Product Description

Deep Groove Ball Bearing 6304zzcm/Nskskftimkenfag Bearing Steel Quality
NSK6304ZZCM is a common bearing model and belongs to the category of deep groove ball bearings. 

1. Model: NSK6304ZZCM
   – “NSK” indicates that the bearing is manufactured by CZPT company.
   – “ZZ” indicates a double metal shield design, providing good sealing performance.
   – “CM” indicates the internal bearing clearance is in the standard size range.

2. Type: Deep Groove Ball Bearing
   – Deep groove ball bearings are 1 of the most common types of bearings, known for their high load-carrying capacity and smooth operation.
   – They are suitable for various applications, including power tools, automotive components, machinery, etc.

3. Dimensional Parameters:
   – Inner Diameter (d): 20millimeters
   – Outer Diameter (D): 52 millimeters
   – Width (B): 15 millimeters

4. Material:
   – The inner and outer rings, as well as the rolling elements, are typically made of high-quality bearing steel to provide sufficient strength and wear resistance.

5. Features:
   – Double metal shield design (ZZ) provides effective dust and dirt protection, extending the bearing’s lifespan.
   – Standard internal bearing clearance (CM) suitable for most general applications.
   – High-quality bearing steel material provides high load-carrying capacity and wear resistance.


Model Bore Diameter Outer Diameter Width
6201ZZCM 12 mm 32 mm 10 mm
6202ZZCM 15 mm 35 mm 11 mm
6203ZZCM 17 mm 40 mm 12 mm
6204ZZCM 20 mm 47 mm 14 mm
6205ZZCM 25 mm 52 mm 15 mm
6206ZZCM 30 mm 62 mm 16 mm
6207ZZCM 35 mm 72 mm 17 mm
6208ZZCM 40 mm 80 mm 18 mm
6209ZZCM 45 mm 85 mm 19 mm
6210ZZCM 50 mm 90 mm 20 mm
6211ZZCM 55 mm 100 mm 21 mm 
6212ZZCM 60 mm 110 mm 22 mm
6213ZZCM 65 mm 120 mm 23 mm
6214ZZCM 70 mm 125 mm 24 mm
6215ZZCM 75 mm 130 mm 25 mm
6216ZZCM 80 mm 140 mm 26 mm
6217ZZCM 85 mm 150 mm 28 mm
6218ZZCM 90 mm 160 mm 30 mm
6219ZZCM 95 mm 170 mm 32 mm
6220ZZCM 100 mm 180 mm 34 mm
6301ZZCM 12 mm 37 mm 12 mm
6302ZZCM 15 mm 42 mm 13 mm
6303ZZCM 17 mm 47 mm 14 mm
6304ZZCM 20 mm 52 mm 15 mm
6305ZZCM 25 mm 62 mm 17 mm
6306ZZCM 30 mm 72 mm 19 mm
6307ZZCM 35 mm 80 mm 21 mm
6308ZZCM 40 mm 90 mm 23 mm
6309ZZCM 45 mm 100 mm 25 mm
6310ZZCM 50 mm 110 mm 27 mm

Applications of Deep Groove Ball Bearings:

Deep groove ball bearings are a common type of bearing with a wide range of applications. Here are some common applications of deep groove ball bearings:

1. Electric Motors and Engines: Deep groove ball bearings are commonly used in electric motors and engines to support the rotating motion of the rotor and withstand axial and radial loads.

2. Automotive Industry: Deep groove ball bearings are widely used in the automotive industry, including engine, transmission systems, suspension systems, wheels, and subframes.

3. Machinery Equipment: Deep groove ball bearings are suitable for various machinery equipment, such as industrial machinery, agricultural machinery, construction equipment, textile machinery, etc. They are used for power transmission, supporting rotating components, and reducing friction.

4. Pumps and Fans: Deep groove ball bearings are used in rotating equipment such as pumps and fans to support the rotation of the impeller and provide stable operation.

5. Household Appliances: Deep groove ball bearings are commonly found in household appliances such as washing machines, air conditioners, electric fans, etc., to support the rotation of motor rotors.

