Deep groove ball bearings are assembled from inner rings, outer rings, steel balls and cages. Featuring simple and mature structure, they enjoy the widest range of applications. The bearings can bear radial loads and slight bidirectional axial loads simultaneously. They deliver low rotational friction, excellent limiting speed and low operating noise with outstanding high-speed performance. Multiple sealing structures are available to prevent dust and moisture from entering the bearing interior, making them suitable for general power machinery under relatively stable working conditions. They serve as standard core supporting components for industrial motors, centrifugal fans, water pumps, reducers and conveying equipment as well as light industrial machinery. The products are widely used in variable frequency motors, cooling fans, circulating water pumps, air compressors, textile machinery, food processing equipment, small gearboxes and various automatic conveying devices.

Compared with cylindrical roller bearings, deep groove ball bearings adopt point contact structure with lighter weight and lower friction coefficient, making them suitable for medium-high speed and medium-load conditions. Different from self-aligning ball bearings, deep groove raceways provide higher load capacity and stable rigidity, while lacking self-aligning capacity, which requires certain coaxial precision between shafts and bearing housings. Most general electromechanical equipment needs long-term continuous stable operation with strict requirements on bearing vibration, noise and temperature rise. Large dimensional dispersion of steel balls or insufficient surface finish of raceways will easily cause continuous abnormal noise and excessive temperature rise during high-speed operation, shorten the service life of grease and lead to premature bearing failure. Ordinary deep groove ball bearings on the market often suffer from insufficient clearance control precision and poor wear resistance of seals. Grease tends to deteriorate and leak in dusty and humid environments, increasing equipment maintenance frequency.

NMT Deep Groove Ball Bearings feature a complete product portfolio, including open type, single-side rubber seal 2RS, double-side rubber seal 2RS and metal shield ZZ. Normal clearance and enlarged C3 clearance are available. Stamped steel cages are optional. Specifications cover miniature, small, medium-standard and large general bearings, fully meeting assembly demands of motors, fans, water pumps and automatic equipment.

With continuous upgrading of general automation industry, various small and medium driving equipment develop toward miniaturization, high speed and low noise. Market requirements for bearing operating noise, durability, dust and moisture resistance keep rising. Many electromechanical devices have compact installation space without complex protection structures. Bearings need to rely on built-in seals to resist external contaminants, maintain stable operating temperature for a long time and reduce maintenance shutdowns. Conventional deep groove ball bearings have limited machining precision on raceways and loose sorting standards for steel balls. Vibration and overheating easily occur after long-term high-speed operation, failing to satisfy long-term requirements of silent motors and precision fans. Manufacturers are in urgent need of high-quality deep groove ball bearing solutions featuring low noise, long service life and reliable sealing performance.

NMT Deep Groove Ball Bearings adopt optimized deep groove arc profiles to improve contact status between steel balls and raceways and evenly distribute contact stress. High-precision grading and screening for steel balls strictly control dimensional deviation. Ultra-precision mirror grinding is carried out on inner and outer raceways to reduce surface friction coefficient. Heat treatment technology is continuously optimized to balance hardness and toughness of steel. The lip structure of seals is improved to enhance fitting tightness and wear resistance, block dust and moisture intrusion and reasonably control frictional heat generation, delivering stable and reliable support guarantee for all kinds of medium-high speed general machinery.

NMT Deep Groove Ball Bearings consist of inner rings, outer rings, precision steel balls and stamped steel cages. Continuous arc deep raceways can sustain radial loads and bidirectional axial loads at the same time. Open bearings facilitate on-site grease replenishment. ZZ metal shields are suitable for dry and clean environments. 2RS rubber seals provide excellent dustproof and waterproof performance for dusty and humid working conditions. Standard clearance is adopted for regular motor equipment, while C3 clearance fits high-speed power units prone to temperature rise. High-precision steel balls cooperate with precision-ground deep raceways to realize smooth rotation and low vibration noise. All steel balls undergo precise grading screening before assembly to ensure highly unified dimensions within each bearing and avoid unbalanced force during operation. The products are extensively applied in industrial motors, cooling fans, water pumps, air compressors, textile machinery, automatic conveying equipment and small gearboxes.

High-purity bearing chromium alloy steel is selected for inner rings, outer rings and steel balls. Repeated forging refines internal grain structure. Accurate constant-temperature quenching and tempering balance surface hardness of raceways and matrix toughness to resist fatigue pitting caused by alternating loads. Multi-layer ultra-precision grinding is implemented on inner and outer raceways to optimize surface micro-texture, ensure stable formation of lubricating oil film and restrain frictional temperature rise under high-speed operation. All finished products pass geometric dimension inspection, steel ball grouping verification, radial clearance sorting, high-speed silent temperature rise test and sampling durability verification. Defective workpieces are eliminated to guarantee consistent performance of mass-produced bearings.

Various seal types and clearance specifications are optional. Standard international outer dimensions ensure excellent interchangeability for convenient assembly, maintenance and replacement of all kinds of electromechanical equipment.

Core Product Advantages

Classic deep groove arc structure bears radial loads and slight bidirectional axial loads, with wide application range.

Low rotational friction, high limiting speed, low vibration and noise, suitable for medium-high speed silent equipment.

Multiple structures including open type, ZZ metal shield and 2RS double rubber seal adapt to clean, dusty and humid environments.

Standard clearance and enlarged C3 clearance optional for regular equipment and high-speed heating units.

High-precision grading screening of steel balls ensures outstanding dimensional consistency, smooth rotation and effective noise reduction.

Ultra-precision mirror grinding on inner and outer raceways reduces friction loss and control temperature rise during long-time operation.

Premium bearing chromium alloy steel combined with mature heat treatment achieves excellent fatigue resistance and wear resistance for extended service life.

Standardized outer dimensions with high universality, widely applicable to motors, fans, water pumps and light industrial automation machinery.

Typical Application Scenarios

Variable frequency industrial motors, cooling fans, centrifugal induced draft fans; clean water pumps, oil pumps, small air compressors; textile machinery, food processing machinery; automatic production lines, conveyor rollers; small reducers and gearboxes; office equipment, auxiliary hydraulic devices for construction machinery; drive assemblies of household appliances.

Quality Assurance

Raw materials of NMT Deep Groove Ball Bearings receive sampling inspection for hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision mirror grinding of raceways. All precision steel balls are graded and grouped according to high-precision standards to guarantee uniform load distribution under high-speed operation. Seals and cages pass wear resistance, temperature resistance and anti-aging tests after forming. All finished goods pass visual inspection, clearance screening, vibration & noise detection and high-speed endurance temperature rise test. Non-conforming products are separated independently. Every deep groove ball bearing rotates smoothly with controllable noise and reliable sealing, supporting long-term continuous stable operation of general electromechanical equipment.

Product Range

Open type, ZZ metal shield, 2RS rubber sealed deep groove ball bearings; standard clearance and C3 clearance optional; stamped steel cages; specifications cover miniature, small, medium-small and large general deep groove ball bearings. Model selection depends on load magnitude, rotating speed, dust & humidity level of environment and demands for grease refilling.

Brand Strength

NMT focuses on R&D and manufacturing of general precision bearings. Targeting operating characteristics of motors, fans, water pumps and other general machinery including medium-high continuous speed and dusty humid environments, NMT continuously optimizes raceway arc profiles, steel ball sorting standards, sealing structures and heat treatment processes. It solves common industry problems such as excessive noise at high speed, seal leakage and premature fatigue damage after long-term operation. NMT helps machinery manufacturers improve overall equipment quality, extend maintenance cycles and cut after-sales maintenance costs.