The MT system is for small centre distances and low torque requirements. The minimum centre distance is 10 mm; below this heads reliability becomes questionable.

MT units are normally very compact and with 3 or 4 spindles weigh little, 2 kg for example, and are permanent grease lubricated.

Rotating components are hardened and ground, and are carried in anti-friction bearings enabling these heads to run up to 10.000 rpm. In special cases, MT heads are built with large bodies and high numbers of spindles, even in excess of 20.