The most common high precision bearing is the angular contact bearing, also referred to as a spindle bearing. This high precision bearing is commonly found on most machine tools, where accuracy, speed and rigidity are critical. While precision angular contacts are available for purchase as a single bearing.

These are precision angular contact bearings, non-separable with outer rings relieved and available with 15° or 25° contact angles. For critical applications these bearings are stocked as universally ground duplex pairs with standard preloads and as single row bearings.Angular contact ball bearings.

Angular contact ball bearings are designed to support high radial-axial loads at high speeds. The rigidity of single-row angular contact bearings can be improved through pretension; therefore, they are applied to the principal axes of high-rotation precision machine tools.