What is pillow block ball bearing?
Pillow block ball bearing is a common mechanical part, which is widely used in various industrial fields. It has the advantages of strong bearing capacity, good impact resistance, and stable operation, so it plays a vital role in mechanical equipment. Different quality grades, materials, and models all affect the use effect.
One of the main features of the pillow block ball bearing is its simple structure, which consists of an inner ring, an outer ring, steel balls, and a cage. This structure makes the pillow block bearing have a large radial load capacity, and can also bear a certain axial load. This enables the pillow block ball bearing to operate normally under various complex working conditions, ensuring the stability and reliability of mechanical equipment.
1. The quality grade of the pillow block ball bearing
The quality grade of the pillow block ball bearing is divided according to its accuracy and performance index. Common quality grades are P0, P6, P5, P4, P2, etc.
| Quality grade | Remark | Application |
| P0 | Refers to the ordinary precision grade, the manufacturing precision is low. | It is suitable for use under general working conditions, such as household appliances, low-speed transmissions, etc. |
| P6 | Refers to a higher precision grade, the manufacturing precision is higher. | Which can meet the requirements of general industrial equipment, such as metallurgical equipment, mining machinery, agricultural machinery, etc. |
| P5 | Refers to the high-precision grade, the manufacturing precision is higher. | It is suitable for equipment with high-speed and high-precision requirements, such as machine tools, CNC machine tools, textile equipment, etc. |
| P4 | Refers to the extremely high-precision grade, the manufacturing precision is very high. | It is suitable for equipment that requires ultra-high speed and ultra-high precision, such as precision instruments. |
| P2 | Refers to the ultra-high precision level, the manufacturing accuracy reaches the limit. | It is suitable for special equipment requiring ultra-high speed and ultra-high precision, such as aerospace equipment, precision measuring equipment, etc. |
Different quality grades of pillow block ball bearings are different in the manufacturing process, material selection, and precision requirements, so they are also affected by other factors under different working conditions and application scenarios, such as load, speed, working environment, etc. Therefore, it is very important to choose the appropriate quality grade to ensure the performance and life of the pillow block ball bearing.
2. Commonly used materials for outer spherical bearings include the following：
| Chromium steel | Chromium steel is the most common outer spherical bearing material, with good strength and wear resistance, suitable for most applications under general working conditions. |
| Stainless steel | Stainless steel outer spherical bearings have corrosion resistance and are suitable for applications in humid and corrosive environments, such as food processing equipment, chemical industry equipment, etc. |
| Cast Iron | Cast iron outer spherical bearings have high rigidity and wear resistance, and are suitable for applications with heavy loads and high-impact loads, such as metallurgical equipment, mining machinery, etc. |
| Plastic | Plastic outer spherical bearings have good corrosion resistance and self-lubricating properties and are suitable for some special environments or applications requiring low noise, such as fans and motors. |
| Fiberglass Reinforced Plastic | FRP outer spherical bearings have high strength, lightweight and corrosion resistance, and are suitable for applications in special environments such as the chemical industry and marine equipment. |
The material of the pillow block ball bearing should be selected according to the specific working conditions and requirements, taking into account load, speed, temperature, corrosion, and other factors. In special environments or special needs, pillow block ball bearings of other materials, such as ceramics and composite materials, can also be used. It is recommended to consult a professional bearing manufacturer or relevant technical personnel when selecting the material of the pillow block ball bearing to ensure that the appropriate material is selected to meet the application requirements.
3. The commonly used outer spherical bearing models are as follows:
 (1)UC-type: UC200 series, UC300 series, etc. |  (2)UK-type: UK200 series, UK300 series, etc. |  (3)UCP-type: UCP200 series, UCP300 series, etc. |  (4)UCF-type: UCF200 series, UCF300 series, etc. |  (5)UCFL type: UCFL200 series, UCFL300 series, etc. |  (6)UCT type: UCT200 series, UCT300 series, etc. |
These models cover the common types of pillow block ball bearings and are suitable for different mechanical equipment and working conditions. Each model has its specific structure and size, and the appropriate model and size can be selected according to specific needs. When selecting the type of outer spherical bearing, factors such as the bearing's load capacity, speed requirements, and installation method need to be considered to ensure the performance and reliability of the bearing.
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