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LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing

Home · Products · Linear Bearing · LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing
  • LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing
  • LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing
  • LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing
LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing

LM-UU/LM-AJ-UU/LM-OP-UU Linear Bearing

The LM series is a widely used and classic standard linear bushing bearing in the field of linear motion. It defines industry-standard interface dimensions and, with its extremely high reliability, excellent cost-effectiveness, and unparalleled versatility, has become the preferred basic component for linear guidance in applications ranging from light industrial automation to precision instruments. This series offers three designs: fixed, adjustable, and open, to meet different needs from simple support to precise anti-loosening.

Inquiry
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Technology

Core Sub-series Comparison and Selection Guide

Product Features LM-UU (Standard Type) LM-AJ-UU (Adjustable Clearance Type) LM-OP-UU (Open Type) Core Selection Logic
Core Positioning An economical, versatile and maintenance-free global standard solution. A precision, zero-backlash, long-life enhanced standard solution. A specialised standard solution offering anti-rotation, anti-loosening and high tolerance. Choose UU for basic guidance; choose AJ for high precision; choose OP to address vibration and mounting issues.
Structure and Function A one-piece cylindrical bushing. Sealed at both ends (UU), this is the most basic and commonly used type. Features an integrated axial adjustment screw. Adjustment eliminates internal raceway clearance to achieve zero-backlash preload. The outer sleeve features an axial slit. By tightening the locking screw, the outer diameter is reduced, eliminating clearance with the mounting hole and preventing rotation. AJ optimises internal motion precision, whilst OP optimises external mounting reliability.
Key Benefits 1. Excellent value for money;
2. Widely available worldwide;
3. Simple to install.		 1. Achieves high rigidity and backlash-free motion;
2. Compensates for wear and restores precision;
3. Significantly improves motion smoothness and positioning accuracy.		 1. Effectively prevents the bushing from rotating within the hole;
2. Allows for mounting holes with larger tolerances, reducing machining costs and complexity;
3. Excellent vibration resistance.		 The LM-UU is the ‘foundation’, the LM-AJ/UU is the ‘precision engineering’, and the LM-OP-UU is the ‘securing solution’.
Installation Requirements Requires a high degree of precision in the mounting bore (H7 grade is generally recommended) to ensure a precise fit. Mounting hole accuracy requirements are the same as for LM-UU; fine adjustment is possible after installation. Requires only loose tolerances for the mounting bore (even through-holes may be used); relies on clamping force for fixation, offering high tolerance. When high-precision mounting holes cannot be guaranteed, the OP series is the optimal choice.
Rigidity Performance Generally, this depends on the fit tolerance. High rigidity, adjustable to zero backlash, with consistent rigidity in both directions. High radial clamping provides additional support, resulting in outstanding torsional rigidity. In applications involving cantilevered loads or vibration, the rigidity advantages of the AJ and OP series are evident.
Typical Applications Printers, photocopiers, light-duty conveyor equipment, furniture runners, educational models. Sliding components of measuring instruments, small CNC tables, and automated inspection probe mechanisms. Agricultural machinery, construction machinery guidance systems, long-stroke multi-support structures, and vibrating screening equipment. Application scenarios demonstrate their ability to resolve core issues.

General Technical Parameters and Industry Standards
1. Standards and Compatibility:
The LM series conforms to JIS (Japanese Industrial Standards) and ISO (International Organization for Standardization) dimensions. Its outer diameter (D) and length (L) are fully interchangeable with mainstream global brands (such as INA and THK's equivalent models), ensuring unparalleled versatility.
2. Materials and Construction:
Outer cylinder: High-carbon chromium bearing steel (SUJ2), surface hardened for wear resistance.
Retainer: Standard models mostly use engineering plastics, but steel retainers (LM..SC type) are also available to meet high-speed requirements.
Sealing: Contact-type rubber seals (UU) are standard on both ends, effectively preventing dust ingress.
3. Accuracy Grade: Usually available in standard grade (ABEC-1/P0) and precision grade (ABEC-3/P5).

Applications
LM-UU: The choice for most light-duty, low-cost automation projects and consumer products, with the largest market demand.
LM-AJ-UU: Widely used in applications requiring fine adjustment and long-term precision maintenance, such as optical instruments and precision fixtures.
LM-OP-UU: Designed specifically for harsh environments with impact and vibration, such as outdoor equipment, construction machinery, and agricultural machinery, providing reliable anti-loosening protection.

The LM series linear bushing bearings, with their minimalist design, exceptional reliability, and globally universal standards, have undergone decades of market testing and remain an unshakeable cornerstone in the field of linear motion.
Choosing LM-UU means choosing reliability and ultimate cost-effectiveness proven by billions of applications worldwide.
Choosing LM-AJ-UU means obtaining precision performance close to rolling guides on a standard platform at a lower cost. By choosing LM-OP-UU, you are using a clever standard component to solve common installation and loosening problems in mechanical design.

