Product Description

Company Profile

STMPB INDUSTRY was established in 2571; We have 2 bearing brand which STMPB INDUSTRY and YUPO were founded in 2571.STMPB INDUSTRY is our international brand which mainly faces overseas market.YUPO is the domestic brand which manily faces China market.

STMPB INDUSTRY bearing headquarters is mainly located in HangZhou, ZheJiang Province, and the main production base is located in HangZhou, ZheJiang Province. The main products of STMPB INDUSTRY bearings are high precision bearings and customized bearings. The main products of STMPB INDUSTRY are precision angular contact ball bearings, ball screw bearings and bearing units, thin-wall equal-section bearings, precision cylindrical roller bearings, YRT bearings, precision cross roller bearings, precision slewing bearings and non-standard customized products.

STMPB INDUSTRY bearing R & D team mainly composed of professors and doctors, the R & D strength is very strong, to provide customers with the best quality production solutions and solutions. STMPB INDUSTRY bearing with precision production equipment, can provide customers with stable P4,P3,P2 grade products.

STMPB INDUSTRY bearings are mainly applied in CNC machine tools, robots, medical machinery, precision instruments, petrochemical and other fields. So far, STMPB INDUSTRY bearings customers throughout South America, Southeast Asia, the Middle East, Europe and other regions, by the world’s customers consistently high praise.


Product Parameters



Boundary dimensions Load rating Weight
d D d2 D2 Cr Cor
in. mm in. mm in. mm in. mm KN kg
CSI57131 2 50.8 2.625 66.675 2.231 56.67 2.393 60.78 6.4 4.1 0.07
CSI57131 2.5 63.5 3.125 79.375 2.731 69.37 2.893 73.48 6.9 5.1 0.09
CSI03031 3 76.2 3.625 92.075 3.231 82.07 3.393 86.18 7.3 6.0 0.11
CSI5711 3.5 88.9 4.125 104.775 3.731 94.77 3.893 98.88 7.7 6.8 0.12
CSI04031 4 101.6 4.625 117.475 4.231 107.47 4.393 111.58 8.1 7.8 0.14
CSI04231 4.25 107.95 4.875 123.825 4.481 113.82 4.643 117.93 8.2 8.1 0.14
CSI 0571 1 4.5 114.3 5.125 130.175 4.731 120.17 4.893 124.28 8.5 8.7 0.15
CSI5711 4.75 120.65 5.375 136.525 4.981 126.52 5.143 130.63 8.6 9.0 0.15
CSI05031 5 127 5.625 142.875 5.231 132.87 5.393 136.98 8.8 9.6 0.17
CSI5711 5.5 139.7 6.125 155.575 5.731 145.57 5.893 149.68 9.1 10.5 0.19
CSI06031 6 152.4 6.625 168.275 6.231 158.27 6.393 162.38 9.4 11.4 0.20
CSI06531 6.5 165.1 7.125 180.975 6.731 170.97 6.893 175.08 9.6 12.3 0.21
CSI07031 7 177.8 7.625 193.675 7.231 183.67 7.393 187.78 9.9 13.2 0.23
CSI5711 7.5 190.5 8.125 206.375 7.731 196.37 7.893 200.48 10.1 14.1 0.24
CSI08031 8 203.2 8.625 219.075 8.231 209.07 8.393 213.18 10.4 15.0 0.26
CSI 0571 1 9 228.6 9.625 244.475 9.231 234.47 9.393 238.58 10.8 16.8 0.30
CSI10031 10 254 10.625 269.875 10.231 259.87 10.393 263.98 11.2 18.6 0.33
CSI11031 11 279.4 11.625 295.275 11.231 285.27 11.393 289.38 11.6 20.4 0.34
CSI12031 12 304.8 12.625 320.675 12.231 310.67 12.393 314.78 12.0 22.2 0.38
CSI14031 14 355.6 14.625 371.475 14.231 361.47 14.393 365.58 12.7 25.8 0.48
CSI16031 16 406.4 16.625 422.275 16.231 412.27 16.393 416.38 13.3 29.4 0.54
CSI18031 18 457.2 18.625 473.075 18.231 463.07 18.393 467.18 13.9 33.1 0.61
CSI20031 20 508 20.625 523.875 20.231 513.87 20.393 517.98 14.4 36.7 0.68

