Stirring Shaft, 19mm, Polished, Chem-Stir, 3L-12L Flasks, 610mm OAL, Complete with PTFE Nut and Bolt. A 19mm OD precision ground and polished stirrer shaft with our patented Chem-Stir blade attachment system. Shaft (C) has been manufactured with a ring at the lower end to permit attachment of the blade (B) with a PTFE nut (D) and bolt (A). Shaft is supplied complete with PTFE nut and bolt set. For use with PTFE bearings such as the CG-2086. Polished shaft will not cause abrasion to the sealing surfaces of the PTFE bearing, thereby allowing a vacuum tight seal. Uses the same PTFE nut and bolt blade attachment method as the CG-2084 ground shaft.PLEASE NOTE: STIRRER BLADES MUST BE PURCHASED SEPARATELY.THESE SHAFTS ARE NOT TO BE USED WITH ANY TYPE OF GLASS BEARING. FOR GROUND SHAFTS USED WITH GLASS BEARINGS SEE CG-2084.ALSO NOTE: 19MM SHAFTS HAVE A REDUCED DIAMETER TOP SECTION THAT IS 1/2"OD, PLEASE KEEP THIS IN MIND WHEN SELECTING THE PROPER SIZE COUPLING.