Precision Ball Bearings At PM we are specialized in many kind of bearings. Starting with the production of linear bearings in 1966 we are also known as manufacturer of single row precision ball bearings in miniature (with a OD of just 2.5mm and bore size 0.6mm), small and normal size. Our company logo shows both bearing systems, linear and radial. Many of our bearings can be supplied as open bearing but can also be delivered with a metal shield or teflon seals and with different lubricants. Precision classes are of course avialable according to ISO and ABMA ABEC standard. Our sophisticated flexible production system allows us to not only cater to custom designs, but also to produce big quantities punctually and in a high level of precision.