This listing is for 2 piece/s.Deep groove ball bearings are particularly versatile. They are simple in design, non-separable, suitable for high and very high speeds and are robust in operation, requiring little maintenance. single row deep groove ball bearings have deep, uninterrupted raceway grooves. These raceway grooves have a close osculation with the balls, enabling the bearings to accommodate radial loads and axial loads in both directions. Specifications: Dimension Standards: ISO 15. Tolerances: ISO 492. Internal Clearance: ISO 5753-1. Permissible Misalignment: ≈ 2 to 10 minutes of arc. Misalignment increases bearing noise and reduces bearing service life, and when it exceeds the guideline values these effects become particularly noticeable.