ENGINEERING INTRODUCTION
Timken is a leader in the advancement of bearing technology. Expert craftsmanship, well-equipped production facilities, and a continuing investment in technology programs ensure that our products are synonymous with quality and reliability. Today, our plants manufacture thousands of bearing types and sizes to handle a wide range of application requirements.Anti-friction bearings inherently manage broad ranges of speed and many combinations of radial and thrust loads. Environmental conditions such as low and high temperature, dust and dirt, moisture, and unusual mounting conditions, affect bearing operation.If complex bearing applications are involved, consult your Timken representative.

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ROLLER BEARING SELECTION PROCESS
Bearing selection is a process of evaluating the suitability of bearings for specifi c industrial applications. The quality of the available information to make these selections will play a major role in determining the success of the bearing choice. The fi rst step in bearing selection is identifying the proper roller element type, whether it is a ball, needle, cylindrical, spherical or tapered roller bearing. Each roller bearing type has advantages and disadvantages that are design-specifi c and will affect such things as the loads and speeds the bearing can sustain in the application.Next, assess the size constraints of the bearing envelope or available space. This is done by considering the minimum shaft diameter, maximum housing bore and available width in the bearing application. After the bearing envelope is defi ned, search the catalog for bearings with bores, outer diameters and widths that will fi t in the bearing envelope. There may be several bearings with different load-carrying capacities available that fi t in the envelope. Of the bearings fi tting the envelope, the next step is to determine which of these bearings will give the desired life in the application by performing a bearing life analysis.The bearing selection is completed once the design options are chosen. These options include cage type, cylindrical roller bearing fl ange arrangements, radial internal clearance or setting, and precision level and lubrication. These options are selected based on the application’s speed, temperature, mounting and loading conditions, and will enable you to achieve optimum bearing performance and life. This catalog assumes that a spherical roller bearing has been selected for the application, and highlights the data and methods to use during the selection process. For a closer look, your Timken representative can provide you with expert computer analysis to give you the most detailed information for your bearing application. Tapered Roller Thrust Tapered Cylindrical Roller Thrust Cylindrical Spherical Roller Thrust Spherical Thrust Ball Needle Roller Thrust Needle Characteristic Bearing Roller Bearing Bearing Roller Bearing Bearing Roller Bearing Ball Bearing Bearing Bearing Roller Bearing Pure Radial Load Excellent Unsuitable Excellent Unsuitable Excellent Unsuitable Good Poor Excellent Unsuitable Pure Axial Load Good Excellent Unsuitable Good Fair Excellent Fair Excellent Unsuitable Excellent Combined Load Excellent Fair Fair Unsuitable Excellent Fair Good Poor Unsuitable Unsuitable Moment Load Fair Poor Unsuitable Unsuitable Unsuitable Unsuitable Good Poor Fair Unsuitable High Stiffness Excellent Excellent Good Excellent Good Good Fair Good Good Excellent Quiet Running Fair Fair Good Poor Fair Poor Excellent Good Good Fair Low Friction Fair Fair Good Poor Fair Fair Excellent Excellent Good Good Misalignment Poor Poor Poor Unsuitable Excellent Excellent Good Poor Poor Poor Locating Position Excellent Good Fair Fair Good Good Good Excellent Unsuitable Excellent (Fixed) Non-Locating Good Unsuitable Excellent Unsuitable Fair Unsuitable Good Unsuitable Good Unsuitable Position (Floating) Speed Good Good Good Poor Fair Fair Excellent Excellent Good Poor Table 1. Comparison of rolling element bearing types. SPHERICAL ROLLER BEARING CATALOG 17 179761_003-19017 7/19/079:17:25PM