Angular contact ball bearings are a type of precision bearing designed to support combined radial and axial loads, as well as pure axial loads, in a specific direction. These bearings are engineered with raceways in the inner and outer rings that are designed to accommodate high-speed and high-precision applications, particularly in machinery and equipment where precise positioning and controlled motion are essential.

A deep groove in a ball bearing refers to the specific design feature of the bearing's inner and outer raceways, which allows it to accommodate radial and axial loads while enabling smooth and efficient rotation. The deep groove is a critical aspect of the ball bearing's construction and contributes to its performance in various applications.

   - Cylindrical Roller Bearings: Cylindrical roller bearings consist of cylindrical rollers held in place by inner and outer rings, with the rollers positioned parallel to the axis of the bearing. They are designed to primarily support radial loads and provide high rigidity and precision.

   - They have raceways that are parallel to the bearing axis, allowing them to effectively support radial loads and provide smooth and efficient rotation of shafts and components.