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Linear Bushing LM Type (Part Numbers)

Linear Bushing LM Type

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This linear bushing has an outer diameter formed by a highest-precision cylinder, and is used in a wide range of applications.
Part of the milli series, the most widely used series in Japan.

(i)Caution

  • Some of the items are scheduled to be discontinued as of end of March in 2023. The manufacturer keep the items produced but they are not available with Misumi.
    There are not the replacement items and the plan to resumption of sale. Please check the quotation and order screen for details.

PDF

Drawing

Linear bushing LM type dimensional drawing

Specifications Table

Part numberBall
List
Main dimensions
Standard typeClearance adjustment typeOpen typeInscribed circle diameterOuter diameterLengthL1ToleranceL2D0h0h1θ°
drToleranceDTolerance
High Grade / Precision Grade
LTolerance
High gradePrecision Grade
LM 3--430
-0.008
0
-0.005
70
-0.009
100
-0.12
-------
LM 4--44812-------
LM 5--45101510.20
-0.2
1.19.6---
LM 6LM 6-AJ-460
-0.009
0
-0.006
120
-0.011
190
-0.2
13.51.111.51--
LM 8SLM 8S-AJ-48151711.51.114.31--
LM 8LM 8-AJ-48152417.51.114.31--
LM 10LM 10-AJ-410190
-0.013
29221.3181--
LM 12LM 12-AJ-4122130231.3201.5--
LM 13LM 13-AJLM 13-OP4132332231.3221.5980
LM 16LM 16-AJLM 16-OP516283726.51.6271.51160
LM 20LM 20-AJLM 20-OP5200
-0.010
0
-0.007
320
-0.016
4230.51.630.51.51160
LM 25LM 25-AJLM 25-OP62540590
-0.3
410
-0.3
1.853821250
LM 30LM 30-AJLM 30-OP630456444.51.85432.51550
LM 35LM 35-AJLM 35-OP6350
-0.012
0
-0.008
520
-0.019
7049.52.1492.51750
LM 40LM 40-AJLM 40-OP640608060.52.15732050
LM 50LM 50-AJLM 50-OP650800
-0.022
100742.676.532550
LM 60LM 60-AJLM 60-OP6600
-0.015
0
-0.009
90110853.1586.533050
Part numberEccentricity (maximum)
μm
Radial
Clearance
Tolerance
μm
Standard rated loadWeight
g
Standard typeClearance adjustment typeOpen typeC
N
C0
N
High gradePrecision Grade
LM 3--84-288.21081.6
LM 4--84-388.21272.2
LM 5--84-31672064
LM 6LM 6-AJ-128-52062658
LM 8SLM 8S-AJ-128-51762259.3
LM 8LM 8-AJ-128-526540213.5
LM 10LM 10-AJ-128-537354925
LM 12LM 12-AJ-128-541259828
LM 13LM 13-AJLM 13-OP128-751077538
LM 16LM 16-AJLM 16-OP128-77751,18078
LM 20LM 20-AJLM 20-OP1510-98631,37086
LM 25LM 25-AJLM 25-OP1510-99801,570210
LM 30LM 30-AJLM 30-OP1510-91,5702,750221
LM 35LM 35-AJLM 35-OP2012-131,6703,140358
LM 40LM 40-AJLM 40-OP2012-132,1604,020557
LM 50LM 50-AJLM 50-OP2012-133,8207,9401,418
LM 60LM 60-AJLM 60-OP2517-164,71010,0001,733

Note: Since a resin retainer is incorporated, avoid use at temperatures exceeding 80°C.
If the operating temperature exceeds 80°C, please use a type with a metal retainer (LM-GA type).

Linear bushing LM type part number example

The accuracy of the inscribed circle diameter, outer diameter, and eccentricity for clearance adjustment type (-AJ) and open type (-OP) refers to the values before splitting.

Note: When using a single linear bushing per shaft, avoid moment loads. Use two or more bushings per shaft, and ensure a large mounting distance between each bushing.

Product Feature Details

Linear bushing LM type Structure of linear bushing LM: UU type

Structure of Linear Bushing LM: UU Type

Linear bushings are used in combination with cylindrical LM shafts and are products that perform linear motion.
Since the load balls and LM shaft are in point contact, linear motion is achieved with minimal frictional resistance, resulting in smooth movement.
The outer housing is made of high carbon chrome bearing steel, and after heat treatment, the inner diameter and outer diameter are ground and finished.
Linear bushings are used in office equipment, medical devices, packaging machines, and other applications where there is a light load and no vibration or impact.
However, they cannot be used in applications where a load is applied in the rotating direction.

Compatibility
The linear bushing and LM shaft are compatible, allowing you to freely combine and use them as needed.

