Types of Bearings

Single-Row and Double-Row Ball Bearings

Includes bearings of 6000, 6200, 6300, 6400 standard series and special size bearings. Ball bearings have the highest speed ratings among all bearing types. Due to spherical shape of the balls, only the top part of the balls run over the raceways. Since it has a point contact with the raceways, unlike line contact in roller bearings, lower friction and higher speed ratings can be reached. Depending on the radial clearance and under normal working conditions, the bearing can be assembled with angle of 8-16 minutes. Standard serial production includes non-contact seal single-row deep groove ball bearings as well as contact seals. Bearings with a seal on each side do not require maintenance. Radial load capacity in double-row deep groove ball bearings is higher than that of single-row counterpart; however, axial load capacity will be smaller. The mounting of these bearings cannot be slanted.

Self-aligning Ball Bearings

Includes bearings of 1200, 2200 standard series and special size bearings. Self-aligning ball bearings have their outer ring raceways in concave shape and cannot be disassembled. Therefore, the angle of the bearing can be modified. These bearings will not be affected by axial changes of up to 4 degrees. Self-aligning bearings with larger bore diameter require rolled shafts for assembly.

Angular Contact Ball Bearings

Includes bearings of 7200, 7300, QJ series, and special size bearings. Single-row angular contact ball bearings can hold axial loads from only one side. Therefore, they need to be assembled with another bearing. Single-row angular contact ball bearings cannot be disassembled. Load angle is 40 degrees. The best load distribution is attained when the load ratio is 1 (Fa/Fr=1). These bearings can work under higher speed and should be close to its counterpart bearing as the changes in shaft temperature affects the bearing internal clearance.

Cylindrical Roller Bearings

Cylindrical roller bearings are radial bearings that can be disassembled. Line contact between rings and rollers are modified to make sure raceway forms have a crown on them so that the shoulder stresses are minimized. Radial load capacity allows an assembly angle of 2-4 minutes. Cylindrical roller bearings have larger radial load capacity than ball bearings. The part numbering (N, NJ, NU, NUP, HJ, RNU, RN) is based on the type of inner ring and the components used in the bearing. These bearings mostly have plastic cages. N and NU types of cylindrical roller bearings and needle roller bearings can only be loaded radially. All others can have both radial and axial loads.

Tapered Roller Bearings

Tapered roller bearings are classified as metric and inch series. Inch series tapered roller bearings have a special coding. Metric series bearings include 30000, 31000, 32000, and 33000 series and special size bearings. Tapered roller bearings can be disassembled. Line contact between rings and rollers are modified to make sure raceway forms have a crown on them so that the shoulder stresses are minimized. Tapered roller bearings can hold axial loads from only one side. Therefore, they need to be assembled with another bearing. The bearing is chosen based on the radial load ratings. These bearings should be close to its counterpart bearing as the changes in shaft temperature affects the bearing internal clearance. The internal clearance of the bearing should be chosen based on the counterpart bearing.

Self-aligning Roller Bearings

Self-aligning roller bearings have their outer ring raceways in concave shape and cannot be disassembled. Therefore, the angle of the bearing can be modified. These bearings will not be affected by axial changes of up to 0.5 degrees. When working under loads of durability limits, lubrication issues might arise. The bearings are mostly lubricated through canals located at the outer ring. These bearings mostly have plastic cages.