Product Description



Simple structure, easy to use;
Small friction coefficient and higher limit revolving speed;
The most mature technology, extremely low noise level
Not resistant to impact, not suitable for heavy loads;
Heavy-duty design improves bearing load capacity and prolongs service life.


Product Description

Deep groove ball bearings are the most commonly used rolling bearings, belong to non-separated bearings, which are simple structure, easy to use and low price. Basic deep groove ball bearings are composed of inner ring, outer ring, steel balls, and cage. The cages are mostly stamped steel corrugated cages or engineering plastic solid cages, while large bearings use metal solid cages.

There are 2 types of deep groove ball bearings, single-row and double-row. The structure is also divided into 2 types: open type and closed type. The open type means that the bearing is not sealed; the closed type means that it has seal. There are 2 types of sealing structure: dust-proof seal and oil-proof seal.          


Double row deep groove ball bearings are similar in design to single row deep groove bearings. It consists of outer ring, inner ring, cage and double row steel balls. Double row deep groove ball bearings mainly bear radial loads and can also bear bidirectional axial loads.

Double row deep groove ball bearings are suitable for bearing arrangements where the load capacity of a single row deep groove ball bearing is insufficient. For the double row deep groove ball bearing with the same outer diameter and inner diameter as the deep groove ball bearing, its width is larger and the load capacity is also much higher than that of the single row deep groove ball bearing of the 62 and 63 series.

Double row deep groove ball bearings can only tolerate an angular misalignment of 2 minutes of arc. Larger angular misalignment can overload the balls and raceways, shorten bearing life, and cause increased noise.


Main applications:
Automobiles, agricultural machinery, machine tools, motors, water pumps, textile machinery and other fields.



Product Parameters

Type Dimension  
Basic Load Ratings
d D T
dynamic static
C Co
6205 25 52 15 14.00 7.850
6206 30 62 16 19.50 11.300
6207 35 72 17 25.70 15.300
6208 40 80 18 29.10 17.800
6209 45 85 19 32.50 20.400
6210 50 90 20 35.00 23.200
6211 55 100 21 43.50 29.200
6212 60 110 22 52.50 36.000
6213 65 120 23 58.50 40.500
6214 70 125 24 63.70 45.000
6215 75 130 25 68.90 49.000
6305 25 62 17 21.20 10.900
6306 30 72 19 26.70 15.000
6307 35 80 21 33.50 191.000
6308 40 90 23 40.50 24.000
6309 45 100 25 53.00 32.000
6310 50 110 27 62.00 38.5000
6311 55 120 29 74.10 45.000
6312 60 130 31 85.20 52.000
6313 65 140 33 97.50 60.000
6314 70 150 35 111.00 68.000
6315 75 160 37 119.00 76.5000

This parameter table is not complete, please contact us for details

Company Profile

ZheJiang CZPT Machinery Co., Ltd, Xihu (West Lake) Dis. High-precision Bearings Co., Ltd belongs to CZPT group. It is located in Industrial Development Zone of Liao-cheng city, which is bearings manufacturing base in China. We have been specialized in the production of auto parts, bearings and retainers since year 1986.

Our factory covers an area of 120,000 sq.m, with a construction area of 66,000 sq.m. There are more than 600 employees, 50 management personnel, 80 technical engineers and 60 quality inspectors. We are famous manufacturer group for our strict quality control system and hard-working team.

There are more than 40 sets of high-precision mold processing equipment, 150 sets of various CNC lathes, 200 sets of white dynamic grinding machines, 120 sets of stamping equipment, 16 sets of special demagnetization machines, 10 sets of high-pressure spray cleaning machines, 6 sets ultrasonic cleaning machines and 6 automatic bearing grinding lines. They are also equipped with advanced hardness tester, length measuring instrument, sine instrument, spectrometer, infrared carbon and sulfur analyzer, CZPT hardness tester, roughness profiler, electronic tensile testing machine, metallographic microscope, projection coordinate instrument, roundness instrument, ABLT-2 life testing machine, three-coordinate testing machine and so on. We are ready to provide customers with high-quality precision bearing products.

