How to find the right Thrust Ball Bearings AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Thrust Ball Bearings
- Axial load only
- Thrust ball bearings carry axial load only and must not take radial load. Pair them with a radial bearing when radial loads are present. Radial load quickly damages the grooves in the washers.
- Single or double direction
- Single-direction series (511xx, 512xx, 513xx) take thrust one way. Double-direction series (522xx, 523xx) take thrust both ways, using a central shaft washer. The wrong type leaves reversing thrust unsupported.
- Shaft washer versus housing washer
- The washer with the smaller bore goes on the shaft. The washer with the slightly larger bore sits in the housing and must clear the shaft. Swapping the washers makes one rub against the shaft or housing, which causes wear and heat.
- Minimum axial load
- Keep a minimum axial load on the bearing at all times (from preload, springs or gravity), especially at higher speed. Without load, the balls skid and spin from centrifugal and gyroscopic effects, damaging the raceways.
- Speed and alignment
- Use them at low to moderate speed only. If the support face may not be square, use versions with a sphered washer and aligning seat washer. Thrust ball bearings have low speed limits and do not accept misalignment.
Brands that matter
- SKF: Full 511/512/513/522 range, including aligning seat washers.
- Schaeffler (FAG / INA): Broad thrust ball range; INA also covers axial needle alternatives.
- NSK: Common source for single- and double-direction designs.
- NTN: Full-line alternative with ISO-standard designations.
- Timken: Offers thrust ball designs alongside its roller thrust bearings.
What to avoid
- Using a thrust ball bearing as the only support on a shaft with radial load.
- Running a thrust ball bearing unloaded or at high speed.
- Installing the shaft and housing washers the wrong way round.
Questions
Which washer goes on the shaft?
The one with the smaller bore that fits snugly on the shaft. The other washer has a slightly larger bore and should rest against the housing without touching the shaft.