ABM specializes in developing leading-edge super precision angular contact ball bearing series for modern machine tool spindles, precision instruments, and other devices carrying high load at utmost rotation speed
719, 70, and 72 are three major series of ABM super precision angular contact ball bearings. For same bearing bore diameter, 72 series has largest outside diameter and width, and can carry largest load at moderate speed. 719 and 70 series are more suitable for higher speed and limited space applications. Each of 719 and 70 series has even higher speed "H" version, which has smaller balls with more ball complement.