Because of the extremely slow speed requirements of a tonearm bearing, it is a popular choice to use unlubricated (dry) precision bearings. Shielded bearings are generally used because contact rubber seals create too much turning resistance. It is vital that the bearings are kept clean before final assembly, as dust will impede smooth motion. Equally, the bearing material must be corrosion resistant to prevent any rusting and to avoid the need for preservative oil on the outer bearing surfaces.
However, if you did want to achieve exceptionally reduced levels of friction using a lubricant, very low viscosity synthetic instrument oil is another option.
Still unsure? Call us on +44 (0) 1993 842 555.