Low Noise
The standard type is equipped with a resin-molded retainer to keep the balls captive, enabling low-noise and smooth operation.

Wide Variety
A wide range of types is available, including standard type, clearance adjustment type, open type, long type, pilot flange type, and flange type LM case units, allowing you to select the most suitable model for your application.

Cautions and Prohibitions

Handling

(1) Disassembling each part may allow foreign matter to enter or reduce the assembly accuracy of each part, so do not disassemble.
(2) Do not drop or hit the linear bushing. It may cause injury or damage. In addition, please note that when shock was applied, the product may lose its function even though there is no visible damage to the external appearance.
(3) When handling the product, wear protective gloves, safety shoes, and the like as necessary to ensure safety.

Precautions for use

(1) Be careful to prevent cutting chip, coolant, or other contaminant from entering. Otherwise, it may cause damage.
(2) If the product is used in environments where cutting chip, coolant, corrosive solvents, water, etc. may enter the interior, avoid entry into the product by using bellows, cover, or similar protection.
(3) Avoid using the product at temperatures exceeding 80°C. If the temperature exceeds this level, resin and rubber parts may be deformed or damaged.
(4) If cutting chip or other contaminant adheres to the product, please clean it and then reapply lubricant.
(5) In cases of small stroke, it is difficult for an oil film to form on the contact surfaces between the rolling surface and the rolling element, which may cause fretting. Therefore, please use grease with excellent fretting resistance. Additionally, it is recommended to periodically move the stroke by approximately the length of the outer cylinder to help form an oil film on the rolling surface and rolling element.
(6) Do not forcibly drive positioning components (such as pins or keys) into the product. This may cause indentations on the rolling surfaces and result in loss of function.
(7) If the shaft is inserted at an angle, there is a possibility of contaminant ingress, damage to internal components, and the rolling element falling out.
(8) Using the product with the rolling element removed may cause early breakage.
(9) If the rolling element falls out, do not use the product as is; please contact THK.
(10) If the rigidity and accuracy of the mounting components are insufficient, the load on the bearing will be locally concentrated, and the bearing performance will be significantly reduced. Therefore, please thoroughly consider the rigidity and accuracy of the housing and base, as well as the strength of the fixing bolts.

Lubrication

(1) Wipe off the anti-rust oil thoroughly and apply lubricant before use.
(2) Avoid mixing different lubricants. Even if the thickener is the same type of grease, differences in additives and other components may have adverse effects on each other.
(3) When used in special environments such as locations subject to constant vibration, clean rooms, vacuum, or extreme low or high temperatures, please use grease suitable for the specifications and environment.
(4) When lubricating the product, apply lubricant directly to the rolling surface and perform several break-in strokes to ensure grease enters the interior.
(5) The consistency of the grease changes depending on the temperature. Please note that changes in consistency will also affect the sliding resistance of the linear bushing.
(6) After greasing, the mixing resistance of the grease may increase the sliding resistance of the linear bushing. Be sure to perform a break-in operation and allow the grease to fully spread before operating the machine.
(7) Immediately after greasing, excess grease may scatter around the area, so please wipe it off as needed before use.
(8) The properties of grease deteriorate and its lubrication performance declines over time, so it is necessary to inspect and replenish the grease according to usage frequency.
(9) Lubrication intervals vary depending on usage conditions and operating environment. Please determine the final lubrication interval and amount based on actual machine operation.

Storage

Please store the linear bushing indoors, in THK's packaging and shipping configuration, avoiding high temperatures, low temperatures, and high humidity.

Disposal

Please dispose of the product appropriately as industrial waste.

Part Number
LM3
LM3U
LM6UP
LM8UP
LM10UU-AJ
LM12UU-AJ
LM13UU-AJ
LM13UU-OP
LM16-OP
LM16UU-OP
LM16UUP
LM20-OP
LM20UU-OP
LM25-AJ
LM25-OP
LM25P
LM25UU-OP
LM30-OP
LM30UU
LM30UU-AJ
LM35
LM35P
LM35U
LM35UU
LM35UU-AJ
LM35UU-OP
LM40
LM40-AJ
LM40U
LM40UP
LM40UU
LM40UU-OP
LM40UUP
LM50
LM50UU
LM50UU-AJ
LM60
LM60U
LM60UU
Part NumberStandard Unit PriceMinimum order quantityVolume DiscountDays to ShipRoHSType Inscribed Circle Dia. dr
(Ø)
Overall Length L
(mm)
Style Outer Dia. D
(Ø)
Accuracy Types Eccentricity
(µm)
Basic Load Rating: Dynamic Load (Details)
(N)
Basic Load Rating: Static Load
(N)
Inscribed Circle Dia. Tolerance (Negative Side)
(mm)
Basic Rated Load, Dynamic Rating
(N)
Dust-proof Seal

