What Are Ball Bearings Used For? | The Spinning Workhorses

Ball bearings reduce rotational friction and support loads in virtually every machine that spins, from electric motors to skateboards.

That question — what are ball bearings used for — has a surprisingly wide answer, because these small steel spheres quietly enable smooth rotation in everything from your washing machine to a jet engine’s auxiliary systems. They work by placing rolling elements between two moving rings, which turns sliding friction into much smaller rolling friction. That single trick is why a ceiling fan spins freely for years and why a skateboard wheel doesn’t grind to a halt.

How Ball Bearings Do Their Job

Ball bearings separate an inner ring and an outer ring with a set of hardened steel balls. As the shaft rotates, the balls roll between the two rings instead of rubbing against them. Rolling friction is dramatically lower than sliding friction, which means less heat, less wear, and far less energy wasted.

The design handles two kinds of forces at once:

• Radial loads — forces pushing perpendicular to the shaft, like the weight of a wheel bearing down on its axle.
• Axial loads — forces pushing along the shaft’s length, but only in specific bearing designs built for that purpose.

That dual capability is what makes them such a general-purpose solution across so many industries.

Everyday and Industrial Uses

Ball bearings are the quiet backbone of rotating machinery. In industry, they appear in electric motors, pumps, conveyors, gearboxes, and alternators — anywhere a shaft spins under load. Automotive engineers put them in engines, transmissions, and driveline components, while consumer products rely on them just as heavily: your washing machine’s drum, a ceiling fan’s motor, a food processor’s blade assembly, and a fishing reel’s spool all spin on ball bearings.

Sports and recreation equipment leans on them too. Skateboards, inline skates, and bicycles all use ball bearings in their wheels — skateboard bearings are commonly rated with the ABEC precision scale, which measures manufacturing tolerance. On the high-performance end, machine-tool spindles, medical equipment, and some aerospace applications demand precision ball bearings built to exacting standards.

If you’re looking to replace or upgrade bearings for a project, our tested roundup of the best ball bearings covers the top options for common sizes and uses.

Matching the Bearing Type to the Job

Not all ball bearings are the same — different designs suit different load conditions. The four main types each solve a specific problem:

There are two load limits worth knowing. First, ball bearings prefer moderate loads and high speeds — they deform under severe overload, so heavy industrial presses use roller bearings instead. Second, thrust ball bearings handle axial load only, meaning they cannot substitute for a radial-load bearing in a machine that exerts sideways force.

When Ball Bearings Are Not the Answer

For very heavy loads, ball bearings are the wrong tool. Their point-contact design is efficient at high speed but structurally weaker than roller bearings, which use line contact to spread heavy forces across a larger surface. Overloading a ball bearing causes the balls to deform or the races to Brinell — a permanent dent that eventually destroys the bearing.

Some applications demand precision-grade bearings with tighter tolerances, which is why specifications matter. A skateboard wheel bearing, for instance, does not need the same precision as a machine-tool spindle bearing, and buying a higher ABEC rating than the application requires is usually wasted money.