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Linear Bushing LMK Type (Flange Type, Square Shape)
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- Volume Discount
A linear bushing with a low center height that enables a compact design.
[Features]
· Achieves linear motion with minimal frictional resistance, providing high accuracy and smooth movement.
· This type has four flat locations on the flange of the round flange LMF type.
· Compared to the round flange type, it has a lower center height, enabling a more compact design.
Part Number
Configured Part Number is shown.
Drawing
Specifications Table
| Part number Standard type | Ball List | Main dimensions | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inscribed circle diameter | Outer diameter | Length | Flange diameter | K | H | PCD | Mounting hole d1 x d2 x h | ||||||
| dr | Tolerance | D | Tolerance | L | Tolerance | D1 | Tolerance | ||||||
| LMK 6 | 4 | 6 | 0 -0.009 | 12 | 0 -0.011 | 19 | 0 -0.2 | 28 | 0 -0.2 | 22 | 5 | 20 | 3.4 x 6.5 x 3.3 |
| LMK 8S | 4 | 8 | 15 | 17 | 32 | 25 | 5 | 24 | 3.4 x 6.5 x 3.3 | ||||
| LMK 8 | 4 | 8 | 15 | 24 | 32 | 25 | 5 | 24 | 3.4 x 6.5 x 3.3 | ||||
| LMK 10 | 4 | 10 | 19 | 0 -0.013 | 29 | 39 | 30 | 6 | 29 | 4.5 x 8 x 4.4 | |||
| LMK 12 | 4 | 12 | 21 | 30 | 42 | 32 | 6 | 32 | 4.5 x 8 x 4.4 | ||||
| LMK 13 | 4 | 13 | 23 | 32 | 43 | 34 | 6 | 33 | 4.5 x 8 x 4.4 | ||||
| LMK 16 | 5 | 16 | 28 | 37 | 48 | 37 | 6 | 38 | 4.5 x 8 x 4.4 | ||||
| LMK 20 | 5 | 20 | 0 -0.010 | 32 | 0 -0.016 | 42 | 54 | 42 | 8 | 43 | 5.5 x 9.2 x 5.4 | ||
| LMK 25 | 6 | 25 | 40 | 59 | 0 -0.3 | 62 | 50 | 8 | 51 | 5.5 x 9.2 x 5.4 | |||
| LMK 30 | 6 | 30 | 45 | 64 | 74 | 58 | 10 | 60 | 6.6 x 11 x 6.5 | ||||
| LMK 35 | 6 | 35 | 0 -0.012 | 52 | 0 -0.019 | 70 | 82 | 64 | 10 | 67 | 6.6 x 11 x 6.5 | ||
| LMK 40 | 6 | 40 | 60 | 80 | 96 | 0 -0.3 | 75 | 13 | 78 | 9 x 14 x 8.6 | |||
| LMK 50 | 6 | 50 | 80 | 100 | 116 | 92 | 13 | 98 | 9 x 14 x 8.6 | ||||
| LMK 60 | 6 | 60 | 0 -0.015 | 90 | 0 -0.022 | 110 | 134 | 106 | 18 | 112 | 11 x 17.5 x 10.8 | ||
| Part number Standard type | Flange Perpendicularity μm | Eccentricity (Maximum) μm | Radial Clearance Tolerance μm | Standard rated load | Weight g | |
|---|---|---|---|---|---|---|
| C N | C0 N | |||||
| LMK 6 | 12 | 12 | -5 | 206 | 265 | 17 |
| LMK 8S | 12 | 12 | -5 | 176 | 225 | 25 |
| LMK 8 | 12 | 12 | -5 | 265 | 402 | 26 |
| LMK 10 | 12 | 12 | -5 | 373 | 549 | 45 |
| LMK 12 | 12 | 12 | -5 | 412 | 598 | 50 |
| LMK 13 | 12 | 12 | -7 | 510 | 775 | 67 |
| LMK 16 | 12 | 12 | -7 | 775 | 1,180 | 105 |
| LMK 20 | 15 | 15 | -9 | 863 | 1,370 | 130 |
| LMK 25 | 15 | 15 | -9 | 980 | 1,570 | 270 |
| LMK 30 | 15 | 15 | -9 | 1,570 | 2,750 | 344 |
| LMK 35 | 20 | 20 | -13 | 1,670 | 3,140 | 487 |
| LMK 40 | 20 | 20 | -13 | 2,160 | 4,020 | 790 |
| LMK 50 | 20 | 20 | -13 | 3,820 | 7,940 | 1,705 |
| LMK 60 | 25 | 25 | -13 | 4,710 | 10,000 | 2,278 |
Note: Since a resin retainer is incorporated, avoid use at temperatures exceeding 80°C.
