Uniquely designed and lubricant free, these precision stirrer/stirring bearings are self-aligning. The saddle O-ring provides constant force and a positive seal on the stirring rod that allows vacuum operation to as low as 1mm. Ground finish rods from other manufacturers are not recommended for use with this bearing. Complete 10mm diameter assembly includes PTFE stirrer bearing, PTFE bushing, saddle O-ring (LG-9470-300), threaded heavy wall borosilicate glass adapter, and top cap (LG-10818-114). See LG-9501 for polished stirrer rods or LG-9502 for stainless steel rods. Scientists rely on the expertise and artistic skills of Wilmad-LabGlass engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.