Our company passed ISO9001, ISO/TS16949 and IATF16949 quality management system. Our products are CE / SGS certified. Through introducing world-leading technology and bring together domestic high-tech talents, it ensures our rapid growth and competitive advantages.

Sincerely wish you visit our factory!


Q1: Do you provide samples? Is it free or extra?
Yes, we can provide a small amount of free samples. Do you mind paying the freight?

Q2: Can you accept OEM or Non-Stand Bearings ?
Any requirement for Nonstandard roller bearings is easily fulfilled by us due to its vast knowledge and links in the industry.

Q3: What is your latest delivery time?
Most orders will be shipped within 7-15 days of payment being received.

Q4:Does your company have quality assurance?
Yes, for 1 years.

Q5:Which payment method does your company support?
T/T is best, but we can also accept L/C and Western Union.

Q6:How to contact us quickly?
Please send us an inquiry or message and leave your other contact information, such as phone number,  account or account, we will contact you as soon as possible and provide the detailed information you need.



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Product Name: Single Row Deep Groove Bearings
Quality: High
Simples: Available
Precision: P6, P5, P4, P2, P0
Noise: Z1, Z2, Z3, Z4
Seals Type: Open, Zz, 2RS
US$ 2/Piece
1 Piece(Min.Order)

Request Sample



Customized Request

ball bearing

What are the Challenges Associated with Noise Reduction in Ball Bearings?

Noise reduction in ball bearings is a crucial consideration, especially in applications where noise levels must be minimized for operational efficiency and user comfort. While ball bearings are designed to operate smoothly, there are several challenges associated with reducing noise in their operation:

  • Vibration:

Vibration generated by the movement of rolling elements and raceways can lead to noise. Even minor irregularities in bearing components or the mounting system can cause vibration that translates into audible noise.

  • Bearing Type and Design:

The type and design of the ball bearing can impact noise generation. For example, deep groove ball bearings are known for their quiet operation, while angular contact bearings can generate more noise due to their higher contact angles.

  • Lubrication:

Improper or inadequate lubrication can result in increased friction and wear, leading to noise. Choosing the right lubricant and maintaining proper lubrication levels are essential for reducing noise in ball bearings.

  • Bearing Clearance and Preload:

Incorrect clearance or preload settings can lead to noise issues. Excessive clearance or inadequate preload can cause the rolling elements to impact the raceways, resulting in noise during rotation.

  • Material and Manufacturing Quality:

The quality of materials and manufacturing processes can affect noise levels. Inconsistent or low-quality materials, improper heat treatment, or manufacturing defects can lead to noise generation during operation.

  • Surface Finish:

The surface finish of the rolling elements and raceways can impact noise. Rough surfaces can generate more noise due to increased friction and potential irregularities.

  • Sealing and Shielding:

Seals and shields that protect bearings can influence noise levels. While they are necessary for contamination prevention, they can also cause additional friction and generate noise.

  • Operating Conditions:

External factors such as temperature, speed, and load can influence noise levels. High speeds or heavy loads can amplify noise due to increased stress on the bearing components.

  • Wear and Deterioration:

As ball bearings wear over time, noise levels can increase. Worn components or inadequate lubrication can lead to more significant noise issues as the bearing operates.

To address these challenges and reduce noise in ball bearings, manufacturers and engineers employ various techniques, such as optimizing design, selecting suitable bearing types, using proper lubrication, maintaining accurate preload settings, and ensuring high-quality materials and manufacturing processes. Noise reduction efforts are essential to improve overall product quality, meet noise regulations, and enhance user experience in various applications.

ball bearing

Are there any Industry Standards or Certifications that Ball Bearings should Meet?

Yes, there are several industry standards and certifications that ball bearings should meet to ensure their quality, performance, and reliability. These standards help manufacturers, engineers, and customers assess the suitability of bearings for specific applications. Some of the key standards and certifications for ball bearings include:

  • ISO Standards:

The International Organization for Standardization (ISO) has developed a series of standards related to ball bearings. ISO 15 defines dimensions, boundary dimensions, and tolerances for radial bearings. ISO 281 specifies dynamic load ratings and calculation methods for bearings’ life calculations.

