1. Industry Working Condition Pain Points

In general rotating equipment such as automated production lines, conveyor systems, fans, pumps, motors and home appliances, deep groove ball bearings are the most common yet most easily overlooked critical components. Many equipment may appear to operate normally but suffer from persistent issues such as excessive bearing noise, elevated temperature rise and scattered batch-to-batch service life. The same bearing model can perform significantly differently across different equipment—some remain quiet after thousands of hours, while others develop abnormal noise or vibration within just a few hundred hours. Equipment managers find it difficult to accurately predict bearing replacement cycles, resorting to "scheduled replacement" strategies that either waste spare parts or risk sudden failures.

 

Domestic ordinary deep groove ball bearings commonly suffer from insufficient raceway waviness control, poor ball dimensional consistency, weak cage strength and随意 grease filling quantities. These seemingly minor process defects are amplified into noise, vibration and scattered service life during high-speed continuous operation. Imported brand products offer good performance, but the cost pressure for large-volume general equipment supporting cannot be ignored. With the trend toward higher production line speeds and greater equipment precision, general equipment equally requires precision deep groove ball bearings with low noise, consistent service life and high cost performance.

 

2. Product Core Positioning

NMT deep groove ball bearings leverage Japanese precision bearing manufacturing experience to introduce precision bearing standards into the general deep groove ball bearing segment. Raceways undergo ultra-precision grinding and mirror-grade polishing, with surface roughness consistently controlled to extremely low levels. Balls are multi-stage ground and precision-graded, achieving excellent dimensional consistency and sphericity accuracy, reducing rolling friction to its theoretical limit.

 

High-purity special steel undergoes vacuum degassing refining, with non-metallic inclusions controlled to extremely low levels. Gradient heat treatment processes give raceways uniform hardened layers—the "hard exterior, tough interior" material characteristic ensures raceways resist wear under loads while the core resists cracking under impacts. Comprehensive 62 and 63 series cover bore diameters from 10mm to over 120mm. Precision grades P0 to P4 are available to meet different requirements from general equipment to precision instruments. Open, single-seal, double-seal and dust cover configurations flexibly adapt to different operating conditions. On continuously operating automated production lines, NMT deep groove ball bearings provide sustained stable low-noise operation and predictable service life, freeing equipment managers from the passive maintenance of frequent bearing replacement and allowing them to focus on more valuable line optimisation efforts.

 

3. Structural Classification & Functional Advantages

(1) Open Deep Groove Ball Bearings

 

With no sealing elements to block airflow, heat dissipation is maximised with the highest limiting speed. Suitable for high-temperature environments, high-speed operation and applications requiring regular grease replenishment. NMT open bearings, with ultra-precision machining and high-purity materials, maintain extremely low friction loss and stable temperature rise curves even in open configurations.

 

(2) Shielded Deep Groove Ball Bearings (ZZ Type)

 

Double-sided metal dust shields with non-contact structure, effectively blocking large-particle dust and foreign matter intrusion. Suitable for indoor motors, fans, pumps, conveyor equipment and other general equipment with moderate dust environments, striking a good balance between dust protection and low friction.

 

(3) Sealed Deep Groove Ball Bearings (2RS Type)

 

Double-sided rubber contact seals providing excellent dust-proof, water-proof and oil-mist resistance. Suitable for outdoor equipment, humid environments, food processing auxiliary equipment and other applications requiring reliable sealing protection. Contact seals provide reliable protection while friction torque is controlled within reasonable limits, not significantly increasing energy consumption.

 

(4) Stainless Steel Deep Groove Ball Bearings

 

Both rings and balls are manufactured from stainless steel, providing excellent corrosion resistance. Suitable for food processing equipment, medical devices, chemical auxiliary equipment, outdoor instruments and other applications requiring corrosion resistance.

 

General advantages summary: Classic structure widely adaptable to various rotating equipment; ultra-precision raceways and high-precision balls ensure smooth low-noise operation; multiple seal types flexibly adapt to different operating conditions; precision grades cover P0 to P4; high-purity materials and gradient heat treatment ensure long service life and high reliability.

