LMK-L SERIES

THK’s LMK L SERIES Linear Bushing, specifically the flanged type Square Flange Model LMK, represents a high-performance linear motion solution engineered for demanding industrial applications. This compact, precision component features a square flange design that simplifies mounting and enhances structural rigidity, making it ideal for installations where space constraints and stability are critical. The LMK L SERIES incorporates THK’s proprietary Guide Ball Bushing technology, which utilizes a unique ball circulation system to ensure smooth, low-friction linear motion with minimal resistance and high positional accuracy. Key technical features include a hardened steel construction for exceptional durability, precision-ground raceways that optimize load distribution, and high-grade seals that effectively exclude contaminants like dust and debris while retaining lubrication. These design elements contribute to extended service life and consistent performance even in harsh operating environments.

Performance advantages of the LMK L SERIES are substantial, offering high load capacity in all directions—radial, reverse radial, and lateral—due to its optimized contact angle and ball groove geometry. This allows the bushing to handle complex load conditions without compromising smoothness or precision. The low coefficient of friction reduces energy consumption and heat generation, enabling higher operational speeds and accelerations while maintaining quiet, vibration-free motion. Its high rigidity minimizes deflection under load, ensuring repeatable positioning accuracy critical for automated processes. Additionally, the flanged square design provides secure, straightforward mounting, reducing installation time and improving overall system stability by distributing forces evenly across the mounting surface. Maintenance requirements are minimal, thanks to effective sealing and long-lasting lubrication, which help prevent premature wear and reduce downtime.

Typical applications for the THK LMK L SERIES Linear Bushing span various high-precision industries. In industrial machinery, it is commonly used in CNC machining centers for tool changers and spindle drives, where rapid, accurate linear movement is essential for productivity and part quality. Within automotive systems, these bushings are integral to robotic welding arms, assembly line conveyors, and testing equipment, providing reliable motion control that withstands continuous operation and variable loads. In precision equipment, such as semiconductor manufacturing devices, medical imaging systems, and optical positioning stages, the LMK L SERIES ensures sub-micron accuracy and smooth motion, critical for delicate processes and high-resolution outcomes. Its robust design also makes it suitable for packaging machinery, material handling systems, and automation robotics, where durability and low maintenance are paramount for operational efficiency. By delivering a combination of precision, reliability, and ease of integration, the THK LMK L SERIES flanged Linear Bushing supports advancements in automation and technology across diverse sectors.

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

dr
Tolerance
D
Tolerance L Tolerance D1 Tolerance
mm mm mm mm mm mm mm mm N N
LMK 8L Linear Bushing
8
0–0.010
15
0–0.013
45
0–0.3
32
0–0.2
25
431
LMK 10L Linear Bushing
10
0–0.010
19
0–0.016
55
0–0.3
39
0–0.2
30
588
LMK 12L Linear Bushing
12
0–0.010
21
0–0.016
57
0–0.3
42
0–0.2
32
657
LMK 13L Linear Bushing
13
0–0.010
23
0–0.016
61
0–0.3
43
0–0.2
34
814
LMK 16L Linear Bushing
16
0–0.010
28
0–0.016
70
0–0.3
48
0–0.2
37
1230
LMK 20L Linear Bushing
20
0–0.012
32
0–0.019
80
0–0.3
54
0–0.2
42
1400
LMK 25L Linear Bushing
25
0–0.012
40
0–0.019
112
0–0.4
62
0–0.2
50
1560
LMK 30L Linear Bushing
30
0–0.012
45
0–0.019
123
0–0.4
74
0–0.2
58
2490
LMK 35L Linear Bushing
35
0–0.015
52
0–0.022
135
0–0.4
82
0–0.2
64
2650
LMK 40L Linear Bushing
40
0–0.015
60
0–0.022
154
0–0.4
96
0–0.3
75
3430
LMK 50L Linear Bushing
50
0–0.015
80
0–0.022
192
0–0.4
116
0–0.3
92
6080
LMK 60L Linear Bushing
60
0–0.020
90
0–0.025
211
0–0.4
134
0–0.3
106
7650
LMK 6L Linear Bushing
6
0–0.010
12
0–0.013
35
0–0.3
28
0–0.2
22
324