Product Description






  shape Dimension Ball Complement
Type Bore Diameter (d) Outer Diameter (D) Width for open type(B) Width for shield type(B1) Radius rs(min) size Qty
  mm mm mm mm mm mm 6
R1-4zz 1.984 6.350 2.380 3.571 0.10 1.000 7
R133zz 2.380 4.762 1.588 2.380 0.10 0.800 7
R1-5zz 2.380 7.938 2.779 3.571 0.15 1.588 6
R144Jzzs 3.175 6.350 2.380 2.779 0.10 1.000 8
R2-5zz 3.175 7.938 2.779 3.571 0.10 1.588 6
R2-6zz 3.175 9.525 2.779 3.571 0.15 1.588 7
R2zz 3.175 9.525 3.967 3.967 0.30 1.588 7
R2Azz 3.175 12.700 4.366 4.366 0.30 1.588 7
R155zzs 3.967 7.938 2.779 3.175 0.10 1.000 10
R156zzs 4.762 7.938 2.779 3.175 0.10 1.000 10
R166zzs 4.762 9.525 3.175 3.175 0.10 1.588 8
R3zz 4.762 12.700 3.967 4.978 0.30 2.381 7
R3Azz 4.762 15.875 4.978 4.978 0.30 2.381 8
R168zzs 6.350 9.525 3.175 3.175 0.10 1.000 11
R188zz 6.350 12.700 3.175 4.762 0.15 2.000 8
R4zz 6.350 15.875 4.978 4.978 0.30 2.381 8
R4Azz 6.350 19.050 5.558 7.142 0.40 3.500 6
R1810zzs 7.938 12.700 3.967 3.967 0.15 1.200 12
R6zz 9.525 22.225 5.558 7.142 0.40 3.969 7
R1038zz 9.525 15.875 3.967 3.967 0.15    
R1212zz 12.700 19.050 3.967 3.967      




Type Bore Diameter (d) Outer Diameter (D) Flange Width Flange Width(c)
Outer Diameter (b)
(D1) open zz open zz
FR1-4zzs 1.984 6.35 7.518 2.38 3.571 0.584 0.787
FR133zz 2.38 4.762 5.944 1.588 2.38 0.457 0.787
FR1-5zzs 7.938 9.119 2.779 3.571 0.584 0.787
FR144zzs 6.35 7.518 2.38 2.779 0.584 0.787
FR2-5zz 3.175 7.938 9.119 2.779 3.571 0.584 0.787
FR2-6zzs 9.525 10.719 2.779 3.571 0.584 0.787
FR2zz 9.525 11.176 3.967 3.967 0.762 0.762
FE155zzs 3.967 7.938 9.119 2.779 3.175 0.584 0.914
FR156zzs 4.762 7.938 9.119 2.779 3.175 0.584 0.914
FR166zz 9.525 10.719 3.175 3.175 0.584 0.787
FR3zz 12.7 14.351 4.978 4.978 1.067 1.067
FR168zzs 6.35 9.525 10.719 3.175 3.175 0.584 0.914
FR188zz 12.7 13.894 3.175 4.762 0.584 1.143
FR4zz 15.875 17.526 4.978 4.978 1.067 1.067
FR1810zzs 7.938 12.7 13.894 3.967 3.967 0.787 0.787
FR6zz 9.525 22.225 24.613 5.558 7.142 1.57 1.57




   Established in 2007, HangZhou Runstar Bearings Manufacturing Co.,Ltd is a professional manufacturer of thrust ball bearing and miniature ball bearing in HangZhou,China.  With a inner diameter from 2mm to 15mm for metric series and from 0.0781″ to 0.375″ for inch series , the material can be selected with chrome steel(Gcr15) or stainless steel(9Cr18) at your request, our characteristic products are thrust ball bearing with or without groove, miniature ball bearing,flange bearing and  stainless steel bearing,as well as non-standard bearings, we have more than 12 year’s experience in supplying thrust ball bearing and miniature ball bearing for industries.















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Precision Rating: ABEC-1,ABEC-3,ABEC-5
Cage: Steel Cage
Certificate: ISO9001:2015,Reach and RoHS
US$ 2/Set
1 Set(Min.Order)


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steel ball bearing

What is the role of cage design and materials in steel ball bearing performance and durability?

The cage design and materials used in steel ball bearings play a crucial role in determining their performance and durability. The cage, also known as the bearing retainer or separator, holds the steel balls in position and maintains the proper spacing between them. It prevents the balls from coming into contact with each other, which could lead to excessive friction, wear, and damage. Here’s an explanation of the role of cage design and materials in steel ball bearing performance and durability:

1. Ball Guidance and Positioning:

The primary function of the cage is to guide and position the steel balls within the bearing. The cage ensures that the balls are evenly distributed around the bearing raceways, maintaining proper alignment and preventing contact between adjacent balls. This guidance and positioning function is crucial for achieving smooth and efficient rolling motion, reducing friction, and optimizing the performance of the bearing.

