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  3. THK LMK30LUU

THK LMK30LUU Linear Bearing Od Flange 30MM 45MM 123MM

Lmk30luu Thk Linear Bearing 30mm Bore 45mm Od 123mm Rectangular Flange

( Brand: Thk ), ( Manufacturer Part Number: LMK30LUU ), ( Shelf: K-65 ), ( Type: Linear Bearing ), ( Country Of Origin: Japan ), ( Inside Diameter: 30 Mm ), ( Outside Diameter: 45 Mm )

Review THK Linear Bearing 30mm Bore 45mm Od 123mm Rectangular Flange

The **LMK30LUU linear bearing** is a high-performance, precision-engineered component designed for demanding applications requiring smooth, low-friction motion in both linear and rotary movements. With an outer diameter (OD) of **45mm** and a robust **30mm inner diameter**, this bearing is built to handle axial loads with exceptional stability while maintaining minimal wear over extended operational cycles. The **123mm flange** provides a substantial mounting surface, ensuring secure integration into machinery, frames, or custom fixtures, and its reinforced structure distributes loads evenly to prevent deformation or misalignment. Constructed from high-quality **chrome steel** and featuring a **hardened raceway** with a **low-friction polymer or composite cage**, this bearing delivers consistent performance under heavy loads, high-speed applications, or environments with moderate contamination. Its **sealed design** minimizes the ingress of dust, debris, or moisture, making it suitable for both indoor and outdoor use in industries such as robotics, CNC machining, automated assembly lines, or medical equipment where precision and reliability are critical. The LMK30LUU s **precisely machined surfaces** and **tight tolerances** ensure smooth operation with reduced vibration, while its **universal compatibility** with standard shafts and mounting hardware simplifies installation. Whether used in linear slides, rotary tables, or indexing systems, this bearing exemplifies durability, efficiency, and long-term dependability, making it an ideal choice for engineers and designers seeking a balance between performance and cost-effectiveness.

The LMK30LUU linear bearing is a popular choice for applications requiring smooth, low-friction linear motion. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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**Pros:**

1. **High Load Capacity:** The 30mm x 45mm (OD) design provides a robust load-bearing surface, making it suitable for applications with moderate to high axial and radial loads. The 123mm flange length ensures stability, reducing deflection under load.

2. **Low Friction:** The recirculating ball design minimizes friction, resulting in energy-efficient motion and reduced wear over time. This is ideal for applications where smooth operation is critical, such as CNC machines, 3D printers, or automated assembly lines.

3. **Precision and Accuracy:** LM bearings are known for their high precision, with tight tolerances that ensure consistent performance. The LMK series is particularly designed for applications requiring repeatable positioning, such as in robotics or precision machining.

4. **Durability:** The hardened steel raceways and recirculating balls are resistant to wear, extending the bearing s lifespan, especially when paired with proper lubrication. The sealed design in some variants (like the LMK30LUU) helps protect against contaminants.

5. **Compatibility:** The bearing is compatible with standard linear rails (e.g., LM30UU rails) and can be easily integrated into existing systems. The flange design allows for secure mounting to surfaces like aluminum extrusions or custom frames.

6. **Wide Availability:** As a common industrial component, the LMK30LUU is widely stocked by suppliers, making it easy to source and replace if needed. Accessories like end caps, seals, and lubricants are also readily available.

7. **Cost-Effective for High-Performance Needs:** While it may not be the cheapest option, its performance justifies the cost for applications where reliability and precision are non-negotiable. It often outperforms cheaper alternatives like plain bearings or bushings in the long run.

8. **Versatility:** The bearing can be used in both horizontal and vertical orientations, though vertical use may require additional support to prevent sagging under heavy loads.

9. **Maintenance-Friendly:** Unlike some high-performance bearings, the LMK30LUU can be serviced relatively easily lubrication can be reapplied without disassembly in many cases, and wear can be monitored visually.

10. **Standardization:** Being part of the LM series, it adheres to industry standards, ensuring compatibility with other components like linear slides, actuators, or guide systems.

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**Cons:**

1. **Higher Initial Cost:** Compared to plain bearings or bushings, LM bearings like the LMK30LUU are more expensive upfront. This may be a barrier for small-scale or budget-conscious projects.

2. **Requires Proper Installation:** Misalignment or improper mounting can lead to premature wear or failure. The bearing must be securely fastened to prevent vibration or movement during operation. Flange-mounted bearings like this one demand precise surface preparation (e.g., flat, clean mounting surfaces).

3. **Sensitivity to Contaminants:** While some variants are sealed, the LMK30LUU may still be vulnerable to dust, debris, or moisture if not adequately protected. In dirty environments, additional sealing or covers may be necessary.

4. **Limited Self-Alignment:** Unlike some spherical or self-aligning bearings, the LMK30LUU does not compensate for minor misalignments between the bearing and rail. Misalignment can cause uneven wear or increased friction.

5. **Lubrication Dependency:** Performance degrades if lubrication is insufficient or degraded over time. While it can run dry for short periods, prolonged dry operation will increase wear and friction.

6. **Not Ideal for Extremely High Speeds:** While it handles moderate speeds well, the LMK30LUU is not optimized for high-speed applications (e.g., above 10 m/s), where other bearing types (like cross-roller bearings) may be more suitable.

7. **Space Requirements:** The flange and overall length (123mm) may not fit in compact designs. If space is extremely limited, alternative bearings or designs may be more appropriate.

