5PCS High-precision T-slot U-slot Bearing U22T22 Track Wheel Pulley Bearing Over 12 Axis 8 * 22.5 * 14.5 * 13.5 mmHigh hardness and toughness: Bearing steel is a high-quality steel that is specifically designed for bearing applications. It is characterized by its high hardness and toughness, which makes it an excellent choice for applications that require high load-bearing capacity and durability. Design:This high-performance bearing features inner and outer races machined from hardened stainless steel and polished balls made of premium chrome steel for incredibly smooth, reliable operation even under extreme loads.Versatility: These bearings are widely used in a variety of small machinery applications, including skateboard wheels, inline skates, and electric motors.Easy Installation : The compact integrated corrosion resistant stainless steel construction allows for quick press fit installation into tight spaces without the need for fastening hardware or bonding agents.Superb Performance : The meticulous hand-finishing and quality craftsmanship provide virtually frictionless, vibration-free and whisper-quiet spinning, making this bearing the smart choice for the most critical industrial equipment where failure is never an acceptable option.U22/T22(8 * 22.4 * 13.5 * 14.4) guideway roller bearing Inner diameter -DRB-d)8mm Outer diameter (d)22.4 mm Width (b)13.5 mm Width (c)14.4 mm Groove diameter dw 12mm U-groove t-grooveGroove chamfer (min)(rs)0.3 Material GCR15 bearing steel