2. Friction and Heat Reduction:

The cage design and materials can significantly impact the friction and heat generated during bearing operation. An efficient cage design allows for proper ball rotation while minimizing contact and sliding friction between the balls and the cage itself. This reduced friction helps to minimize energy loss and heat generation, improving the overall efficiency and durability of the bearing. Additionally, some cage materials have low thermal conductivity, which can further contribute to heat reduction and prevent overheating of the bearing.

3. Load Distribution:

The cage also plays a role in distributing the applied loads evenly among the steel balls. By maintaining the correct spacing between the balls, the cage helps to distribute the radial and axial loads across a larger contact area. This load distribution capability prevents localized stresses and reduces the risk of premature wear or failure of the bearing. A well-designed cage ensures that the bearing can handle higher loads and provides improved durability under demanding operating conditions.

4. Lubricant Retention:

The cage design can impact the retention and distribution of lubricant within the bearing. Proper lubrication is essential for reducing friction, preventing wear, and protecting against corrosion. The cage should allow for sufficient lubricant flow and retention, ensuring that the balls and raceways are adequately lubricated during operation. An effective cage design promotes the proper distribution and retention of lubricant, enhancing the overall performance and durability of the bearing.

5. Material Compatibility and Durability:

The choice of cage materials is critical for the durability and performance of steel ball bearings. The cage materials must be compatible with the bearing operating conditions, including factors such as speed, temperature, and exposure to corrosive environments. Common cage materials include steel, brass, bronze, synthetic resins, and polymers. Each material has its own advantages and limitations in terms of strength, wear resistance, corrosion resistance, and temperature resistance. The selection of the appropriate cage material ensures the long-term durability and reliable operation of the bearing under specific application requirements.

6. Noise and Vibration Control:

The cage design can also influence the level of noise and vibration generated by the bearing during operation. A well-designed cage can help reduce noise and vibration by maintaining ball stability, minimizing ball-to-cage and ball-to-raceway contact, and dampening oscillations. This noise and vibration control not only improves user comfort but also reduces the risk of damage to other components in the machinery or equipment.

7. Application-Specific Considerations:

In some cases, the cage design and materials may need to be tailored to specific application requirements. For example, in high-speed applications, cages with low mass and low centrifugal forces may be preferred to minimize the risk of cage deformation or imbalance. In environments with exposure to chemicals or extreme temperatures, cage materials with excellent chemical resistance or high-temperature stability may be necessary. Application-specific considerations ensure that the cage design and materials are optimized for the specific operating conditions, further enhancing bearing performance and durability.

In summary, the cage design and materials used in steel ball bearings play a vital role in their performance and durability. The cage provides ball guidance, reduces friction and heat, distributes loads, retains lubricant, and controls noise and vibration. The choice of cage materials must consider factors such as compatibility, durability, and application-specific requirements to ensure optimal bearing performance and long-term reliability.

steel ball bearing

What are the potential challenges or limitations associated with using steel ball bearings in specific industries?

While steel ball bearings offer numerous advantages, there are also certain challenges and limitations associated with their use in specific industries. Let’s explore some of these potential challenges:

1. Corrosion:

Steel ball bearings are susceptible to corrosion, especially when exposed to moisture, harsh chemicals, or corrosive environments. Corrosion can lead to pitting, surface damage, and premature failure of the bearings. In industries such as marine, offshore, or chemical processing, where exposure to corrosive elements is common, alternative bearing materials or protective coatings may be required to mitigate the effects of corrosion.

2. High-Temperature Applications:

Extreme temperatures can pose challenges for steel ball bearings. At high temperatures, the lubricants may degrade, resulting in inadequate lubrication and increased friction. The heat generated during operation can also cause thermal expansion, leading to improper clearances or interference fits. In industries such as aerospace, automotive, or industrial ovens, where high temperatures are prevalent, specialized high-temperature bearing materials and lubricants may be necessary to ensure reliable performance.

3. Contamination and Cleanliness:

Contamination by dust, dirt, or particles can affect the performance and lifespan of steel ball bearings. Industries such as mining, construction, or agriculture often expose bearings to harsh and dusty environments, increasing the risk of contamination. Regular maintenance, proper sealing methods, and implementing effective contamination control measures are essential to minimize the adverse effects of contamination on the bearings.

