PM Bearings and The Precision Alliance introduce the FMB Series of low profile, high precision rotary bearings, suitable for rotary positioning systems where precision and height are critical. The various bearings sizes are only 8.5 to 12.5 mm tall and deliver radial and axial run-out from 10 microns down to 1 micron. According to a press release, the FMB is constructed of high quality bearing steels, PTFE- filled, plastic ball cage and super precision steel balls. The specially designed raceways increase load capacity and stiffness while guaranteeing high precision, long life, and a low coefficient of friction. There are nine standard sizes with outside diameters ranging from 120 mm to 350 mm and inside diameters ranging from 40 to 250 mm. Each size has different precision grades and preload classes. Additionally, for OEM applications custom sizes are available up to 500mm OD to exactly match the application. The FMB includes a 0.5mm offset between the inner and outer races and counter bored holes to enable mounting directly onto flat surfaces. FMB flat mounted bearings are manufactured in two quality grades (N)ormal and (P)recision grade and are supplied by default with zero clearance. FMB bearings are also supplied in two preload classes V0 (0.02C)) and V1 (0.08C). V0: For very smooth, almost friction-free operation V1: The location requires high rigidity and is subjected to vibration or large overhung loads.