ST…UUB SERIES

THK’s LM Stroke Model ST…UUB SERIES represents a sophisticated evolution in linear motion technology, engineered specifically for applications demanding precise, long-stroke movement with uncompromising reliability. These systems integrate high-precision ball screws or ball splines with a compact, rigid stroke unit, delivering exceptional performance in environments where space constraints and accuracy are critical. The ST…UUB design features a sealed structure that effectively excludes contaminants such as dust, chips, and moisture, while retaining lubrication to extend service life and reduce maintenance intervals. Key technical attributes include a high permissible load capacity, achieved through optimized rail and block geometry, and smooth motion characteristics enabled by THK’s proprietary Caged Technology, which minimizes friction and heat generation.

Performance advantages of the ST…UUB SERIES are evident in its ability to maintain positional accuracy over extended travel distances, with repeatability tolerances as tight as ±0.01 mm under controlled conditions. The series supports high-speed operation without sacrificing stability, thanks to its rigid construction and advanced sealing mechanisms that prevent performance degradation from environmental factors. Energy efficiency is enhanced through low-friction components, reducing power consumption in continuous operation scenarios. Additionally, the modular design allows for easy integration into existing machinery, with options for custom stroke lengths and mounting configurations to suit specific application requirements.

In industrial machinery, the ST…UUB SERIES is deployed in automated assembly lines, where it facilitates precise positioning of robotic arms or tooling heads during pick-and-place operations. Its robustness makes it ideal for machine tools, supporting linear axes in CNC milling and turning centers that require high thrust loads and minimal deflection. Within automotive systems, these components are critical in welding robots, ensuring consistent weld seam quality by maintaining accurate torch positioning over long strokes. They also serve in suspension testing equipment, simulating real-world conditions with repetitive, high-force linear motions.

Precision equipment applications leverage the ST…UUB SERIES in semiconductor manufacturing, where it enables exact wafer handling and lithography stage movements, critical for nanoscale patterning. Medical device manufacturers utilize these systems in diagnostic instruments, such as MRI or CT scanners, for smooth and precise patient table adjustments. In optical alignment apparatus, the series provides stable, vibration-free linear motion essential for lens and mirror positioning. Overall, the THK LM Stroke ST…UUB SERIES delivers a blend of durability, precision, and adaptability, making it a cornerstone solution for advanced automation and high-accuracy industries.

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Model No. Main dimensions Basic load rating
Inscribed bore diameter Outer diameter Length
dr Tolerance D Tolerance L Tolerance Dynamic
rating
C
Static
rating
C0
mm mm mm mm mm mm kN kN
ST 30UUB LM Stroke
30
0.033
45
0
65
0
18.7
8.14
ST 35UUB LM Stroke
35
0.041
52
0
70
0
18.7
9.02
ST 40UUB LM Stroke
40
0.041
60
0
80
0
25
12.4
ST 45UUB LM Stroke
45
0.041
65
0
80
0
25.2
13.5
ST 50UUB LM Stroke
50
0.041
72
0
100
0
32.5
17.7
ST 55UUB LM Stroke
55
0.049
80
0
100
0
33
19.3
ST 60UUB LM Stroke
60
0.049
85
0
100
0
33.6
21
ST 70UUB LM Stroke
70
0.049
95
0
100
0
33.8
23.3
ST 80UUB LM Stroke
80
0.049
110
0
100
0
42.5
30.6
ST 90UUB LM Stroke
90
0.058
120
0
100
0
43.3
33.7
ST 100UUB LM Stroke
100
0.058
130
0
100
0
43.9
36.8
ST 20UUB LM Stroke
20
0.033
32
0
45
0
8.33
3.24
ST 25UUB LM Stroke
25
0.033
37
0
45
0
8.14
3.63