A miniature bearing, also known as a mini bearing or small bearing, is a type of ball bearing that is designed to be smaller in size compared to standard bearings. These bearings are characterized by their compact dimensions and lightweight construction, making them ideal for applications where space is limited or weight needs to be minimized.

Miniature bearings typically have outer diameters ranging from a few millimeters to around 20 millimeters, although sizes can vary depending on the specific application requirements. They are commonly used in precision instruments, small electric motors, model airplanes and helicopters, robotics, dental equipment, and hobby applications.

Despite their smaller size, miniature bearings often offer high precision, smooth operation, and durability. They are available in various configurations, including open, shielded, and sealed designs, to suit different environmental conditions and performance requirements.

Miniature bearings are manufactured to high-quality standards to ensure reliability and performance, even in demanding applications. They are an essential component in many small-scale mechanical and electronic devices, contributing to their functionality and longevity.