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Table of Contents
Miniature bearings (also known as small bearings) are essential components in various industries, providing precision motion and reducing friction in compact applications. This chart includes essential information and specifications , enabling users to select the perfect miniature ball bearing for their specific requirements.
Before diving into the chart, it's essential to grasp the basics of miniature ball bearings. These precision-engineered bearings are smaller in size compared to standard ball bearings, with outer diameters ranging from 1mm to 30mm. They comprise an outer ring, inner ring, ball set, and cage, designed to deliver smooth, low-friction motion.
Product page: Miniature Bearings - Bore(d)<10mm 
| Bearing No. | Bore(d) (mm) | Outer(D) (mm) | Width(B) (mm) | Weight (g) | D1 | C1 | C2 |
|---|---|---|---|---|---|---|---|
| 604 | 4 | 12 | 4 | 2.19 | 13.5 | 1 | 1 |
| 624 | 4 | 13 | 5 | 3.1 | 15 | 1 | 1 |
| 634 | 4 | 16 | 5 | 5.24 | 18 | 1 | 1 |
| 674 | 4 | 7 | 2 | 0.23 | 8.2 | 0.6 | 0.6 |
| 684 | 4 | 9 | 2.3 | 0.65 | 10.3 | 0.6 | 0.6 |
| 694 | 4 | 11 | 4 | 1.69 | 12.5 | 1 | 1 |
| 605 | 5 | 14 | 5 | 3.46 | 16 | 1 | 1 |
| 625 | 5 | 16 | 5 | 4.95 | 18 | 1 | 1 |
| 635 | 5 | 19 | 6 | 8.5 | 22 | 1.5 | 1.5 |
| 675 | 5 | 8 | 2 | 0.25 | 9.2 | 0.6 | 0.6 |
| 685 | 5 | 11 | 3 | 1.16 | 12.5 | 0.8 | 1 |
| 695 | 5 | 13 | 4 | 2.39 | 15 | 1 | 1 |
| 606 | 6 | 17 | 6 | 5.94 | 19 | 1.2 | 1.2 |
| 626 | 6 | 19 | 6 | 8.12 | 22 | 1.5 | 1.5 |
| 636 | 6 | 22 | 7 | 13.9 | |||
| 676 | 6 | 10 | 2.5 | 0.55 | 11.2 | 0.6 | 0.6 |
| 686 | 6 | 13 | 3.5 | 1.87 | 15 | 1 | 1.1 |
| 696 | 6 | 15 | 5 | 3.85 | 17 | 1.2 | 1.2 |
| 607 | 7 | 19 | 6 | 7.8 | |||
| 627 | 7 | 22 | 7 | 12.7 | 25 | 1.5 | 1.5 |
| 637 | 7 | 26 | 9 | 24.2 | |||
| 677 | 7 | 11 | 2.5 | 0.59 | 12.2 | 0.6 | 0.6 |
| 687 | 7 | 14 | 3.5 | 2.03 | 16 | 1 | 1.1 |
| 697 | 7 | 17 | 5 | 5.26 | |||
| 608 | 8 | 22 | 7 | 11.8 | 25 | 1.5 | 1.5 |
| 628 | 8 | 24 | 8 | 17.1 | |||
| 638 | 8 | 28 | 9 | 28.1 | |||
| 678 | 8 | 12 | 2.5 | 0.7 | 13.2 | 0.6 | |
| 688 | 8 | 16 | 4 | 3.11 | 18 | 1 | |
| 698 | 8 | 19 | 6 | 7.12 | 22 | 1.5 | 1.5 |
The chart provides a comprehensive list of small bearing sizes, including their outer diameter (OD), inner diameter (ID), and width (W). Understanding these dimensions is crucial for finding the perfect fit in your application, ensuring optimal performance and space-saving integration.
Miniature Ball Bearings Size Chart
When it comes to miniature ball bearings, selecting the right material is paramount for achieving optimal performance and longevity. In this section, we explore the three most common materials used in miniature ball bearings: stainless steel, steel, and ceramic.
While they may not have the same level of corrosion resistance as stainless steel bearings, they are cost-effective and suitable for applications that do not involve exposure to corrosive elements.
These bearings are crafted from high-quality stainless steel alloys, known for their outstanding corrosion resistance, even in harsh and corrosive environments. As a result, stainless steel miniature ball bearings are well-suited for applications exposed to moisture, chemicals, and varying temperatures.
Ceramic balls exhibit exceptional hardness, lightweight characteristics, and low thermal expansion, making them ideal for high-speed and high-temperature environments. These bearings reduce rotational inertia, resulting in reduced friction and increased efficiency, making them sought after in aerospace, precision instruments, and advanced robotics.
In addition to materials, the outer cover of miniature ball bearings plays a crucial role in determining their performance and suitability for specific applications. In this section, we delve into the various types of seals and shields available for miniature ball bearings, and how they protect the bearings from contaminants and contribute to their overall functionality.
OPEN type bearing cover is a design without a cover, allowing the internal components of the bearing to be exposed to the external environment. This design makes the bearing more susceptible to contamination from dirt, dust, and other external particles.
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ZZ refers to the bearing with metal shields as the outer cover. The metal shields effectively block dust, contaminants, and other external particles from entering while retaining the lubricant within the bearing.
Miniature ball bearings, with their precision motion and compact design, are indispensable components that find widespread use across a diverse range of industries. These small wonders deliver exceptional performance, contributing to the efficiency and reliability of various systems. Let's explore the plethora of applications where miniature ball bearings make a significant impact, revolutionizing modern engineering and technology.
Miniature ball bearings low-friction properties enable smooth and accurate motion in robotic arms, grippers, and precision positioning systems. This precision and compactness result in enhanced responsiveness and improved overall performance of robotic applications. Moreover, miniature ball bearings find their way into the aerospace and aviation industries, where lightweight, high-performance components are a necessity.
In the medical field, where precision and reliability are paramount, miniature ball bearings are essential components in dental handpieces, surgical tools, and diagnostic equipment. These bearings ensure smooth operation and low noise levels, facilitating accurate and efficient medical procedures. Additionally, enthusiasts in the RC (Radio Control) hobby and miniature modeling communities benefit from the compact size and efficiency of these bearings in their remote-controlled cars, planes, drones, and model trains.
Extended reading:
Needle Bearing Size Chart｜Teach you how to choose bearings correctly
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