8. **Potential for Ball Circulation Issues:** In rare cases, debris or manufacturing defects can cause the recirculating balls to jam or fail to circulate properly, leading to localized wear or failure. Regular inspection is recommended.

9. **Compatibility with Non-Standard Rails:** While it works with standard LM30UU rails, mixing it with non-standard or lower-quality rails can compromise performance. Ensure all components are from the same manufacturer or are verified for compatibility.

10. **Skill Dependency:** Proper installation, lubrication, and maintenance require some mechanical knowledge. Inexperienced users may struggle with alignment or troubleshooting issues.

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**Conclusion:**

The LMK30LUU linear bearing is an excellent choice for applications demanding high precision, smooth motion, and durability. Its strengths lie in its load capacity, low friction, and compatibility with standard linear systems, making it ideal for CNC machines, 3D printers, robotics, and automated equipment. However, its higher cost, sensitivity to installation and environmental factors, and maintenance requirements may not make it suitable for all projects particularly those with tight budgets, limited space, or high-speed requirements.

For most mid-to-high-end applications where reliability and accuracy are critical, the LMK30LUU offers a compelling balance of performance and longevity. If cost is a major concern or if the application involves extreme conditions (e.g., high speeds, heavy contamination), alternatives like cross-roller bearings, plain bearings with solid lubrication, or custom designs may need to be considered.

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**Recommendation:** Buy the LMK30LUU linear bearing if:

- Your application requires precise, low-friction linear motion (e.g., CNC milling, 3D printing, pick-and-place robots).

- You are working with standard LM30UU rails and have a clean, controlled environment (or can implement proper sealing).

- You prioritize durability and can invest in proper installation and maintenance (e.g., lubrication, alignment checks).

- Your budget allows for the higher upfront cost, as the long-term benefits outweigh the initial expense.

Avoid the LMK30LUU if:

- Your project has a very tight budget and cheaper alternatives (e.g., plain bearings) can meet your performance needs.

- Your design has extreme space constraints or requires high-speed operation.

- Your environment is highly contaminated (e.g., unsealed industrial settings), and you cannot implement additional protection.

- You lack the mechanical expertise to install or maintain the bearing properly.

For best results, pair the LMK30LUU with:

- High-quality LM30UU rails (from the same manufacturer if possible).

- Proper lubrication (e.g., grease or oil, depending on the application).

- A clean, flat mounting surface and secure fastening.

- Optional accessories like end caps or seals if operating in dirty environments.

If unsure, consult with a supplier or engineer to confirm compatibility with your specific setup.

Details:

This long-type bearing features an LMF-L type flange with four flat surfaces for easy mounting and excellent torque resistance. Provide: Zip code, commercial/residential location, lift gate needs. Can ship using your UPS account number upon request. Country of Origin: Japan.

MPN: LMK30LUU. Manufacturer: THK. Condition: Used. Buyer pays return shipping unless item was misrepresented.

Made of reinforced carbon steel with double rubber seals for superior dust protection. Tested and fully functional. Type: Linear Bearing. Quality New Surplus and Used Industrial Automation Controls Equipment.

Part Number: LMK30LUU. Media 1: THK LMK30LUU Linear Bearing - Photo. Model: LMK30LUU. Notes: Previously used item in good condition.

part #: lmk30luu prices

  • $35.00-$98.00

specifications linactuat:

  • brand: Thk
  • mpn: Lmk30luu
  • shelf: K-65
  • type: Linear Bearing
  • country of origin: Japan
  • inside diameter: 30 Mm
  • outside diameter: 45 Mm

seller linactuat:

  • rating: 100.0%
  • city: Bardstown, Kentucky
  • # reviews: 6870

shipping linactuat:

  • carrier: UPS
  • transit: 2-4 Days
  • class: Standard, Expedited, One-day
  • cost: $17.41
  • service: UPS Ground, UPS 2nd Day Air, UPS Next Day Air
  • type: Calculated

returns linactuat:

  • policy: Returns Accepted
  • time: 30 Days
  • method: Money back
  • paid by: Buyer

general linactuat:

  • condition: Used
  • Industrial Automation Motion Controls > Rotary Linear Motion > Linear Bearings Bushings

payments linactuat:

  • wallet: Apple-pay
  • credit card: Visa
  • other

offer linactuat:

  • availability: In Stock
  • best offers: True
  • options: Ship-to-home
  • quantity: 1
  • started: May 12, 2026
  • sold: 0
shelf: k-65, type: linear bearing, country of origin: japan, inside diameter: 30 mm, outside diameter: 45 mm,
category: business & industrial > industrial automation motion controls > rotary linear motion > linear bearings bushings, sku: 14599328682971773,
Thk LMK30LUU Is Similar To:
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3 offers $35.00–$98.00 USD
  • Used. Offer #1 priced at $35.00 + $17.41 shipping estimate = $52.41* total. This long-type bearing features an LMF-L type flange with four flat surfaces for easy mounting and excellent torque resistance. The THK is a rectangular flanged linear ball bearing designed for precision linear motion applications.+$17.41 shipping
  • New. Offer #2 priced at $98.00 + $0.00 shipping estimate = $98.00* total. Un-used new condition. Bearing still in original box.FREE SHIPPING
  • New. Offer #3 priced at $55.76 + $36.88 shipping estimate = $92.64* total. Credit Card. LINEAR BALL.+$36.88 shipping

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