PTFE covered stainless steel stirring shafts, 10mm OD, drilled type. If used unlubricated, 500 rpm max with water cooled 8040 bearing, 100 rpm max recommended with 8036, 8038, 8039, 8043, 8047, 8051 and 8055 bearings. With condensate film as added heat transfer agent, 2000 rpm can be attained. Drilled type shaft accepts 8088, 8089, 8090 & 8091 agitators. Compatible with our 13443 collet-type bearing. Join to stirrer motor using 8124 series chucks.