SKF 7311BYG Angular Contact Ball Bearing

The 7311BYG angular contact ball bearing is a single-row, open precision bearing designed to handle combined radial and axial loads at high speeds. It has a bore of 55 mm, an outer diameter of 120 mm, and a width of 29 mm, with a 40° contact angle and open construction (no seals or shields). The 7311BYG designation (also listed as 7311 BG with Y3) identifies this size and geometry within the 73-series family, delivering load-bearing performance suitable for spindle and other high-speed machinery where accurate alignment and smooth rotation are essential. Angular contact bearings of this type achieve their load-carrying capabilities through angled raceways in the inner and outer rings, enabling stable operation under combined loading while maintaining relatively high rotational speeds.