The TX-7310 set pairs two angular contact bearings ground as a matched unit, so preload after mounting lands where the spindle design expects it. The 40-degree contact angle carries heavy axial load in one direction; mounted back-to-back, the pair locates the shaft rigidly in both.
Brass cages are standard on this series for their tolerance of vibration and marginal lubrication during run-in. Rings and balls are matched for grade and batch, and each set ships in a single sealed pack with the mounting arrangement printed inside the lid.
Typical homes are pump shafts, gearbox input stages and machine spindles where a plain deep groove bearing would skid or wander.