Note: If an oil hole is required, you can specify it by adding the symbol OH at the end of the part number.
Product Feature Details
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 |
|---|
| LMK16UU |
| LMK25UU |
| Part Number | Standard Unit Price | Minimum order quantity | Volume Discount | Days to Ship | RoHS | Type | Inscribed Circle Dia. dr (Ø) | Overall Length L (mm) | Flange Type | Outer Sleeve Material | Outer Dia. D (Ø) | Accuracy | Ball Recirculating Type | Motion | Types | Length | Eccentricity (µm) | Basic Load Rating: Dynamic Load (Details) (N) | Basic Load Rating: Static Load (N) | Inscribed Circle Dia. Tolerance (Negative Side) (mm) | Flange Shape | Linear Motion / Rotational Motion | Basic Rated Load, Dynamic Rating (N) | Flange Shape | The material of a ball | Trusco code |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
MYR 80.53 | 1 Piece(s) | Available | 2 Day(s) or more | 10 | Flange | 16 | 37 | Standard Flange | [Steel] Iron | 28 | High Grade | Single | Linear Motion | Flanged End Face | Standard | 12 | 775 | 1180 | -0.009 | - | - | - | Square type | Iron | - | |
MYR 124.60 | 1 Piece(s) | 4 Day(s) or more | 10 | Standard Flange | 25 | 59 | - | [Steel] Steel | 40 | - | - | - | - | - | - | - | - | - | Square Flange | Linear Bushing (Linear Motion Only) | 980 | - | Steel | 293-5155 |
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Basic Information
| Outer Sleeve Surface Treatment | No | Lubrication Type | No | Dust-proof Seal | With seal on both ends |
|---|---|---|---|---|---|
| W/ or w/o metal retainer | Not Included | Operating Temperature Min(℃) | -15 | Operating Temperature Max(℃) | 80 |
Specification/Dimensions
-
Type
-
Flange -
Standard Flange
-
-
Inscribed Circle Dia. dr(Ø)
-
Overall Length L(mm)
-
Flange Type
-
Standard Flange
-
-
Outer Sleeve Material
- Steel
- Steel
-
Outer Dia. D(Ø)
-
Accuracy
- High Grade
-
Ball Recirculating Type
- Single
-
Motion
- Linear Motion
-
Types
- Flanged End Face
-
Length
- Standard
-
Eccentricity(µm)
-
Flange Shape
- Square Flange
-
Linear Motion / Rotational Motion
- Linear Bushing (Linear Motion Only)
-
Basic Rated Load, Dynamic Rating(N)
-
Flange Shape
- Square type
-
The material of a ball
- Iron
- Steel
-
Trusco code
-
type
- LMK
-
CAD
- 2D
- 3D
Days to Ship
-
- All
- 2 Day(s) or Less
- 4 Day(s) or Less
Specify Alterations
- The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .
Additional Products in this Category
- Height-adjusting Spacers for Flanged Bushings
- Housing Units - Wide Blocks - Single / Medium
- Linear Bushing Housing Units-Wide Blocks, Double / Medium Long / Long
- Linear Bushing Housing Units-Shaft Sliding, Single / Double
- Guide Ball Bushing, LG Type
- Linear Bushing L-OH Type, Single, With Lubrication Hole
- Flanged Linear Bushings LFDC-Shaped Double Center-Positioned Round-Shaped Flanges
- Linear Bushing SBK-L Series (Double Square Flange Type)
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