Top 12 Linear Ball Bearings

Linear bearings allow movement of a significant amount of weight in a linear motion with minimum friction. They are ball bearings that provide point contact with the sliding part. On contact, balls rotate on their own axis, offering very little frictional resistance to obtain smooth movement with high precision. They are used in conjunction with a cylindrical shaft or rail.

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Linear Ball Bearings Buying Guide

Linear ball bearings are made of Chromium steel shell and bearing balls. They come in cylindrical shapes with rubber seals at both ends to prevent the entry of moisture, dirt etc. for easy movement and long life.  The available options include Standard lengths, extra-long & open type. They are provided with a small dimple on the outer diameter to fit with the anti-rotation pin provided in machine housing to locate the bearing and prevent rotation of the bearing. They are also offered with flanged ends for fitment. These ones come in round, square & oval shapes with different lengths.

Uses of Linear Ball Bearings

They find application in 3-D printer rail unit, laser-engraving rail set up & for construction and replacement of small planning machine, table carriers, rails and parts. Linear ball bearings housed in rectangular blocks are made of Aluminium alloy with oxidation treatment to prevent corrosion.

Points to be noted before purchase

For new application, machine designer needs to note the recommended load limitations mentioned in the manufacturer’s catalogue & select suitable bearing. The number engraved on the bearing needs to be noted & new bearings having the same number can be used for replacement requirement. If the bearing number is not visible, dimensions like Inner diameter, outer diameter and length can be noted. Noting the other features like, cylindrical type, flanged type or block type & whether end seals are provided, a suitable replacement can be found from the product catalogues.

Ensure enhanced utility quotient

The following things may be considered while using linear ball bearings. Grease needs to be applied before use & only 25 to 35% bearing cavity to be filled with it. Excess filling to be avoided as it can cause overheating. Regular cleaning & maintenance to be ensured for long and trouble-free performance. The table needs to be level during installation; otherwise, it will interfere with installation calibration.