4. Axial and Radial Loads:

Steel ball bearings have specific load capacity limits, both axially and radially. Exceeding these limits can result in increased stress, deformation, or premature failure. In industries where heavy loads are encountered, such as heavy machinery, construction equipment, or wind turbines, it is crucial to select bearings with appropriate load ratings and consider factors such as load distribution, shaft deflection, and operating conditions to ensure reliable performance.

5. Vibration and Noise:

Steel ball bearings can generate vibration and noise, particularly at high speeds or in applications with unbalanced loads. Excessive vibration and noise can impact the overall system performance and cause discomfort or safety concerns. In industries such as precision machining, robotics, or medical equipment, where low vibration and noise levels are crucial, additional measures such as vibration dampening, precision balancing, or alternative bearing designs may be necessary.

6. Speed Limitations:

Although steel ball bearings are designed to operate at high speeds, there are limitations imposed by factors such as ball size, cage design, lubrication, and centrifugal forces. Exceeding the recommended speed limits can lead to increased heat generation, ball skidding, or cage failure. In industries such as aerospace, automotive racing, or high-speed machinery, specialized high-speed bearing designs or alternative bearing technologies, such as ceramic bearings, may be utilized to achieve the desired performance at extreme speeds.

7. Specialized Environments:

Some industries present unique challenges that may require specialized bearing solutions beyond the capabilities of steel ball bearings. For example, industries involving cryogenic temperatures, vacuum environments, or ultrahigh precision applications may necessitate alternative bearing materials, lubricants, or designs to ensure optimal performance and reliability.

By understanding and addressing these potential challenges and limitations, industries can make informed decisions regarding the selection, application, and maintenance of steel ball bearings or explore alternative bearing options that better suit their specific requirements.

steel ball bearing

How do steel ball bearings compare to other types of bearings, like roller bearings?

Steel ball bearings and roller bearings are two common types of bearings used in various applications. While they serve similar purposes of reducing friction and facilitating smooth motion, there are distinct differences between them. Let’s compare steel ball bearings to roller bearings:

1. Design: Steel ball bearings consist of small spherical balls that roll between the inner and outer raceways. Roller bearings, on the other hand, use cylindrical rollers that distribute the load over a larger contact area. The design of roller bearings allows them to handle higher loads compared to ball bearings.

2. Load Capacity: Roller bearings generally have a higher load-carrying capacity than ball bearings. The larger contact area of the rollers allows them to distribute the load more effectively, making roller bearings suitable for heavy-duty applications that require higher radial forces.

3. Friction and Speed: Steel ball bearings have lower frictional resistance compared to roller bearings. The point contact between the balls and the raceways results in reduced friction, making ball bearings well-suited for high-speed applications. Roller bearings, although having slightly higher friction, are better suited for applications that require higher radial forces and moderate speed.

4. Stiffness: Roller bearings exhibit higher stiffness compared to ball bearings. The larger contact area of the rollers provides greater support and resistance to deformation under heavy loads. This characteristic makes roller bearings more suitable for applications where rigidity and stability are crucial.

5. Application: The choice between steel ball bearings and roller bearings depends on the specific application requirements. Steel ball bearings are commonly used in applications that require high-speed rotation, such as electric motors, automotive components, and household appliances. Roller bearings find extensive use in heavy machinery, industrial gearboxes, construction equipment, and automotive applications where higher loads and radial forces are involved.

6. Size and Configurations: Steel ball bearings are available in a wide range of sizes and configurations, allowing for versatility in different applications. Roller bearings also come in various sizes and types, including cylindrical, tapered, and spherical roller bearings, catering to specific load and performance requirements.

7. Cost: Steel ball bearings are generally more cost-effective compared to roller bearings. The simpler design and manufacturing process of ball bearings contribute to their lower cost, making them a preferred choice in many applications where high load capacity is not a primary requirement.

In summary, steel ball bearings and roller bearings have different designs, load capacities, friction characteristics, stiffness, applications, and cost considerations. The choice between the two depends on factors such as load requirements, speed, rigidity, and the specific needs of the application in question.

China Best Sales Inch Stainless Steel Miniature Ball Bearing Sr1-4zz Sr1-5zz Sr133zz Sr144zz Sr155zz Sr156zz Sr166zz Sr168zz Sr2zz Sr3zz Sr4zz Sr6zz Sr8zz Sr1810zz Mini Bearing   drive shaft bearingChina Best Sales Inch Stainless Steel Miniature Ball Bearing Sr1-4zz Sr1-5zz Sr133zz Sr144zz Sr155zz Sr156zz Sr166zz Sr168zz Sr2zz Sr3zz Sr4zz Sr6zz Sr8zz Sr1810zz Mini Bearing   drive shaft bearing
editor by CX 2024-04-24

Steel Ball Bearings

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