B7221-C-T-P4S-UL

The B7221-C-T-P4S-UL is a single-row angular contact ball bearing specifically engineered for high-precision applications, most notably in machine tool spindles. Its designation outlines its key characteristics: a "C" for its 15° contact angle, ideal for accommodating radial and axial loads in one direction, and a "T" indicating a robust textile-laminated phenolic resin cage guided by the outer ring. This cage design is lightweight and promotes excellent lubricant flow, which is critical for high-speed operation. The "P4S" signifies a superior level of dimensional and running accuracy, surpassing standard P4 tolerances, ensuring minimal runout and enhanced rigidity. This bearing is manufactured with restricted tolerances, making it a top-tier component for achieving exceptional rotational precision.

The primary advantage of the B7221-C-T-P4S-UL lies in its universal design for matched set mounting, indicated by the "UL" suffix. This feature allows for the flexible arrangement of single bearings in pairs (back-to-back, face-to-face) or larger sets to handle combined loads and provide a specific degree of system rigidity and a light preload. Its high-precision manufacturing and specific contact angle make it exceptionally suited for applications demanding high rotational speeds, accuracy, and excellent axial and radial support. The result is improved machining surface finishes, reduced vibration, and extended operational life for high-performance equipment. This makes it an essential component for CNC machining centers, high-speed grinding spindles, and other precision industrial machinery where accuracy is non-negotiable.

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