Grease-Free PTFE stirrer bearing for use under moderate vacuum. The bearing consists of a PTFE standard taper body, Nylon compression cap, PTFE Insert/bushing and a Nylon loosening nut. The PTFE insert/bushing provides only glass and PTFE contact with the reaction. Loosening nut above the standard taper inner joint allows easy and quick removal. Supplied complete with a Perfluoro o-ring on the body and a Viton o-ring on the bushing.