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1. Factors That Affect Bearing Size
The size of a bearing is typically measured by its inner diameter (ID), outer diameter (OD), and width (W), and listed in the format "ID x OD x W." These measurements are usually given in millimeters, but can also be converted into inches. In fact, most bearing manufacturers and suppliers provide sizes in both metric and imperial systems.
Each set of these measurements corresponds to a series number, often marked directly on the bearing. There are numerous bearing size charts available in the market to help identify specific bearing dimensions. The 6000, 6200, and 6300 series are the most commonly used standard deep groove ball bearing series, with sizes ranging from 10 x 26 x 8 mm (0.394 x 1.024 x 0.315 inches) to 240 x 440 x 72 mm (9.448 x 17.322 x 2.834 inches).
ID = Bore(d), OD = Outer(D), W = Widrh(B)
The bearing size specification chart provides standardized data based on different bearing types and application scenarios. Generally, ball bearings come in both metric and imperial (inch-based) size standards.
Common Metric Sizes for Ball Bearings:
Ball BearingsCommon Imperial Sizes for Ball Bearings:Inch BearingsBearings vary greatly in size. The smallest "miniature bearings" in the world have an outer diameter of 2mm and an inner diameter of 0.6mm. On the other hand, large bearings can reach up to 6 meters in outer diameter and are used in massive tunnel boring machines for tunnel excavation.
The operating conditions of the application determine which of these factors most influence the bearings performance and life.
Which selection criteria to use depends on the bearing's operating conditions. For applications where bearings are running under normal operating conditions, use size selection based on rating life. For applications where bearings are running under low speeds or bad lubrication conditions, or where occasional peak loads occur, use size selection based on static load. In some applications, both selection criteria must be considered.
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Different sizes of bearings are used in different industries. Smaller ball bearings have more limited load capacities and are used in applications where space efficiency is more important than load capacity. Larger bearings have greater load capacities and are used for heavy-duty industries such as agriculture machinery, mining and drilling equipment, or heavy power tools. The proper bearing size is essential for optimal performance and to safeguard that the bearing can withstand the required load and provide the expected life.
Further Reading:
Discover more about the features and applications of various bearings.
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