Detailed Photos


Installation Instructions

(1)Inspection of components before installation

Clean the bearing housing or other mounting parts, remove the dirt, and confirm whether the burrs of each

part have been removed.

(2) Install it on the bearing seat or shaft

Because it is a thin-walled bearing, it is easy to tilt during installation. Please use a plastic hammer to find the

level and tap it evenly in the circumferential direction, and install it little by little.

Until you can confirm the contact surface is fully seated by sound.

(3) Installation method of side compression flange

1.  After placing the side compression flange in position,

place it in the circumferential direction.

Shake back a few times to adjust the position of the

mounting bolts.

2.  Install the compression bolt, and make sure that

there is no deviation due to the bolt hole when tightening the

bolt by hand.

The distance causes the bolts to be difficult to screw in.

3.  The tightening of the compression bolt can be

divided into 3-4 parts from temporary tightening to final

tightening  stage, repeat the tightening in the order on the

diagonal. When tightening is divided into 2 parts

When tightening the inner or outer ring press bolts, the

integral outer ring is often tightened during the tightening


Or the inner ring can be adjusted and rotated a little to make the outer ring divided into 2 parts or the

deviation of the inner ring is corrected.

Special design: If you need special structure (such as outer ring with mounting holes, inner ring without

holes, etc.), non-standard size, special materials or high precision requirements, etc., please contact.




Technological Support

28 professional mechanical engineers
16 professional bearing analysis engineers
326 professional workers
83 sets of high precision CNC machine tools
32 sets of bearing testing equipment
13,000 square meters factory


After Sales Service

In the sales process, we will have professional sales personnel to answer customers’ questions in time, update the production progress, sort out the photos and videos of packaging and delivery, provide customers with the required documents; We will also invite customers to visit our factory, and we will strive to provide solutions for customers’ needs.

It is not the end after delivery, but a new beginning. We will update the logistics status and arrival date to customers in time.Ask customers for feedback on product quality, packaging, etc. at the first time, so as to improve the next cooperation. We will do our best to deal with any customer’s problems with the product.

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Inner Diameter: 63.5mm
Outer Diameter: 79.375mm
Inner Diameter 2: 69.37mm
Outer Diameter 2: 73.48mm
Cr: 6.9kn
Cor: 5.1kn
US$ 20/Piece
1 Piece(Min.Order)

Request Sample



Customized Request

ball bearing

Are there Specific Maintenance Practices to Ensure the Longevity of Ball Bearings?

Maintaining ball bearings is essential to ensure their longevity, reliable performance, and prevent premature failure. Proper maintenance practices can extend the lifespan of ball bearings and the equipment they are used in. Here are specific maintenance practices to consider:

  • Regular Lubrication:

Implement a regular lubrication schedule using the appropriate lubricant for the application. Lubrication reduces friction, prevents wear, and helps dissipate heat. Follow manufacturer guidelines for lubricant type, quantity, and frequency.

  • Clean Environment:

Keep the operating environment clean and free from contaminants. Dust, dirt, and debris can infiltrate bearings and cause damage. Use seals or shields to protect bearings from contaminants, especially in harsh environments.

  • Proper Installation:

Ensure correct installation of bearings using proper tools and techniques. Improper installation can lead to misalignment, uneven load distribution, and premature wear. Follow manufacturer recommendations for installation procedures.

  • Regular Inspections:

Perform routine visual inspections to check for signs of wear, damage, or contamination. Regular inspections can help identify issues early and prevent further damage. Pay attention to noise, vibration, and temperature changes.