MYR 25.02

1 Piece(s) 4 Day(s) or more 10Straight310Standard Shape7High GradeStandard888.2108-0.00888.2No

MYR 37.41

1 Piece(s)Available 5 Day(s) or more -Straight310Standard Shape7High GradeStandard888.2108-0.00888.2Single end seal

MYR 39.39

1 Piece(s)Available 12 Day(s) or more -Straight619Standard Shape12Precision GradeStandard8206265-0.006206Single end seal

MYR 40.76

1 Piece(s) 5 Day(s) or more -Straight824Standard Shape15Precision GradeStandard8265402-0.006265Single end seal

MYR 60.96

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type1029[Open Type, Clearance Adjusting Type] Clearance adjusting shape19High GradeClearance adjusting shape12373549-0.009373Both ends with adhesive

MYR 61.18

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type1230[Open Type, Clearance Adjusting Type] Clearance adjusting shape21High GradeClearance adjusting shape12412598-0.009412Both ends with adhesive

MYR 61.18

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type1332[Open Type, Clearance Adjusting Type] Clearance adjusting shape23High GradeClearance adjusting shape12510775-0.009510Both ends with adhesive

MYR 68.81

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type1332[Open Type, Clearance Adjusting Type] Open Type23High GradeOpen Type12510775-0.009510Both ends with adhesive

MYR 38.73

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type1637[Open Type, Clearance Adjusting Type] Open Type28High GradeOpen Type127751180-0.009775No

MYR 92.85

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type1637[Open Type, Clearance Adjusting Type] Open Type28High GradeOpen Type127751180-0.009775Both ends with adhesive

MYR 59.32

1 Piece(s) 12 Day(s) or more -Straight1637Standard Shape28Precision GradeStandard87751180-0.006775Both ends with adhesive

MYR 97.66

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type2042[Open Type, Clearance Adjusting Type] Open Type32High GradeOpen Type158631370-0.01863No

MYR 112.60

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type2042[Open Type, Clearance Adjusting Type] Open Type32High GradeOpen Type158631370-0.01863Both ends with adhesive

MYR 139.76

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type2559[Open Type, Clearance Adjusting Type] Clearance adjusting shape40High GradeClearance adjusting shape159801570-0.01980No

MYR 154.15

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type2559[Open Type, Clearance Adjusting Type] Open Type40High GradeOpen Type159801570-0.01980No

MYR 96.11

1 Piece(s) 5 Day(s) or more -Straight2559Standard Shape40Precision GradeStandard109801570-0.007980No

MYR 168.51

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type2559[Open Type, Clearance Adjusting Type] Open Type40High GradeOpen Type159801570-0.01980Both ends with adhesive

MYR 245.41

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type3064[Open Type, Clearance Adjusting Type] Open Type45High GradeOpen Type1515702750-0.011570No

MYR 71.93

1 Piece(s)Available 4 Day(s) or more 10Straight3064Standard Shape45High GradeStandard1515702750-0.011570Both ends with adhesive

MYR 257.49

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type3064[Open Type, Clearance Adjusting Type] Clearance adjusting shape45High GradeClearance adjusting shape1515702750-0.011570Both ends with adhesive

MYR 80.26

1 Piece(s) 4 Day(s) or more 10Straight3570Standard Shape52High GradeStandard2016703140-0.0121670No

MYR 160.04

1 Piece(s) 5 Day(s) or more -Straight3570Standard Shape52Precision GradeStandard1216703140-0.0081670No

MYR 133.32

1 Piece(s) 5 Day(s) or more 10Straight3570Standard Shape52High GradeStandard2016703140-0.0121670Single end seal

MYR 86.59

1 Piece(s) 4 Day(s) or more 10Straight3570Standard Shape52High GradeStandard2016703140-0.0121670Both ends with adhesive

MYR 298.46

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type3570[Open Type, Clearance Adjusting Type] Clearance adjusting shape52High GradeClearance adjusting shape2016703140-0.0121670Both ends with adhesive

MYR 311.38

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type3570[Open Type, Clearance Adjusting Type] Open Type52High GradeOpen Type2016703140-0.0121670Both ends with adhesive

MYR 94.85

1 Piece(s) 4 Day(s) or more 10Straight4080Standard Shape60High GradeStandard2021604020-0.0122160No

MYR 297.81

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type4080[Open Type, Clearance Adjusting Type] Clearance adjusting shape60High GradeClearance adjusting shape2021604020-0.0122160No

