Bearing Size Chart: How to Find the Right Bearing by ID, OD and Width

When customers need to replace a bearing, they do not always know the exact bearing model. In many cases, they only have the old bearing, a product drawing, or three basic dimensions: ID, OD, and Width. This is why a bearing size chart is very useful for OEM buyers, maintenance teams, and distributors.

ID means inner diameter. It is the size of the bearing hole and must match the shaft diameter. OD means outer diameter. It must match the housing or installation space. Width means the thickness of the bearing. These three dimensions are the most important starting points for identifying the correct bearing model.

For example, a bearing with 10mm ID, 30mm OD, and 9mm width is usually related to the 6200 series. A bearing with 12mm ID, 28mm OD, and 8mm width may be 6001. For miniature bearings, dimensions are even more important because a small difference of 1mm can mean a completely different model. Models such as MR106ZZ, MR115ZZ, MR126ZZ, 685ZZ, 695ZZ, 608ZZ, 6201ZZ, and 6202ZZ are commonly selected by size.

However, bearing selection should not depend only on dimensions. Buyers also need to check the bearing structure, such as open type, ZZ metal shield, or 2RS rubber seal. Material is also important. Chrome steel bearings are commonly used in standard applications, while stainless steel bearings are better for humid or corrosion-sensitive environments.

Clearance, grease, noise level, and speed requirement should also be considered. A bearing used in a high-speed motor may need low-friction grease and better noise control. A bearing used in outdoor or dusty equipment may need better sealing. A bearing used in precision instruments may require smoother rotation and tighter quality control.

At LUMI Bearing, we can help global customers identify bearing models by size, photo, sample, or application information. If you only know the ID, OD, and width, our team can help check possible models and recommend the right structure based on your working environment.

LUMI Bearing supplies miniature bearings, small deep groove ball bearings, stainless steel bearings, flanged bearings, high-speed bearings, and OEM bearing solutions. For buyers who need accurate model selection, stable quality, and long-term supply, LUMI Bearing can provide professional support from China.