The REXROTH R166521320 is a high-precision, high-rigidity carbon steel ball slide manufactured by Bosch Rexroth in Germany. The R166521320 ball slide belongs to the FKS series, which is a flange-type, short, standard-height type, specifically designed for applications with limited longitudinal space.
Key Features of the R166521320 Ball Slider:
Space Optimization: A compact design specifically tailored for automated structures with limited longitudinal installation space.
High Precision and Stability: Utilizes Bosch Rexroth's patented ball inlet area design, enhancing smooth operation and significantly reducing friction fluctuations under external loads.
Two-Way Installation: The flange slider supports bolt fixing from either top or bottom, offering exceptional installation flexibility.
Excellent Interchangeability: Rexroth sliders and guideways are interchangeable, facilitating subsequent maintenance and parts replacement.
The FKS R166521320 ball bearing slider, with its flange-type, short, and standard-height structure, is primarily used in automated and precision machinery where installation space is limited, response speed is fast, lateral fixation is critical, but load-bearing capacity is moderate.
Core Application Scenarios:
Automation and Robotics: Three-axis Cartesian robots, high-speed gantry robots, cylinder/motor pushrod guides
Electronics and Semiconductor Manufacturing: PCB drilling/placement machines, chip testing and sorting machines, screen dispensing/film application machines
Packaging and Logistics Machinery: Bag making and sealing machines, labeling machines, multi-row sorting systems
Medical and Laboratory Automation: Blood/sample analyzers, medical imaging equipment
Item |
Specification |
Part Number |
R166521320 |
Ball Runner Type |
FKS |
Size |
25 |
Preload Class |
C1 |
Accuracy Class |
H |
Sealing |
SS – Standard Seal |
Ball Chain |
Without Ball Chain |
Guide Block Width [mm] |
70 |
Guide Block Length [mm] |
67.0 |
Guide Block Height [mm] |
29.90 |
Guide Block Height with Rail [mm] |
36 |
Mass [kg] |
0.50 |
Rated Dynamic Load [N] |
19800 |
Rated Static Load [N] |
21200 |
Rated Dynamic Torque Load [Nm] |
280 |
Rated Static Torque Load [Nm] |
300 |

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