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What are Ball Bearings?

A ball bearing is a type of rolling bearing in which a ball is placed between the inner and outer rings that reduces rotational friction and supports radial and axial loads. Also, it improves the efficiency of mechanical power transmission and is commonly used in light industrial machinery. A basic ball bearing comprises four components: a ball, an inner ring, an outer ring, and a cage or retainer. The balls and rings are typically made of high chromium steel. 

How Bearings Are Sized?

When measuring bearings, their inner diameter, outer diameter, and width are taken into account. The size of a bearing is typically indicated as ID x OD x W and is usually expressed in millimeters but can be converted to inches. Actually, most manufacturers and suppliers provide bearing measurements in both imperial and metric units.

The series number of a bearing can be found directly on the bearing and corresponds to a specific combination of measurements. To determine the measurements of a particular bearing, ball bearing size charts are readily accessible. The commonly used series are 6200 and 6300, which typically encompass sizes ranging 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). 

Importance of the Ball Bearing Size Chart

The ball bearing size chart offers a comprehensive reference guide to a wide range of dimensions and specifications for ball bearings.

The ball bearing size chart typically includes the following primary parameters: 

1. Bearing Dimensions

The size chart includes crucial measurements, including the inner diameter (bore diameter), outer diameter, and width of the bearing. These dimensions are crucial in establishing whether the bearing is compatible with the intended shaft and housing. 

2. Load Ratings

Ball bearings endure both radial and axial loads during operation. Load ratings listed in the size chart represent the maximum capacity a bearing can withstand without encountering premature failure.

3. Speed Ratings

The speed ratings establish the highest rotational speed at which a bearing can function without generating excessive heat or experiencing premature wear. 

4. Clearance

The internal gap between the balls and raceways of a bearing is known as bearing clearance. This clearance affects the axial and radial play of the bearing and also influences its thermal expansion characteristics.