Perfect combination of drive shaft with ball bearings, rotor and lower bearing made of PTFE/PEEK and a conductor made of borosilicate glass. Requires little space due to compact construction. No leakage or memory effects due to non-porous, welded rotor. This rotor holds the stirrer shaft by means of three stud screws which are fixed in the counterbores of the stirrer shaft. This provides optimum power transmission and a safe fixing. The 6 mm square can be fixed into the stirrer coupling or into the agitator. Dia. of stirrer shaft mm 8, Height (H) mm 140, Conductor NS 45/40, Top of ground joint to top of stirrer shaft mm L2 25, Insertion length of stirrer shaft mm L4 97