Cast-iron housing units serve as elements of the so called bearing units. These units are formed together
with all kinds of insert ball bearings. Housing units can be divided into three types: P, F and T. P-type
housings have fixing bores pointing out at right angle to the shaft axis, and they are commonly called
“standing” housing units, whereas in the PA-version bores are made in the housing itself and in the Atype they are located in the housing’s flanges. The fixing bores of F-type housing units are arranged
parallel to the shaft axis. Square-shaped F-type has four bores, FL-type shaped as an extended ellipse
has two fixing bores and the circular FC-type housing unit has four fixing bores. The most specific features
has the T-type housing unit, called a tension-fixing housing. T-shape and the ability of adjusting the tension
through a special fixing are the most distinguishing features of this housing unit. All housings are made
of modified green cast iron and equipped with a valve delivering grease, whereas one shall pay special
attention to the proper placement of the lubricating groove and bore in the mounted bearing. The
designation structure of bearing units’ symbols the system of creating designations for ready-to-use
bearing units bases on the rule of combining the symbols of individual parts of the housing unit and
bearing itself. CRAFT bearings housings can be filled with 2 types of insert bearing UC and UK.