PSF - Profiled rail guide and PSS - Profil rail carrriage 

ARC = compact design
HRC/ERC = tall design

Carriage width: F-flange design | M-block design
Carriage  lenght; S-short design | N-normal design | L-long design
FS = Flange, short design
FN = Flange, normal design 
FL = Flange, long design
MS = Bblock design, short design 
MN = Block design, normal design
ML =  Block design, long design

Linear guides are designed with four raceways in O - arrangement. The precision steel balls transmit introduced forces at a contact angle of 45 degrees (see following sketch). In comparison to the X-arrangement, the O-arrangement gives a higher torsional rigidity.

To achieve an optimum at load capacity and stiffness the maximum number of steel balls were used, despite the limited space. As a result, high static and dynamic torque loads are possible. The same load ratings apply to all load directions with a compact design