Parameters

Nominal shaft diameter (Inch/mm) Part Number dr
LM Ball circuit weight(g) LM-AJ ball circuit weight(g) LM-OP Ball circuit weight(g) mm Tolerance(μm)
Precision High
3 LM3-UU 4 1.35 - - - - - - 3 0-5 0-8
4 LM4-UU 4 1.9 - - - - - - 4 0-5 0-8
5 LM5-UU 4 4 - - - - - - 5 0-5 0-8
6 LM6-UU 4 7.6 - - - - - - 6 0-6 0-9
8 LM8S-UU 4 10.4 - - - - - - 8 0-6 0-9
8 LM8-UU 4 15 - - - - - - 8 0-6 0-9
10 LM10-UU 4 29.5 LM10-AJ-UU 4 29 LM10-OP-UU 3 23 10 0-6 0-9
12 LM12-UU 4 31.5 LM12-AJ-UU 4 31 LM12-OP-UU 3 25 12 0-6 0-9
13 LM13-UU 4 43 LM13-AJ-UU 4 42 LM13-OP-UU 3 34 13 0-6 0-9
16 LM16-UU 4 69 LM16-AJ-UU 4 68 LM16-OP-UU 3 52 16 0-6 0-9
20 LM20-UU 5 87 LM20-AJ-UU 5 85 LM20-OP-UU 4 69 20 0-7 0-10
25 LM25-UU 6 220 LM25-AJ-UU 6 216 LM25-OP-UU 5 188 25 0-7 0-10
30 LM30-UU 6 250 LM30-AJ-UU 6 245 LM30-OP-UU 5 210 30 0-7 0-10
35 LM35-UU 6 390 LM35-AJ-UU 6 384 LM35-OP-UU 5 335 35 0-8 0-12
40 LM40-UU 6 585 LM40-AJ-UU 6 579 LM40-OP-UU 5 500 40 0-8 0-12
50 LM50-UU 6 1580 LM50-AJ-UU 6 1560 LM50-OP-UU 5 1340 50 0-8 0-12
60 LM60-UU 6 1860 LM60-AJ-UU 6 1820 LM60-OP-UU 5 1610 60 0-9 0-15
80 LM80-UU 6 4420 LM80-AJ-UU 6 4300 LM80-OP-UU 5 3650 80 0-9 0-15
100 LM100-UU 6 8600 LM100-AJ-UU 6 8540 LM100-OP-UU 5 7200 100 0-10 0-20
120 LM120-UU 8 15000 LM120-AJ-UU 8 14900 LM120-OP-UU 6 11600 120 0-10 0-20
150 LM150-UU 8 20250 LM150-AJ-UU 8 20150 LM150-OP-UU 6 15700 150 0-13 0-25

Major dimensions and tolerance θ Eccentrcity Radial
clearan-
ce(Max)
μm		 Basic load rating Nominal
shaft
diameter
(mm)
D L B W D1 h h1 Precision(μm) High(μm) dynamic
(CN)		 static
(Co N)
mm Tolerance(μm) mm Tolerance(μm) mm Tolerance(μm) mm mm mm mm
7 0-9 10 0-120 - - - - - - - 4 8 -3 69 105 3
8 0-9 12 0-120 - - - - - - - 4 8 -3 88 127 4
10 0-9 15 0-120 10.2 0-200 1.1 9.6 - - - 4 8 -3 167 206 5
12 0-11 19 0-200 13.5 0-200 1.1 11.5 - - - 8 12 -3 206 265 6
15 0-11 17 0-200 11.5 0-200 1.1 14.3 - - - 8 12 -3 176 216 8
15 0-11 24 0-200 17.5 0-200 1.1 14.3 - - - 8 12 -3 274 392 8
19 0-13 29 0-200 22 0-200 1.3 18 1 6.8 80° 8 12 -4 372 549 10
21 0-13 30 0-200 23 0-200 1.3 20 1.5 8 80° 8 12 -4 510 784 12
23 0-13 32 0-200 23 0-200 1.3 22 1.5 9 80° 8 12 -4 510 784 13
28 0-13 37 0-200 26.5 0-200 1.6 27 1.5 11 80° 8 12 -6 774 1180 16
32 0-16 42 0-200 30.5 0-200 1.6 30.5 1.5 11 60° 10 15 -6 882 1370 20
40 0-16 59 0-300 41 0-300 1.85 38 2 12 50° 10 15 -6 980 1570 25
45 0-16 64 0-300 44.5 0-300 1.85 43 2.5 15 50° 10 15 -8 1570 2740 30
52 0-19 70 0-300 49.5 0-300 2.1 49 2.5 17 50° 12 20 -8 1670 3140 35
60 0-19 80 0-300 60.5 0-300 2.1 57 3 20 50° 12 20 -10 2160 4020 40
80 0-19 100 0-300 74 0-300 2.6 76.5 3 25 50° 12 20 -13 3820 7940 50
90 0-22 110 0-300 85 0-300 3.15 86.5 3 30 50° 17 25 -13 4700 10000 60
120 0-22 140 0-400 105.5 0-400 4.15 116 3 40 50° 17 25 -20 7350 16000 80
150 0-25 175 0-400 125.5 0-400 4.15 145 3 50 50° 20 30 -20 14100 34800 100
180 0-25 200 0-400 158.5 0-400 4.15 175 3 85 80° 20 30 -25 16400 40000 120
210 0-29 240 0-400 170.6 0-400 5.15 204 3 105 80° 25 40 -25 21100 54300 150

Drawings

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