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These are the original and premium internal locking devices, fitting inside a component or hub. These units are most commonly used on applications in general engineering to transmit high torques and axial loads. Common types include 7012, 7013.0, 7013.1, 7014 and 7015.0. Most are available in metric series for shafts from 20 mm to 1000 mm dia. and inch sizes for shafts from 3/4” to 7.875” dia.