6. Industrial Transmissions: Deep groove ball bearings are used in various industrial transmission systems, such as gear transmissions, chain drives, etc., to support rotational motion and transmit torque.

7. Bicycles and Motorcycles: Deep groove ball bearings are widely used in bicycle and motorcycle wheels, steering systems, and engines.

These are just some common applications of deep groove ball bearings. In reality, deep groove ball bearings are widely used in various machinery and industries. Their simple structure and efficient performance make them an ideal choice for many rotating devices.

Deep groove ball bearings have several advantages:

1. High load-carrying capacity: Deep groove ball bearings can withstand both radial and axial loads, making them suitable for various load conditions.

2. Low friction and high efficiency: Deep groove ball bearings have a ball-and-groove structure, resulting in low frictional losses and providing high speed and operational efficiency.

3. Axial stability: The structure of deep groove ball bearings offers good axial stability, allowing them to withstand axial forces and prevent axial displacement.

4. Simplified installation and maintenance: Deep groove ball bearings have a simple structure, making them easy to install and dismantle, saving time and costs. Additionally, they often do not require additional lubrication or sealing devices.

5. Diverse applications: Deep groove ball bearings are widely used in various industries and fields, including machinery, automotive, power tools, and household appliances, meeting different application requirements.

6. High reliability and durability: Deep groove ball bearings are made of high-quality materials and undergo precision manufacturing, ensuring excellent reliability and durability to maintain stable performance during long-term operation.

In summary, deep groove ball bearings offer advantages such as high load-carrying capacity, low friction and high efficiency, axial stability, simplified installation and maintenance, diverse applications, and high reliability and durability. These characteristics make them a crucial type of bearing widely used in various industrial sectors.


1.What is the minimum order quantity for this product?
Can be negotiated, we will try our best to meet customer needs.Our company is mainly based on wholesale sales, most customers’orders are more than 1 ton.

2.What is your latest delivery time?
Most orders will be shipped within 3-5 days of payment being received.

3.Does your company have quality assurance?
Yes, for 1 years.

4.Are you a factory or a trading company?
We have our own cooperative factory, and our business type is a combination of manufacturing and trading.

5.What is the competitiveness of your company’s products compared to other companies?
High precision, high speed, low noise.

6.What are the advantages of your company’s services compared to other companies?
Answer questions online 24 hours a day, reply in a timely manner,  100% after-sales service.

7.Which payment method does your company support?
Do our best to meet customer needs, Can be negotiated.

8.How to contact us quickly?
Please send us an inquiry or message and leave your other contact information, we will contact you as soon as possible and provide the detailed information you need.

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Bearing Type: Deep Groove Ball Bearing
Bore Diameter: 20mm
Outer Diameter: 52mm


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steel ball bearing

How do steel ball bearings enhance the overall efficiency and functionality of machinery and equipment?

Steel ball bearings play a crucial role in enhancing the overall efficiency and functionality of machinery and equipment. They provide various benefits that improve performance, reduce friction, and enable smooth operation. Here are some ways in which steel ball bearings enhance the efficiency and functionality of machinery and equipment:

1. Friction Reduction:

Steel ball bearings are designed to minimize friction between moving parts. The rolling motion of the steel balls reduces the contact area and frictional resistance compared to sliding contact. This reduction in friction results in less energy loss and improved mechanical efficiency. By reducing friction, steel ball bearings help optimize the operation of machinery and equipment, leading to lower energy consumption and increased overall efficiency.

2. Load Distribution:

Steel ball bearings distribute loads evenly across their contact surfaces. This load distribution capability allows machinery and equipment to handle higher loads without excessive wear or premature failure. By evenly distributing the applied loads, steel ball bearings help prevent localized stress concentrations, prolonging the service life of the equipment and reducing the need for frequent maintenance or replacements.

3. High-Speed Capability:

Steel ball bearings are well-suited for high-speed applications. The rolling element design and low friction characteristics allow steel ball bearings to operate efficiently at high rotational speeds. They can withstand the centrifugal forces generated at high speeds while maintaining stability and precision. The ability of steel ball bearings to handle high speeds enables machinery and equipment to operate at optimal performance levels, resulting in improved productivity and throughput.

