51102 Flat Thrust Bearing 15x28x9mm For Small Medium Machinery

51102 Flat Thrust Bearing 15×28×9mm Reliable Axial Support For Small-Medium Machinery

The 51102 flat thrust bearing falls into the category of single-direction thrust ball bearings. It plays a crucial role in providing axial support in numerous mechanical transmission systems such as machine tools, construction machinery, and automated equipment. Its precise dimensional design and reliable performance enable it to fit specific mechanical components, ensuring efficient and stable operation of the equipment.

1. Basic Dimensions

1. Inner Diameter (d): 15mm. This inner diameter is designed through rigorous engineering calculations and standardization, allowing it to perfectly match standard transmission shafts with a diameter of 15mm. The tight fitting clearance can effectively transmit axial force, preventing shaft displacement or operational vibration caused by loose fitting, thus ensuring the transmission stability of the mechanical system from the perspective of basic dimensions.

2. Outer Diameter (D): 28mm. The outer diameter forms a scientific dimensional ratio with the inner diameter. It can not only fit the installation cavity of the equipment housing or support base to provide sufficient installation space for the rolling element and cage assembly, but also control the overall radial volume of the bearing. This meets the space layout requirements for equipment compactness, making it particularly suitable for small and medium-sized machinery with complex internal structures.

3. Thickness (T): 9mm. The thickness design takes into account both load-bearing strength and operational flexibility. A thickness of 9mm ensures that the bearing ring has sufficient structural strength to avoid plastic deformation when bearing axial loads. At the same time, the relatively compact thickness can reduce the frictional resistance during the movement of rolling elements, preventing heat generation issues caused by excessive thickness and ensuring the operational efficiency of the equipment at the rated speed.

2. Structural Features

It adopts a separable structure, consisting of three parts: the shaft washer (interference fit with the transmission shaft), the housing washer (transition fit with the equipment housing or support base), and the steel ball-cage assembly. This structure allows each component to be installed and disassembled independently, which not only simplifies the equipment assembly process but also facilitates the replacement of damaged components individually during later maintenance, reducing maintenance costs and downtime. It should be noted that this bearing can only bear single-direction axial loads and cannot bear radial loads. When in use, it needs to be combined with radial support components (such as deep groove ball bearings) to form a complete shafting support solution.

3. Core Materials

• Bearing Rings: High-carbon chromium bearing steel (e.g., SAE-52100) is used. After quenching and tempering, the hardness can reach HRC 60-64, which provides excellent wear resistance, fatigue resistance, and impact toughness. It can withstand the contact stress caused by axial loads for a long time, extending the service life of the bearing.

• Rolling Elements: Bearing steel balls of the same material are used. The surface undergoes precision grinding, with the roundness error controlled at the micron level. This can reduce frictional loss when in contact with the bearing rings and improve operational stability. Under special working conditions (such as corrosion-resistant or high-temperature environments), ceramic rolling elements (e.g., silicon nitride ceramics) can be selected to further optimize high-temperature resistance and corrosion resistance.

• Cages: Conventional models use nylon materials (e.g., PA66), which have the characteristics of light weight, low friction coefficient, and good self-lubrication. They can effectively guide the uniform distribution of steel balls and prevent collision between rolling elements. Under high-speed or high-temperature working conditions, stamped steel or brass cages can be used to enhance structural stability and high-temperature resistance.

4. Key Performance Parameters (Taking Mainstream Brands as Examples)

• Rated Load: The basic dynamic load rating (C) is approximately 10.5-10.6kN, and the basic static load rating (C₀) is approximately 16.8-18.3kN. It can meet the axial load requirements of small and medium-sized equipment, such as light conveyors and small elevator traction machines.

• Speed Performance: The limiting speed is approximately 6200-6700r/min under grease lubrication, and can reach 9400-10000r/min under oil lubrication. In actual use, the speed should be adjusted appropriately according to the lubrication method and load magnitude to avoid overheating damage caused by overspeed operation.

• Applicable Temperature: The applicable temperature range is -40℃ to 120℃ under conventional working conditions. With high-temperature grease and special materials, it can be extended to above 150℃, adapting to the equipment operation requirements in normal and medium-temperature environments.

5. Lubrication Requirements

Lubrication is a key link to ensure the performance of the bearing, and suitable lubricating media should be selected according to the working conditions:

• Grease Lubrication: Suitable for scenarios with low speed (≤6000r/min) and inconvenient frequent oil replenishment. Lithium-based grease (e.g., Grade EP2) is recommended, with a filling amount of 1/3-1/2 of the internal space of the bearing. It can play the roles of dust prevention, sealing, and friction reduction.

• Oil Lubrication: Suitable for high-speed (>6000r/min) or high-load working conditions. ISO VG32 or VG46 extreme pressure industrial gear oil is recommended. Lubrication is achieved through oil bath or oil injection methods, which can effectively take away the heat generated during operation and improve heat dissipation efficiency.

6. Typical Application Fields

Based on its dimensional and performance characteristics, the 51102 flat thrust bearing is widely used in:

• Small and medium-sized mechanical equipment: Such as dental treatment chairs, barcode printers, and small elevators, undertaking the functions of axial positioning and load transmission;

• Transmission systems: Such as the output shaft of reducers, axial support of motor end covers, and axial limit of Roots pump rotors;

• Light industry and agricultural equipment: Such as the roller shaft of knitting machinery, the hydraulic system of small tractors, and the main shaft of canning processing equipment, adapting to the light-load and medium-low speed operation requirements of the equipment.

With its precise dimensional design of 15mm inner diameter, 28mm outer diameter, and 9mm thickness, combined with a separable structure, high-wear-resistance materials, and stable load-bearing performance, the 51102 flat thrust bearing has become an ideal choice for various small and medium-sized machinery that require high axial support accuracy and space compactness. It can provide reliable axial support guarantee for the long-term stable operation of the equipment.