MYR 189.76

1 Piece(s) 5 Day(s) or more -Straight4080Standard Shape60High GradeStandard2021604020-0.0122160Single end seal

MYR 238.86

1 Piece(s) 5 Day(s) or more -Straight4080Standard Shape60Precision GradeStandard1221604020-0.0082160Single end seal

MYR 173.04

1 Piece(s)Available 2 Day(s) or more 10Straight4080Standard Shape60High GradeStandard2021604020-0.0122160Both ends with adhesive

MYR 374.71

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type4080[Open Type, Clearance Adjusting Type] Open Type60High GradeOpen Type2021604020-0.0122160Both ends with adhesive

MYR 276.27

1 Piece(s) 39 Day(s) or more 10Straight4080Standard Shape60Precision GradeStandard1221604020-0.0082160Both ends with adhesive

MYR 203.88

1 Piece(s) 4 Day(s) or more 10Straight50100Standard Shape80High GradeStandard2038207940-0.0123820No

MYR 204.13

1 Piece(s) 4 Day(s) or more 10Straight50100Standard Shape80High GradeStandard2038207940-0.0123820Both ends with adhesive

MYR 291.02

1 Piece(s) 5 Day(s) or more -Straight Open Type / Clearance Adjustment Type50100[Open Type, Clearance Adjusting Type] Clearance adjusting shape80High GradeClearance adjusting shape2038207940-0.0123820Both ends with adhesive

MYR 238.69

1 Piece(s) 5 Day(s) or more -Straight60110Standard Shape90High GradeStandard25471010000-0.0154710No

MYR 315.69

1 Piece(s) 5 Day(s) or more -Straight60110Standard Shape90High GradeStandard25471010000-0.0154710Single end seal

MYR 264.00

1 Piece(s) 4 Day(s) or more 10Straight60110Standard Shape90High GradeStandard25471010000-0.0154710Both ends with adhesive

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Basic Information

Outer Sleeve Material Steel Outer Sleeve Surface Treatment No Lubrication Type No
Ball Recirculating Type Single Motion Linear Motion Length Standard
Linear Motion / Rotational Motion Linear Bushing (Linear Motion Only) The material of a ball Iron W/ or w/o metal retainer No
Operating Temperature Max(℃) 80

Frequently asked question (FAQ)

Question: What distinguishes the Linear Bushing LM Type from other linear motion bearings?
Answer: The Linear Bushing LM Type is designed with a high-precision steel outer sleeve and a single ball recirculation path. Unlike plain bushings, it uses rolling contact through hardened steel balls, resulting in low friction and high positioning accuracy. Its design ensures uniform load distribution and smooth linear motion, even under high-speed or repetitive stroke conditions.
Question: What materials and surface treatments are used in the Linear Bushing LM Type?
Answer: The outer sleeve is made from precision-ground steel with no additional surface treatment to maintain dimensional accuracy. The rolling elements (balls) are made of high-carbon bearing steel, providing high hardness and wear resistance. This construction ensures stability and longevity under continuous linear motion applications.
Question: How does the Linear Bushing LM Type accommodate load and movement?
Answer: The Linear Bushing LM Type supports loads through a contact area formed between the balls and the shaft, distributing stress uniformly along the contact lines. It is optimized for radial loads while allowing smooth linear reciprocating motion. However, it is not intended for rotational or moment loads unless specifically supported by a guide structure.
Question: What is the operational temperature range and lubrication requirement for the Linear Bushing LM Type?
Answer: The standard operating temperature is up to 80°C. Although it can be used without lubrication, applying lithium-based grease or oil is recommended for continuous operation to reduce wear and extend service life. The open type variants allow easier maintenance and lubrication access in high-duty applications.
Question: What are the available configurations of the Linear Bushing LM Type?
Answer: This series includes multiple styles such as Standard Type, Open Type, and Clearance Adjusting Type. The open type allows shaft clearance adjustment or preloading for increased rigidity. The clearance adjusting shape ensures optimal shaft fit for precision positioning and minimal vibration during motion.
Question: How is the Linear Bushing LM Type installed and aligned for optimal performance?
Answer: Proper shaft alignment and housing tolerance are critical. The shaft surface hardness should be above HRC 58, and roughness below Ra 0.2 μm. The housing bore tolerance should follow H7 specifications, ensuring correct interference fit without distortion. Misalignment may cause uneven ball contact and reduced lifespan.
Question: What accuracy grades are available, and how do they affect performance?
Answer: The Linear Bushing LM Type is available in High Grade and Precision Grade accuracy levels. Precision grade models feature tighter dimensional tolerances and reduced radial play, providing superior repeatability for applications such as semiconductor assembly, optical inspection, or fine machining systems.

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