  • Temperature Monitoring:

Monitor bearing temperatures during operation using infrared thermometers or sensors. Abnormal temperature increases can indicate inadequate lubrication, misalignment, or other problems.

  • Correct Handling:

Handle bearings with care to prevent damage during storage, transportation, and installation. Avoid dropping or subjecting them to impacts that can affect their internal components.

  • Bearing Removal and Replacement:

Follow proper procedures when removing and replacing bearings. Use appropriate tools and techniques to avoid damage to the bearing or the surrounding components.

  • Alignment Maintenance:

Maintain proper shaft and housing alignment to prevent excessive loads and wear on the bearing. Misalignment can lead to increased stress and premature failure.

  • Training and Education:

Provide training to operators and maintenance personnel on proper bearing maintenance and handling practices. Educated personnel are more likely to identify issues and perform maintenance correctly.

  • Documented Records:

Keep records of maintenance activities, inspections, lubrication schedules, and any issues encountered. This documentation helps track the bearing’s performance over time and informs future maintenance decisions.

By implementing these maintenance practices, you can ensure the longevity of ball bearings, minimize downtime, reduce operational costs, and maintain the reliability of the equipment they are a part of.

ball bearing

How do Miniature Ball Bearings Differ from Standard-sized Ones, and Where are They Commonly Used?

Miniature ball bearings, as the name suggests, are smaller in size compared to standard-sized ball bearings. They have distinct characteristics and are designed to meet the unique requirements of applications that demand compactness, precision, and efficient rotation in confined spaces. Here’s how miniature ball bearings differ from standard-sized ones and where they are commonly used:

  • Size:

The most noticeable difference is their size. Miniature ball bearings typically have outer diameters ranging from a few millimeters to around 30 millimeters, while standard-sized ball bearings have larger dimensions suitable for heavier loads and higher speeds.

  • Load Capacity:

Due to their smaller size, miniature ball bearings have lower load-carrying capacities compared to standard-sized bearings. They are designed for light to moderate loads and are often used in applications where precision and compactness are prioritized over heavy load support.

  • Precision:

Miniature ball bearings are known for their high precision and accuracy. They are manufactured to tighter tolerances, making them suitable for applications requiring precise motion control and low levels of vibration.

  • Speed:

Miniature ball bearings can achieve higher speeds than standard-sized bearings due to their smaller size and lower mass. This makes them ideal for applications involving high-speed rotation.

  • Friction and Efficiency:

Miniature ball bearings generally have lower friction due to their smaller contact area. This contributes to higher efficiency and reduced heat generation in applications that require smooth and efficient motion.

  • Applications:

Miniature ball bearings find applications in various industries and sectors:

  • Electronics and Consumer Devices:

They are used in small motors, computer disk drives, printers, and miniature fans, where space is limited but precise motion is essential.

  • Medical and Dental Equipment:

Miniature bearings are used in medical devices such as surgical instruments, dental handpieces, and diagnostic equipment due to their precision and compactness.

  • Robotics and Automation:

Miniature ball bearings are integral to robotic arms, miniature conveyors, and automation systems, enabling precise movement in confined spaces.

  • Aerospace and Defense:

They are used in applications like UAVs (drones), aerospace actuators, and satellite components where size and weight constraints are critical.

  • Optics and Instrumentation:

Miniature bearings play a role in optical instruments, cameras, and measuring devices, providing smooth rotation and accurate positioning.

Overall, miniature ball bearings are specialized components designed for applications where space, precision, and efficient rotation are paramount. Their compactness and high precision make them crucial in various industries requiring reliable motion control in limited spaces.

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 Professional Wholesale Thin Section Deep Groove Ball Bearing Csi02531   wholesalerChina Professional Wholesale Thin Section Deep Groove Ball Bearing Csi02531   wholesaler
editor by CX 2024-04-03