Double Row Spherical Roller Bearings — 21316, 21317, 21318 CA W33 family (includes 21318 CA W33 / 21318W33) Key benefits High radial load capacity for heavy-duty service. Self-aligning design tolerates shaft misalignment and realistic mounting tolerances. Robust construction and precise machining for long service life and reliable operation. CA W33 rating supports stable performance across operating temperatures. Reduces downtime, simplifies maintenance, and maintains smooth, steady rotation under tough conditions. Function and performance Double row spherical rollers distribute radial loads evenly and allow angular misalignment without loss of function. Built to perform in demanding industrial environments where heavy radial loads and shaft deflection occur. CA W33 family construction provides consistent performance over a wide range of operating temperatures. Compatibility and sizes Available in multiple bore sizes within the 21316, 21317, 21318 CA W33 family to match common shaft diameters. Compatible with standard housings and shafts used for these models, enabling straightforward replacement and retrofit. Includes the 21318 CA W33 (21318W33) specification for exact-match applications. Material and build Manufactured from standard bearing steel with precise machining for dimensional accuracy and durability. Engineered for dependable rolling contact, wear resistance, and long-term reliability in industrial use. Typical applications and use scenarios Conveyors and material handling in mining or aggregate plants: handles heavy radial loads and reduces stoppages caused by shaft misalignment. Heavy equipment with misalignment (cranes, excavators): self-aligning rollers maintain smooth rotation despite shaft deflection or mounting tolerance issues. Gearboxes in wind turbines and other demanding industrial systems: robust construction supports continuous operation under variable loads and temperatures. How it helps you Minimizes unexpected failures and downtime by providing a durable bearing solution for heavy radial loads and misaligned shafts. Simplifies maintenance and parts replacement through standard sizes and compatibility with common housings and shafts. Keeps machinery running smoothly and steadily, improving operational uptime and reducing intervention frequency. Ordering information Specify the required bore size within the 21316, 21317, 21318 CA W33 family and reference the 21318 CA W33 (21318W33) when applicable to ensure correct fit and performance.