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SCS/AJ-UU Series Standard / Adjustable Slide Unit

Home · Products · Linear Motion Slide Units · SCS/AJ-UU Series Standard / Adjustable Slide Unit
  • SCS/AJ-UU Series Standard / Adjustable Slide Unit
  • SCS/AJ-UU Series Standard / Adjustable Slide Unit
SCS/AJ-UU Series Standard / Adjustable Slide Unit

SCS/AJ-UU Series Standard / Adjustable Slide Unit

The SCS/AJ-UU series is a group of modular, enclosed ball slide units, encompassing two main functional types:
SCS-UU series: Standard fixed-type enclosed units. Pre-assembled and adjusted at the factory, providing users with a ready-to-use, high-precision linear motion solution.
AJ-UU series: Adjustable-clearance enclosed units. Based on the standard unit, a unique axial clearance adjustment mechanism is added, allowing users to fine-tune the fit between the internal guide rails and sliders after installation to achieve zero clearance or slight pre-tension, thus obtaining higher system rigidity and motion accuracy.

Inquiry
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Technology

Core Features and Advantages Comparison

Feature Dimensions SCS-UU Series (Standard Fixed Type) AJ-UU Series (Adjustable Clearance) Core Values and Selection Guide
Core Positioning A versatile, reliable, and ready-to-use standard modular solution. An adjustable, high-rigidity, precision-engineered solution suitable for clearance-sensitive applications. For standard high-precision applications, select the SCS series; for applications requiring backlash elimination, shock resistance or extended service life, select the AJ series.
Core Structure and Functionality Integrated fixed structure. The internal guide rails and sliders are precision-assembled and pre-adjusted at the factory, with fixed clearances. Integrated adjustment screw. By turning the adjustment screw on the side of the unit, the internal wedge block is moved to fine-tune the axial clearance of the ball slide. The AJ series offers ‘secondary precision assurance’, compensating for increased clearance caused by minor unevenness in the mounting surface or long-term wear.
Ease of Installation Extremely high. As a pre-assembled standard unit, installation requires only securing the unit itself, with no adjustments necessary. High. Installation procedures are the same as for the SCS series; simple clearance adjustment can be carried out as required after installation. Both series significantly simplify on-site assembly; the AJ series requires just one additional adjustment step, yet delivers enhanced performance.
System Rigidity High. Factory pre-tensioning ensures excellent rigidity. Adjustable to a higher level. Gap elimination through adjustment ensures high rigidity and zero backlash under bidirectional loading. In applications involving frequent forward and reverse rotation, impact loads, or requiring extremely high positioning response, the AJ’s zero-backlash advantage is evident.
Operational Accuracy High. Provides stable, high-precision motion. Higher and long-lasting. The adjustable feature enables the system to maintain optimal fit over the long term, counteracting precision degradation caused by wear. The AJ series is the ideal choice for achieving and maintaining micron-level repeatability over the long term.
Application Scenarios The vast majority of automated equipment, measuring instruments and precision feeding mechanisms. CNC machine tool tool setters, laser cutting head focusing axes, precision press-fitting equipment, high-rigidity inspection platforms. The AJ series is particularly well-suited for use as the “critical precision shaft” within machinery.

Technical Details: Adjustment Principle and Operation of the AJ Series
1. Adjustment Mechanism:
The AJ-UU unit has dedicated adjustment screw holes on the side.
Turning the adjustment screw pushes an internal precision wedge block.
The movement of the wedge block uniformly changes the interference fit of the ball slide pair, thereby achieving fine adjustment of the axial clearance (typically within tens of micrometers).
2. Adjustment Operation:
Use the provided Allen wrench to rotate the adjustment screw.
Clockwise rotation usually tightens (reduces clearance, increases pre-tension).
Counterclockwise rotation loosens (increases clearance).
Adjust until the movement feels smooth and there is no radial wobble, avoiding over-tightening which can lead to excessive resistance and increased wear.

Applications
SCS-UU series (standard type): General industrial automation modules, packaging machinery, 3D printers, general laboratory slides – suitable for most applications requiring precise linear motion but with relatively stable loads.
AJ-UU series (adjustable type): Z-axis of pick-and-place heads in semiconductor packaging equipment, focusing axis of precision vision inspection systems, lifting mechanisms of high-end dispensing valves, machine tool accessories – suitable for any "critical motion axis" where clearance can lead to reduced accuracy, vibration, or affect process quality.

The SCS/AJ-UU series standard/adjustable slide units together form a continuous product spectrum ranging from standardized, convenient applications to customizable, high-performance solutions.
By choosing the SCS series, you get a proven, ready-to-use, high-performance standard product that solves precision guidance problems in the most convenient way. By choosing the AJ series, you gain the additional capability of "active control of motion precision" on top of the standard features. This is a "safety" and "optimization" function for high-end applications, providing robust assurance for the long-term stability and ultimate performance of your equipment at a minimal incremental cost.
Our value lies in providing you with clear choices, ensuring that every investment precisely matches your equipment's needs. Whether you prioritize ultimate installation efficiency (SCS) or exceptional motion quality and long-term precision (AJ), you will find the answer here.

Parameters

Model No. Main dimensions and Mounting dimensions (mm) Basic Load Rating Weight
kg
h D L W H G A E B C S1×e S2 dyn.c stat.c0
SC6S-UU SC6S-AJ-UU 9 15 25 30 18 15 6 5 20 15 M4×8 3.4 206 265 0.034
SC8S-UU SC8S-AJ-UU 11  17  30  34  22  18  6  5  24  18  M4×8 3.4  274  392  0.052 
SC10S-UU SC10S-AJ-UU 13  20  35  40  26  21  8  6  28  21  M5×12 4.3  372  549  0.092 
SC12S-UU SC12S-AJ-UU 15  21  36  42  28  24  8  5.75  30.5  26  M5×12 4.3  510  784  0.102 
SC13S-UU SC13S-AJ-UU 15  22  39  44  30  24.5  8  5.5  33  26  M5×12 4.3  510  784  0.12 
SC16S-UU SC16S-AJ-UU 19  25  44  50  38.5  32.5  9  7  36  34  M5×12 4.3  774  1180  0.2 
SC20S-UU SC20S-AJ-UU 21  27  50  54  41  35  11  7  40  40  M6×12 5.2  882  1370  0.255 
SC25S-UU SC25S-AJ-UU 26  38  67  76  51.5  42  12  11  54  50  M8×18 7  980  1570  0.6 
SC30S-UU SC30S-AJ-UU 30  39  72  78  59.5  49  15  10  58  58  M8×18 7  1574  2740  0.735 
SC35S-UU SC35S-AJ-UU 34  45  80  90  68  54  18  10  70  60  M8×18 7  1670  3140  1.1 
SC40S-UU SC40S-AJ-UU 40  51  90  102  78  62  20  11  80  60  M10×25 8.7  2160  4020  1.59 
SC50S-UU SC50S-AJ-UU 52  61  110  122  102  80  25  11  100  80  M10×25 8.7  3820  7940  3.34 
SC60S-UU SC60S-AJ-UU 58  66  122  132  114  94  30  12  108  90  M12×25 10.7  6500  13000  4.27 

Drawings

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