The RfN 7012 is a Ringfeder locking assembly (bush) from the 7012 series designed for shaft-to-hub connections requiring high torque transmission and axial holding. Installation involves the shaft being inserted through the locking bush with radial screws creating interference fit. Critical verification: confirm shaft and bore tolerances match RfN 7012 specifications (typically h7/p6 range) to ensure proper locking performance.