LMK SERIES

THK’s LMK SERIES flanged-type Square Flange Model LMK Linear Bushings represent a significant advancement in linear motion technology, engineered to deliver exceptional precision, durability, and load-bearing capacity in demanding industrial environments. These compact, high-performance components are designed with a square flange configuration that simplifies mounting and enhances structural rigidity, making them ideal for applications where space constraints and alignment accuracy are critical. The LMK SERIES incorporates THK’s proprietary Guide Ball Bushing technology, which features a unique ball circulation system that minimizes friction and ensures smooth, consistent motion even under high loads and rapid cycling conditions.

Key technical features of the LMK Linear Bushings include their optimized contact angle design, which distributes loads evenly across the ball grooves to maximize rigidity and minimize deformation under stress. The flanged construction provides secure attachment points, reducing the need for additional mounting hardware and streamlining integration into machine designs. Manufactured from high-grade chromium steel and subjected to THK’s rigorous heat treatment processes, these bushings offer superior wear resistance and extended service life. The inclusion of seals and wipers effectively prevents contamination from dust, chips, and other particulates, maintaining lubrication integrity and operational reliability in harsh environments.

Performance advantages of the LMK SERIES are evident in their ability to support high moment loads while maintaining precise linear guidance with minimal maintenance requirements. The low coefficient of friction inherent in the Guide Ball Bushing design translates to reduced energy consumption and heat generation, contributing to overall system efficiency. Their compact dimensions allow for space-saving installations without compromising on load capacity or accuracy, making them particularly suitable for modern machinery designs that prioritize footprint reduction.

Typical applications for the LMK flanged-type Linear Bushings span across multiple industries, including industrial automation where they are deployed in CNC machining centers, robotic positioning systems, and material handling equipment. In automotive manufacturing, these components are integral to assembly line robots, precision welding fixtures, and testing apparatus that demand repeatable accuracy under continuous operation. The precision equipment sector utilizes LMK bushings in semiconductor fabrication tools, optical alignment systems, and medical device manufacturing where sub-micron level precision is non-negotiable. Their robust construction and contamination resistance also make them well-suited for food processing machinery, packaging systems, and other applications requiring frequent washdowns or exposure to corrosive agents.

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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 6 Linear Bushing
6
0–0.009
12
0–0.011
19
0–0.2
28
0–0.2
22
206
LMK 8S Linear Bushing
8
0–0.009
15
0–0.011
17
0–0.2
32
0–0.2
25
176
LMK 8 Linear Bushing
8
0–0.009
15
0–0.011
24
0–0.2
32
0–0.2
25
265
LMK 10 Linear Bushing
10
0–0.009
19
0–0.013
29
0–0.2
39
0–0.2
30
373
LMK 12 Linear Bushing
12
0–0.009
21
0–0.013
30
0–0.2
42
0–0.2
32
412
LMK 13 Linear Bushing
13
0–0.009
23
0–0.013
32
0–0.2
43
0–0.2
34
510
LMK 16 Linear Bushing
16
0–0.009
28
0–0.013
37
0–0.2
48
0–0.2
37
775
LMK 20 Linear Bushing
20
0–0.010
32
0–0.016
42
0–0.2
54
0–0.2
42
863
LMK 25 Linear Bushing
25
0–0.010
40
0–0.016
59
0–0.3
62
0–0.2
50
980
LMK 30 Linear Bushing
30
0–0.010
45
0–0.016
64
0–0.3
74
0–0.2
58
1570
LMK 35 Linear Bushing
35
0–0.012
52
0–0.019
70
0–0.3
82
0–0.2
64
1670
LMK 40 Linear Bushing
40
0–0.012
60
0–0.019
80
0–0.3
96
0–0.3
75
2160
LMK 50 Linear Bushing
50
0–0.012
80
0–0.019
100
0–0.3
116
0–0.3
92
3820
LMK 60 Linear Bushing
60
0–0.015
90
0–0.022
110
0–0.3
134
0–0.3
106
4710