4. Precision and Accuracy:

Steel ball bearings contribute to the precision and accuracy of machinery and equipment. The uniform size and shape of the steel balls, combined with precise manufacturing tolerances, result in consistent and predictable bearing performance. This precision allows for accurate positioning, smooth motion control, and reliable operation of machinery and equipment. Whether it’s in machine tools, robotics, or other precision applications, steel ball bearings help maintain the required levels of precision and accuracy.

5. Vibration and Noise Reduction:

Steel ball bearings help reduce vibration and noise levels in machinery and equipment. The rolling motion of the steel balls dampens vibrations generated during operation, leading to smoother and quieter performance. Reduced vibration and noise levels not only improve user comfort but also minimize the risk of damage to sensitive components and increase the overall reliability of the equipment.

6. Versatility and Adaptability:

Steel ball bearings are available in various configurations, sizes, and designs, making them versatile and adaptable to different applications. Manufacturers offer a wide range of bearing types, such as deep groove ball bearings, angular contact ball bearings, and thrust ball bearings, to suit specific requirements. This versatility allows machinery and equipment designers to select the most appropriate steel ball bearings based on factors such as load capacity, speed, space limitations, and operating conditions. The ability to choose from a diverse range of steel ball bearing options ensures optimal performance and functionality in different industrial sectors.

7. Maintenance and Serviceability:

Steel ball bearings simplify maintenance and serviceability of machinery and equipment. Their durability and resistance to wear minimize the need for frequent maintenance or replacement. Additionally, steel ball bearings can be easily accessed, inspected, and replaced when necessary, reducing downtime and maximizing operational efficiency. Proper lubrication and periodic maintenance of the bearings help ensure their long-term performance and extend the service life of the machinery and equipment.

By enhancing efficiency, reducing friction, enabling high-speed operation, providing precision and accuracy, reducing vibration and noise, offering versatility and adaptability, and simplifying maintenance, steel ball bearings contribute significantly to the overall efficiency and functionality of machinery and equipment in various industries.

steel ball bearing

How do steel ball bearings perform in high-speed or high-load applications?

Steel ball bearings are engineered to perform reliably in both high-speed and high-load applications. Let’s explore how these bearings handle such demanding conditions:

High-Speed Applications:

In high-speed applications, steel ball bearings are designed to minimize friction and maintain stability, allowing for smooth and efficient operation. The key factors that contribute to their performance in high-speed applications include:

  • Cage Design: Steel ball bearings often incorporate a cage or separator that holds the balls in position. The cage design is optimized to reduce friction, minimize ball-to-ball contact, and prevent excessive heat generation at high speeds.
  • Ball Material and Quality: Steel ball bearings use precision steel balls that are manufactured to strict tolerances. The balls are typically made from high-quality bearing steel, ensuring uniformity, roundness, and smooth surfaces. These characteristics reduce rolling resistance and enable reliable performance at high speeds.
  • Lubrication: Proper lubrication is crucial for high-speed applications. Lubricants with low viscosity and high-temperature resistance are selected to minimize friction and heat buildup. Lubrication also aids in dissipating heat generated during operation, preventing bearing damage.
  • Bearing Preload: In high-speed applications, bearing preload is often applied to maintain proper contact between the balls and raceways. Preload helps to eliminate internal clearance and minimize ball skidding, ensuring stable operation and reducing the risk of vibrations or premature failure.

High-Load Applications:

Steel ball bearings are also designed to handle high-load applications, where heavy forces are exerted on the bearings. Here are the factors that contribute to their performance in high-load conditions:

  • Material Strength: Steel ball bearings are typically made from high-strength bearing steels that can withstand significant loads without deformation or failure. These steels are engineered to have excellent hardness, toughness, and fatigue resistance, ensuring reliable performance under heavy loads.
  • Bearing Geometry: The geometry of steel ball bearings is optimized to distribute and support the load evenly across the balls and raceways. This design helps minimize stress concentrations and prevents premature wear or fatigue failure in high-load conditions.
  • Cage Design: The cage or separator in steel ball bearings also plays a role in high-load applications. It helps maintain proper ball spacing and alignment, ensuring efficient load distribution and reducing the risk of ball-to-ball contact or skewing under heavy loads.
  • Lubrication: Adequate lubrication is essential to reduce friction and prevent excessive heat generation in high-load applications. Lubricants with high viscosity and extreme pressure additives are commonly used to provide a protective film between the balls and raceways, minimizing wear and extending the bearing’s lifespan.
  • Bearing Clearance: In high-load applications, bearing clearance is carefully selected to accommodate the expected load and prevent excessive internal play. Proper clearance ensures that the bearing can effectively handle the applied load without compromising performance or causing premature failure.

