FIELD: mechanical engineering. SUBSTANCE: invention relates to device designed for closing holes providing access into space of drum-type object set into rotation. Proposed unit contains plug in form of threaded cylindrical body and head, and it is furnished with device installed between head and drum rotor body to create axial force in plug. Axial force building device is made of at least one cylindrical element installed in round socket of drum rotor body under head of plug for radial sliding in socket. Cylindrical element is provided with sharp conical end piece pointed to plug head, or with other sharp projections on this end whose hardness exceeds that of plug metal. EFFECT: improved reliability of plug locking in time. 2 dwg
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