Thrust ball bearings

The thrust ball bearing is designed for axial loads: it consists of a shaft washer, a housing washer, and a cage with balls. It must not be loaded radially. Single-direction bearings take the load in one direction, and double-direction bearings in both. Selection is based on shaft and housing diameter, load magnitude and direction, speed, and mounting space.

Series 511, 512, 513, and 514 are single-direction and, with the same bore, increase in outside diameter and height: NTN 51120, 51220, 51320, and 51420. The last two digits multiplied by 5 give the bore diameter: 51120 is 100 mm and FAG 51104 is 20 mm; 51100 is the exception, at 10 mm. Double-direction bearings have the prefix 52, such as NSK 52232 X. SKF BTM 100 ATN9/P4CDBA and BTW 100 CTN9/SP are high-precision angular contact thrust ball bearings for machine tool spindles; the suffix TN9 indicates a polyamide cage.

They are used in spindles, rotary tables, lathe chucks, vertical pumps, and gearboxes where the main load is axial. They have a lower speed limit than a radial bearing and require a minimum axial load for the balls to roll properly. If the load reverses direction, a double-direction thrust bearing is required.

We carry NSK, NTN, SKF, and FAG thrust ball bearings. Send us the complete part number or the shaft diameter, outside diameter, and height via WhatsApp or email, along with the load and RPM if you want guidance, and we will quote you promptly.