 

4. Two-Grade Material & Process Selection

Grade 1: Through-Hardened Bearing Steel (General Version)

 

Integral quenching and low-temperature stabilizing tempering achieve uniform raceway hardness and excellent ball wear resistance. Suitable for motors, fans, pumps, conveyor equipment, home appliances and other conventional conditions, with outstanding cost performance as the preferred solution for mass production supporting.

 

Grade 2: Carburized Bearing Steel (Reinforced Version)

 

Rings undergo deep carburizing quenching for high surface hardness and wear resistance with a tough core for impact resistance. Suitable for construction machinery auxiliary equipment, mining conveyor drums and impact-type load applications, withstanding instantaneous impacts and vibration, with significantly extended service life under harsh conditions.

 

5. Japanese Precision Manufacturing Process

Vacuum degassing refining of high-purity special steel forging, controlling non-metallic inclusions to extremely low levels;

 

Precision forging + gradient heat treatment, achieving uniform raceway hardness with good core toughness—the "hard exterior, tough interior" characteristic balancing wear resistance and impact resistance;

 

Fully closed-loop ultra-precision grinding system with nanoscale online measurement, achieving sub-micron raceway geometry accuracy;

 

Multi-stage grinding and precision grading of balls, achieving excellent dimensional consistency and sphericity accuracy;

 

Superfinishing and mirror-grade polishing of raceways, with surface roughness consistently controlled below Ra≤0.04μm;

 

Precision cage machining with accurate pocket dimensions and smooth guidance, reducing rolling element collision and noise;

 

Assembly in temperature-controlled dust-free workshops with precise clearance control (C2, CN, C3 available);

 

100% full inspection including torque, vibration, rotational accuracy and run-in tests, with complete data archived.

 

Precision grades cover P0, P6, P5 and P4. 62 and 63 series dimensions comply with international standards for direct interchange with mainstream deep groove ball bearings.

 

6. Application Scenarios & Precision Selection Guide

P0 Grade (General Precision) : General motors, fans, water pumps, agricultural machinery, construction machinery and other applications with low precision requirements;

 

P6 Grade (Medium Precision) : Automated conveyor equipment, packaging machinery, textile machinery, general machine tool auxiliary drives and more;

 

P5 Grade (Higher Precision) : Precision motors, CNC machine tool auxiliary shafts, printing machinery, medical equipment auxiliary rotation and more;

 

P4 Grade (High Precision) : High-speed electric spindle auxiliary support, precision instruments, optical equipment, measurement devices and more.

 

Specification selection: 62 series (light series, suitable for medium-low speed light loads), 63 series (heavy series, suitable for medium-high speed heavy loads), thin-section series (6700, 6800, suitable for compact spaces).

 

7. Wide Application Fields

Motors & Generators: Industrial motors, servo motors, spindle motors, generators—high-speed continuous operation;

Fans & Pumps: Centrifugal fans, axial fans, water pumps, oil pumps—long-term continuous operation;

Automation Equipment: Conveyor rollers, AGV wheels, packaging machinery, pick-and-place machines—24/7 continuous operation;

Home Appliances & Office Equipment: Washing machine motors, air conditioner fans, printers, copiers—low noise long life;

Instruments & Meters: Measuring equipment, optical instruments, laboratory equipment—high precision low vibration;

Construction Machinery Auxiliary Equipment: Cooling fans, auxiliary drives, hydraulic pumps—durable and reliable;

Food & Medical Equipment Auxiliary: Food conveyor auxiliary, medical equipment auxiliary rotation—hygienic and corrosion-resistant.

 

8. Brand Supply & Customisation Service

NMT maintains sufficient spot inventory of mainstream 62 and 63 series deep groove ball bearings for urgent equipment repair and mass complete machine supporting with short lead time. Customisation services include special clearance (C2/C3), special precision grades (P5/P4), high/low temperature grease, stainless steel materials, special sealing solutions, non-standard sizes and more. Professional engineers provide targeted selection schemes based on equipment speed, load, temperature and environment to optimise bearing configuration, reduce noise and vibration, extend service life and cut the overall life cycle cost of equipment.