-heavy series, 618/619 thin-wall miniature series for compact installation space.

Compared with spherical roller bearings and cylindrical roller bearings: ultra-low friction coefficient, low heat generation during high-speed rotation and quiet operation with economic cost. Versus angular contact ball bearings, paired installation is unnecessary with balanced axial force and low assembly difficulty. Limitation: limited axial load capacity, unable to withstand heavy impact loads and eccentric heavy loads; sealed versions require periodic maintenance under heavy dust and water environments.

General electromechanical equipment, civil electrical appliances and small construction machinery operate under continuous high-speed rotation, alternating dry-wet conditions, dust contamination and frequent start-stop cycles. Inferior deep groove ball bearings suffer rough raceway machining and out-of-round steel balls, causing sharp howling noise at high speed. Fragile cages deform and crack under long-term high centrifugal force, leading to ball shedding. Excessive fitting clearance of sealing covers allows water vapor and dust ingress to deteriorate and dry lubricating grease, resulting in seized pump bearings from rust, overheating & abnormal noise of motors, unbalanced fan vibration and excessive noise of household fans, premature equipment scrapping and increased parts replacement & maintenance costs.

NMT deep groove ball bearings cover full-size range including thin-wall miniature, standard general and thickened heavy-duty models. Manufactured with high-purity bearing steel via integral quenching and tempering. Super-precision grinding on raceways delivers smooth arc contour. High-grade precision steel balls are adopted with strict size sorting within one bearing unit for ultra-low rotational runout. Reinforced stamped steel cages resist high-speed fracture. Closely stamped ZZ metal shields block coarse dust. Double-lip 2RS rubber oil seals achieve outstanding water, mud and fine dust resistance. C3 large-clearance variants are customized for high-temperature motors and pump bodies to eliminate seizure from thermal expansion. All dimensions comply with national standards for direct replacement of mainstream brand bearings, supporting mass production assembly, equipment maintenance replacement, household appliance renovation and agricultural machinery maintenance.

General electromechanical products are upgraded toward mute operation, long-term maintenance-free service, miniaturization & lightweight design and all-weather durability. Low-end inferior deep groove ball bearings have poor raceway precision, low-precision steel balls and insufficient sealing performance, leading to loud high-speed noise and premature failure from water & dust intrusion. They fail to meet demands such as long-term mute operation of variable-frequency motors, outdoor damp operation of water pumps, 24-hour continuous operation of fans and stable long-term service of household devices. The market demands general deep groove ball bearings with high precision, low noise and reliable sealing.

Mirror superfinishing on NMT raceways ensures smooth steel ball movement to greatly reduce friction noise and temperature rise. Thickened stamped cages enhance structural strength to resist start-stop impact and high centrifugal force. Tightly fitted double-lip rubber sealing lips slow grease loss and pollutant intrusion. Pre-filled long-life composite grease during production enables long maintenance-free service under normal temperature. Precision dimension sorting ensures consistent radial clearance to suppress high-speed vibration.

All finished bearings pass raceway contour inspection, steel ball precision verification, high-speed noise test and waterproof sealing durability test to eliminate defective products with raceway burrs, out-of-round balls and seal leakage, ensuring stable, quiet and long-term operation of various general rotating components.

Core Product Advantages

Classic arc deep groove structure bears radial and bidirectional light axial loads simultaneously; single bearing fits conventional composite stress for simple assembly.

Low rotational friction resistance and high limiting speed reduce temperature rise for motors and fans at high speed to save power consumption.

Multiple sealing options: OPEN for oil bath lubrication, ZZ metal shield for dust prevention, 2RS rubber oil seal for water & dust proofing for flexible scenario matching.

High-precision steel balls + superfinished raceways deliver low overall operation noise for mute motors, household fans and precision instruments.

Reinforced steel cages resist impact and high-speed deformation to extend service life for frequently started & stopped equipment.

Pre-filled long-life grease for sealed versions realizes maintenance-free operation under conventional working conditions.

Custom C3 large-clearance models adapt to high-temperature motors, oil pumps and high-temperature fans to avoid jamming from thermal expansion.

Standard national dimensions with full versatility for direct interchange with standard bearings across all industries.

Typical Application Scenarios

Spindle support bearings for three-phase asynchronous motors, variable-frequency motors and servo motors; pump body bearings for clean water pumps, sewage pumps, oil pumps and booster pumps; bearings for cooling fans, centrifugal fans, axial fans and industrial exhaust fans; auxiliary bearings for air compressors, vacuum pumps and gearboxes; wheel hub & motor bearings for electric tricycles and motorcycles; bearings for air conditioner outdoor units, washing machines, refrigerators and ventilation fans; general bearings for textile machinery, conveyor idlers, small agricultural machinery and garden machinery.

Quality Assurance

NMT deep groove ball bearings adopt vacuum-degassed bearing steel to reduce internal impurities and delay fatigue pitting. Precision grading and matching of rolling steel balls ensure uniform load distribution. Cages are formed by stamping thick cold-rolled steel plates for excellent deformation resistance. Sealing grades (dust-proof/waterproof) are selected according to actual needs. Compatible with grease lubrication and circulating oil lubrication, no installation direction limitation for reversible assembly. Fully applicable to continuous high-speed rotation, mild-to-moderate composite load, dusty & humid environment and frequent start-stop general working conditions.

Product Range

6000 ultra-thin series, 6200 standard main series, 6300 thickened heavy-duty series, 6400 extra-heavy series, 618/619 thin-wall miniature series; Structures: OPEN open type, ZZ double-sided metal shield, 2RS double-sided rubber seal; Clearance: C0 standard clearance, C3 high-temperature large clearance.

Brand Strength

NMT Japan resolves four common defects of ordinary deep groove ball bearings: harsh high-speed noise, cage fracture & ball shedding, rust failure from water & dust ingress and high-temperature thermal seizure. Process upgrades including mirror superfinishing of raceways, precision steel ball matching, reinforced cages and multi-layer sealing protection deliver low-noise, high-speed, water & dust resistant and long-lasting general bearing performance. We supply standard deep groove ball bearings for motor manufacturers, water pump factories, fan enterprises, home appliance component suppliers and electromechanical maintenance merchants to reduce equipment operating noise, early bearing failure rate and maintenance frequency, helping downstream manufacturers cut component costs and after-sales service pressure.