  • ABEC (Annular Bearing Engineering Committee) Ratings:

ABEC ratings are commonly used in North America to indicate the precision and performance of ball bearings. Ratings range from ABEC 1 (lowest precision) to ABEC 9 (highest precision). However, it’s important to note that ABEC ratings focus primarily on dimensional tolerances and do not encompass all aspects of bearing quality.

  • DIN Standards:

The German Institute for Standardization (Deutsches Institut für Normung, DIN) has published various standards related to ball bearings. DIN 625 covers dimensions for deep groove ball bearings, while DIN 616 provides guidelines for precision angular contact ball bearings.

  • JIS (Japanese Industrial Standards):

JIS standards are used in Japan and internationally to define the characteristics and dimensions of various products, including ball bearings. JIS B 1512 outlines the classification and dimensions of rolling bearings.

  • ASTM (American Society for Testing and Materials) Standards:

ASTM has standards that cover various aspects of bearing testing, performance, and materials. ASTM F2215, for instance, specifies the requirements for ball bearings used in surgical implants.

  • CE Marking:

CE marking indicates that a product complies with European Union health, safety, and environmental requirements. It may be required for bearings used in machinery intended to be sold within the EU market.

  • Industry-Specific Standards:

Various industries, such as aerospace, automotive, medical, and nuclear, have specific standards or certifications that bearings must meet to ensure safety, reliability, and compliance with industry-specific requirements.

  • Quality Management Systems:

Manufacturers that adhere to quality management systems, such as ISO 9001, demonstrate their commitment to consistent product quality and customer satisfaction. Certification to these systems indicates that the manufacturing process follows established protocols and best practices.

When selecting ball bearings, it’s important to consider the relevant standards and certifications that align with the application’s requirements. This ensures that the bearings meet recognized quality and performance criteria, ultimately contributing to reliable and efficient operation.

ball bearing

What are the Different Components that Make up a Typical Ball Bearing?

A typical ball bearing consists of several essential components that work together to reduce friction and support loads. Here are the main components that make up a ball bearing:

  • Outer Ring:

The outer ring is the stationary part of the bearing that provides support and houses the other components. It contains raceways (grooves) that guide the balls’ movement.

  • Inner Ring:

The inner ring is the rotating part of the bearing that attaches to the shaft. It also contains raceways that correspond to those on the outer ring, allowing the balls to roll smoothly.

  • Balls:

The spherical balls are the rolling elements that reduce friction between the inner and outer rings. Their smooth rolling motion enables efficient movement and load distribution.

  • Cage or Retainer:

The cage, also known as the retainer, maintains a consistent spacing between the balls. It prevents the balls from touching each other, reducing friction and preventing jamming.

  • Seals and Shields:

Many ball bearings include seals or shields to protect the internal components from contaminants and retain lubrication. Seals provide better protection against contaminants, while shields offer less resistance to rotation.

  • Lubricant:

Lubrication is essential to reduce friction, wear, and heat generation. Bearings are typically filled with lubricants that ensure smooth movement between the balls and raceways.

  • Flanges and Snap Rings:

In some designs, flanges or snap rings are added to help position and secure the bearing in its housing or on the shaft. Flanges prevent axial movement, while snap rings secure the bearing radially.

  • Raceways:

Raceways are the grooved tracks on the inner and outer rings where the balls roll. The shape and design of the raceways influence the bearing’s load-carrying capacity and performance.

  • Anti-Friction Shield:

In certain high-speed applications, a thin anti-friction shield can be placed between the inner and outer rings to minimize friction and heat generation.

These components work together to enable the smooth rolling motion, load support, and reduced friction that characterize ball bearings. The proper design and assembly of these components ensure the bearing’s optimal performance and longevity in various applications.

China Custom CZPT CZPT CZPT CZPT CZPT Double Row Deep Groove Ball Bearing   wholesalerChina Custom CZPT CZPT CZPT CZPT CZPT Double Row Deep Groove Ball Bearing   wholesaler
editor by CX 2024-05-14

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