By considering factors such as cage design, ball material, lubrication, preload, geometry, and clearance, steel ball bearings are engineered to perform reliably in both high-speed and high-load applications. These bearings are capable of withstanding the demanding conditions and providing smooth operation, reduced friction, and extended service life in challenging industrial environments.

steel ball bearing

How do steel ball bearings contribute to reduced friction and smooth operation in machinery?

Steel ball bearings play a critical role in reducing friction and ensuring smooth operation in various machinery and mechanical systems. Let’s explore how steel ball bearings achieve these benefits:

1. Rolling Motion: Steel ball bearings operate on the principle of rolling motion. The small spherical balls within the bearing roll between the inner and outer raceways, rather than sliding against each other. This rolling motion significantly reduces friction compared to sliding friction that occurs in plain bearings or bushings. As a result, steel ball bearings minimize energy losses due to friction and enable more efficient operation of machinery.

2. Point Contact: Steel ball bearings feature point contact between the balls and the raceways. This means that only a small area of the ball is in contact with the raceway at any given time. Point contact reduces the contact surface area and, consequently, the frictional resistance. The reduced friction allows the bearing to rotate more freely and with minimal energy loss.

3. Lubrication: Proper lubrication is crucial for the smooth operation of steel ball bearings. Lubricants such as grease or oil are used to reduce friction and wear between the balls and the raceways. Lubrication forms a thin film between the contacting surfaces, providing a barrier that prevents direct metal-to-metal contact. This lubricating film further reduces friction and dissipates heat, improving the overall performance and longevity of the bearing.

4. Precision Manufacturing: Steel ball bearings are manufactured with high precision and tight tolerances. The dimensions, roundness, and surface finish of the balls and raceways are carefully controlled during the manufacturing process. This precision ensures that the balls roll smoothly and with minimal resistance within the bearing. The precise fit between the balls and the raceways contributes to reduced friction and promotes smooth operation.

5. Material Properties: Steel ball bearings are typically made from high-quality steel alloys that exhibit excellent mechanical properties. The steel used in ball bearings is hardened and heat-treated to enhance its strength, durability, and resistance to wear. These material properties allow the bearings to withstand high loads and provide reliable performance over extended periods. The smooth and hard surface of the steel balls also reduces friction and wear between the balls and the raceways.

6. Cage or Retainer: In many steel ball bearings, a cage or retainer is used to separate and maintain proper spacing between the balls. The cage prevents the balls from touching or rubbing against each other, ensuring smooth rolling motion. It also helps to distribute the load evenly among the balls, reducing stress concentrations and minimizing frictional resistance.

7. Noise and Vibration Reduction: Steel ball bearings contribute to the reduction of noise and vibration in machinery. The rolling motion of the balls and the precise fit between the balls and raceways minimize the occurrence of undesirable vibrations and noise generated by friction. This is particularly important in applications where quiet operation is essential, such as in precision machinery or automotive components.

In summary, steel ball bearings reduce friction and enable smooth operation in machinery through rolling motion, point contact, proper lubrication, precision manufacturing, high-quality materials, the use of cages or retainers, and noise/vibration reduction. These factors combined make steel ball bearings essential components in a wide range of applications, contributing to improved efficiency, durability, and performance of machinery and mechanical systems.

China supplier Deep Groove Ball Bearing 6304zzcm/Nskskftimkenfag Bearing Steel Quality   with Hot sellingChina supplier Deep Groove Ball Bearing 6304zzcm/Nskskftimkenfag Bearing Steel Quality   with Hot selling
editor by CX 2024-05-15

Steel Ball Bearings

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