The angle of contact in angular contact ball bearings is a critical design parameter that influences the bearing's load-carrying capacity, precision, rigidity, and high-speed capability. It allows the bearing to operate efficiently under dynamic and oscillating loads, making it suitable for applications where precise motion control and accurate load distribution 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.