Ball Bearing With Top Screw And Outer Cylindrical Surface

As a common type of insert ball bearings, ball bearings with set screws on the outer cylindrical surface are widely used in various mechanical equipment due to their core advantages of easy installation and good self-aligning performance. In terms of model series, they mainly include the UC200 series (light-duty series), UC300 series (heavy-duty series), and the modified UB (SB) 200 series. For actual selection, the UC200 series is preferred when the load is relatively small, while the UC300 series is chosen for heavier loads. In terms of structural design, one end of the bearing's inner ring is usually equipped with two hexagon socket set screws with an included angle of approximately 120°. The bearing is fixed on the shaft by tightening the set screws against it. Meanwhile, the inner ring undergoes a special quenching process—only the surrounding area of the raceway surface is quenched, keeping the area around the set screw holes soft and more tough. This effectively prevents the inner ring from cracking when the set screws are tightened and the set screws from suddenly loosening during operation. In the aspect of sealing and lubrication, such bearings are generally equipped with sealing rings on both sides, which can tightly block the intrusion of contaminants. Additionally, an appropriate amount of lubricant is pre-filled at the factory, so there is usually no need for additional cleaning or refilling of lubricant before installation, simplifying the installation process. Regarding self-aligning performance, the outer diameter surface of the bearing's outer ring is of a spherical structure, which can be matched with a bearing housing with a spherical inner hole. It has a certain self-aligning capability, which can compensate for issues such as misalignment of the mechanical shaft center and avoid applying excessive external force to the bearing, thus ensuring stable operation. It should be noted that when the set screws on the protruding end of the bearing's inner ring are tightened on the shaft, the allowable axial load shall not exceed 20% of the basic dynamic load rating. This limit must be strictly followed during use to ensure the service life of the bearing. In terms of application fields, it is preferred for occasions requiring simple structures of equipment and components. Currently, it has been widely used in various manufacturing industries such as agricultural machinery, transportation systems, construction machinery, textile machinery, and ceramic machinery, providing support for the stable operation of various types of equipment.

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Product Introduction

As an important and widely used type in the family of insert ball bearings, ball bearings with set screws on the outer cylindrical surface have become a key supporting component for the stable operation of various mechanical equipment, thanks to their outstanding advantages of easy installation and excellent self-aligning performance. Their adaptability and practicality in various fields of industrial production are widely recognized.

In terms of model series classification, this type of bearing mainly covers three core series and modified products, namely the UC200 series (light-duty series), UC300 series (heavy-duty series), and the modified UB (SB) 200 series. Different series correspond to different load-carrying capacities. During the actual selection process, precise matching is required based on the load magnitude during equipment operation: when the equipment load is small and the bearing load requirement is relatively low, the UC200 series is preferred; if the equipment operates under high load and the bearing needs to have stronger load-carrying performance, the UC300 series should be selected. This ensures the compatibility between the bearing and the equipment, and guarantees the overall operation efficiency.

In terms of structural design, ball bearings with set screws on the outer cylindrical surface exhibit detailed and practical features. One end of the bearing's inner ring is usually equipped with two hexagon socket set screws, with an included angle of approximately 120° between the screws. This angle design allows the screws to bear force more evenly when tightened against the shaft surface. Through the tight fit between the set screws and the shaft, the bearing is firmly fixed on the shaft, effectively preventing relative displacement between the bearing and the shaft during operation. Meanwhile, the inner ring undergoes a special quenching process-instead of full quenching of the entire inner ring, only the area around the raceway surface is quenched. This keeps the raceway surface sufficiently hard to withstand operational wear, while the area around the set screw holes remains in a soft state with higher toughness. This differentiated treatment method not only meets the hardness requirement of the raceway surface during bearing operation but also effectively prevents the inner ring from cracking due to excessive local hardness when tightening the set screws. Additionally, it avoids sudden loosening of the set screws during bearing operation, further enhancing the safety and stability of the bearing's operation.

The design of the sealing and lubrication system provides strong support for the long-term stable operation of ball bearings with set screws on the outer cylindrical surface. This type of bearing is usually equipped with sealing rings on both sides. The tight fit between the sealing rings and the inner and outer rings of the bearing forms a reliable sealing barrier, which effectively blocks the intrusion of external contaminants such as dust, impurities, and moisture into the bearing interior. This prevents contaminants from causing wear or corrosion to the internal structure of the bearing, thereby extending the bearing's service life. Furthermore, before leaving the factory, the bearing is pre-filled with an appropriate amount of special lubricant by professionals in accordance with standard dosages. During bearing operation, this lubricant forms a stable oil film between the rolling elements and the raceway surface, reducing friction and wear, and lowering operational noise. Based on this, users generally do not need to perform additional cleaning on the bearing or add supplementary lubricant before installation, which greatly simplifies the installation process and saves installation time and labor costs.

Self-aligning performance is another core advantage of ball bearings with set screws on the outer cylindrical surface. The outer diameter surface of the bearing's outer ring adopts a spherical structural design, and it is used in conjunction with a bearing housing with a spherical inner hole. When the bearing is installed in this dedicated bearing housing, the spherical surface of the outer ring can be flexibly matched with the spherical inner hole of the bearing housing. During the operation of mechanical equipment, if the mechanical shaft center deviates to a certain extent due to factors such as installation errors, equipment vibration, or component wear, the spherical structure of the bearing can achieve automatic self-alignment through slight angle adjustments. This compensates for the deviation caused by shaft center misalignment, avoids excessive external force being applied to the bearing due to misalignment, prevents damage to the bearing caused by excessive local stress, ensures the bearing always operates in a stable state, and improves the operational reliability of the entire equipment.

During use, special attention must be paid to the axial load limit of the bearing. After the set screws on the protruding end of the bearing's inner ring are tightened on the shaft, there is a clear limit on the axial load that the bearing can withstand-specifically, it must not exceed 20% of its basic dynamic load rating. The basic dynamic load rating is a core performance parameter of the bearing, representing the constant radial load that the bearing can withstand under the rated service life condition. If the axial load exceeds this limit, it will cause an imbalance in the internal force of the bearing, accelerate the wear of the rolling elements and the raceway surface, and in severe cases, may lead to premature failure of the bearing or even equipment breakdown. Therefore, in practical applications, this load limit requirement must be strictly followed. The axial load should be reasonably controlled based on the actual operating conditions of the equipment to ensure the bearing operates within the safe load range and maximize its service life.

In terms of application fields, ball bearings with set screws on the outer cylindrical surface, with their characteristics of simple structure, easy installation, and strong adaptability, are preferred for occasions that require a simple structure of equipment and components and no complex installation and commissioning. Currently, this type of bearing has been widely used in various mechanical equipment across multiple manufacturing industries. Examples include agricultural machinery such as tractors and harvesters, transportation systems such as conveyor belts and hoists, construction machinery such as mixers and cranes, as well as specialized production equipment in industries such as textile machinery and ceramic machinery. In these devices, ball bearings with set screws on the outer cylindrical surface all play an important role in support and transmission, providing solid guarantees for the stable and efficient operation of various equipment, and becoming a crucial basic component for promoting the smooth progress of production in various industries.

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