LM-GA-AJ SERIES

THK’s LM LM GA AJ SERIES Linear Bushing Cylindrical (Standard) represents a fundamental advancement in linear motion technology, engineered to deliver exceptional precision, reliability, and durability in demanding industrial environments. This series features a cylindrical housing design with a standardized outer diameter, ensuring seamless integration into a wide array of machinery and equipment. Constructed from high-carbon chromium bearing steel, the bushings undergo rigorous heat treatment processes to achieve superior hardness and wear resistance, significantly extending service life even under high-load conditions. The incorporation of THK’s proprietary Guide Ball technology ensures smooth, low-friction motion by maintaining precise ball circulation paths, which minimizes vibration and noise during operation.

Key technical features include optimized groove geometry and precision-ground raceways that facilitate consistent load distribution across all contact points, enhancing both static and dynamic load capacities. The LM LM GA AJ SERIES is designed with a compact, lightweight structure, allowing for space-saving installations without compromising performance. Its corrosion-resistant surface treatment options, such as phosphate coating or black oxide, provide added protection in harsh environments, including those exposed to moisture, chemicals, or extreme temperatures. Additionally, the series supports high-speed applications due to its efficient ball retainer system, which prevents ball-to-ball contact and reduces heat generation, ensuring stable performance over prolonged periods.

Performance advantages of this linear bushing series are evident in its ability to maintain precise linear guidance with minimal maintenance requirements. The low coefficient of friction translates to reduced energy consumption and higher operational efficiency, while the high rigidity design minimizes deflection under heavy loads, ensuring accuracy in repetitive motions. These attributes make the LM LM GA AJ SERIES ideal for applications where precision, reliability, and longevity are critical. In industrial machinery, it is commonly employed in automated assembly lines, CNC machine tools, and material handling systems, where it facilitates smooth linear movement in slides, actuators, and positioning tables. Within automotive systems, these bushings are integral to robotics for welding and painting operations, engine component testing equipment, and transmission assembly lines, providing consistent performance under high-cycle conditions. In precision equipment, such as semiconductor manufacturing devices, medical imaging systems, and optical instrument stages, the series ensures sub-micron level accuracy and vibration-free operation, crucial for maintaining product quality and process integrity. By combining robust construction with advanced engineering, THK’s LM LM GA AJ SERIES continues to set the standard for linear motion components across diverse sectors.

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Model No. Main dimensions Basic load rating
Inscribed bore diameter Outer diameter Length Dynamic rating
C
Static rating
C0

dr
Tolerance
D
Tolerance
Precision/High
L Tolerance
Precision High
mm mm mm mm mm mm mm N N
LM 38GA-AJ Linear Bushing
38
0–0.008
0–0.012
57
0–0.019
76
0–0.3
2160
4020
LM 40GA-AJ Linear Bushing
40
0–0.008
0–0.012
60
0–0.019
80
0–0.3
2160
4020
LM 50GA-AJ Linear Bushing
50
0–0.008
0–0.012
80
0–0.022
100
0–0.3
3820
7940
LM 60GA-AJ Linear Bushing
60
0–0.009
0–0.015
90
0–0.022
110
0–0.3
4710
10000
LM 80GA-AJ Linear Bushing
80
0–0.009
0–0.015
120
0–0.022
140
0–0.4
7350
16000
LM 100GA-AJ Linear Bushing
100
0–0.010
0–0.020
150
0–0.025
175
0–0.4
14100
34800
LM 120A-AJ Linear Bushing
120
0–0.010
0–0.020
180
0–0.025
200
0–0.4
16400
40000
LM 12GA-AJ Linear Bushing
12
0–0.006
0–0.009
21
0–0.013
30
0–0.2
412
598
LM 13GA-AJ Linear Bushing
13
0–0.006
0–0.009
23
0–0.013
32
0–0.2
510
775
LM 16GA-AJ Linear Bushing
16
0–0.006
0–0.009
28
0–0.013
37
0–0.2
775
1180
LM 20GA-AJ Linear Bushing
20
0–0.007
0–0.010
32
0–0.016
42
0–0.2
863
1370
LM 25GA-AJ Linear Bushing
25
0–0.007
0–0.010
40
0–0.016
59
0–0.3
980
1570
LM 30GA-AJ Linear Bushing
30
0–0.007
0–0.010
45
0–0.016
64
0–0.3
1570
2750
LM 35GA-AJ Linear Bushing
35
0–0.008
0–0.012
52
0–0.019
70
0–0.3
1670
3140