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Ball bearings are available in all different sizes, depending on the shaft size and requirements of the application. As they are used in all types of industries, they are needed for a large variety of application sizes, from skateboard wheels to oil drills. How are these bearing sizes determined?
Bearings are measured by their inner diameter, outer diameter, and width; the size of a bearing is normally listed as such: ID x OD x W. These measurements are normally taken in millimeters, but can be converted to inches. In fact, most manufacturers and suppliers offer bearing measurements in both imperial and metric systems.
Each combination of these measurements corresponds to a series number, usually located directly on the bearing. Ball bearing size charts are widely available, and can be used to find the measurements of a specific bearing. Series and are the most commonly used, and typically range from 10 x 30 x 9 mm (.394 x 1.181 x .354 in) to 150 x 320 x 65 mm (5.906 x 12.598 x 2.559 in).
Size Inner Dimension (mm) Outer Dimension (mm) Width (mm) Dynamic (Cr) Static (Cor) Weight (lb) 10 30 9 535 0.070 12 32 10 686 0.077 15 35 11 836 0.099 17 40 12 0.141 20 47 14 0.227 47 52 15 0.279 30 62 16 0.440 35 72 17 0.634 40 80 15 0.810 45 85 19 0.915 50 90 20 1.019 55 100 21 1.335 60 110 22 1.723 65 120 23 2.178 70 125 24 2.354 75 130 25 2.596 80 140 26 3.080 85 150 28 3.938 90 160 30 4.730 95 170 32 5.764 100 180 34 6.908 105 190 36 8.140 110 200 38 9.592 120 215 40 12.386 130 230 40 13.728 140 250 42 17.754 150 270 45 22.660
As stated before, size depends on the shaft size and application requirements. Bearing size can greatly impact the performance and capabilities of a ball bearing; therefore different sizes are used in different industries.
Generally, smaller ball bearings have more limited load capacities. They are used in applications where space-efficiency is more important than load capacity. Miniature bearings, often constructed as precision ball bearings, are used for extremely small applications, such as medical instrumentation, robotics, or semiconductor equipment. On the other hand, larger bearings have greater load capacities. They are used for heavy-duty industries such as agriculture machinery, mining and drilling equipment, or heavy power tools. Many manufacturers also offer custom bearing size options for very specific applications that have unique requirements.
It is not uncommon that the bearing identification number may be illegible or worn completely after long term use, requiring a bearing to be measured manually. This can easily be done using a vernier caliper to easily provide accurate measurements. If this tool is not available, measurements can be taken carefully using a ruler.
If you are looking for a proper bearing match or replacement, you will also need to pay attention to some other important aspects of the bearing number to find the correct bearing. The suffix can contain a few details about the bearing design and features:
Each manufacturer may use unique suffix codes; it is best to look up a suffix guide to find the correct bearing match or replacement.
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Sometimes you may need to identify a bearing due to general wear and tear. Most bearing references now are laser stamped but these wear and rub off more quickly than the previous method, which was engraved deep in the bearing's metal.
Each bearing has an inside diameter, outside diameter and width diameter in that order. Most bearings are metric in size, but can also be imperial. On our site, each bearing shows its principal dimensions.
d = Inside diameter
D = Outside diameter
B/T = Width diameter
You can search for a bearing entering this information on the home page in the boxes provided.
Once you have identified the bearing's code some bearings come complete with seals or shields. This is known as the suffix in the bearings reference.
2RS1C3
The bearing type design that you need is a single row deep groove ball bearing with the following dimensions and suffix.
d = 25mm
D = 52mm
B/T = 15mm
Result =
The bearing also has a seal either side of the bearing.
2RS1 = 2 Rubber seals
2RSR = 2 Rubber seals
DDU = 2 Rubber seals
2Z = 2 Metal shields
ZZ = 2 Metal Shields
Result = 2RS1
And the internal clearance being C3 means that the bearing has room for expansion if needed between the races of the bearing, whilst holding the outer ring and moving the inner ring in a radial movement you will detect a little amount of play between the 2 rings. All standard clearance bearings have this movement, it may only be a small amount of movement but is controlled by international standards. C3 means the bearing has more clearance than standard.
For example we may use C3 clearance on bearings where a cold start up application my cause the balls to heat up quickly, the heat needs to go somewhere. Some of the heat gets passed through the outer race to the housing and the inner race to the shaft, this causes expansion which closes up the clearance in the bearing. If you did not allow for this clearance the bearing would not have room for expansion and lead to bearing failure.
C2 = Clearance less than normal
C3 = Clearance greater than normal
C4 = Clearance greater than C3
Result = 2RS1C3
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