Multifunctional Square Extended Linear Bearings

Model: LMK...L

Multifunctional square extended linear bearings are advanced mechanical components designed to provide smooth, precise, and reliable linear motion in a variety of applications. These bearings are engineered to combine multiple functionalities into a single, compact unit, making them an ideal choice for modern industrial and mechanical systems. With their unique square shape and extended design, they offer enhanced stability, load-bearing capacity, and versatility compared to traditional linear bearings.

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Product description

Introduction to LMK LUU Linear Bearing

Product Overview and Model Explanation

A standardized extended square flange linear motion bearing in the LM series (metric), the LMK LUU excels in high precision, low friction, and broad adaptability. As a core component for linear reciprocating motion in industrial automation and precision equipment manufacturing, it is widely used in mid-to-high-end transmission scenarios, thanks to its compact structure, easy installation, and robust durability. Its model code clearly indicates key features: LMK for square flange (direct mounting), L for extended inner cylinder (enhanced stress stability), and UU for double-sided metal seals (balanced protection and lubrication retention). Integrating installation, sealing, and transmission, it complies with industry standards for seamless compatibility with similar equipment.

Material and Structural Design

Engineered for high reliability, the LMK LUU uses GCr15 high-carbon chromium bearing steel—boasting excellent hardenability and wear resistance. Surface quenching achieves HRC60-62 hardness and ≤0.8μm surface roughness, effectively enhancing resistance to wear and deformation. The interior features a precision-ground inner hole and TN engineering plastic cage, which secures ball trajectory to prevent offset and collision, ensuring smooth, low-noise transmission. Double-sided metal seals (integrated stamping) provide strong protection against dust and water. Pre-filled with factory-applied long-acting lithium soap grease, it minimizes maintenance costs and suits -15℃~80℃ conventional working conditions, with customized models for extreme temperatures.

Specification Parameters and Installation Characteristics

It offers comprehensive specifications, with inner diameters ranging from 6mm to 60mm (matching varied outer diameters, total lengths, and flange sizes). A typical model, LMK25LUU (25mm ID, 40mm OD, 112mm length), is ideal for small-to-medium load applications. With a maximum dynamic load of 20000N and static load of 6080N, it delivers high transmission precision via point-contact with quenched linear shafts. The square flange includes standard mounting holes (no extra shaft supports needed), simplifying assembly. Fully ISO-compliant, it enables seamless replacement of similar products and supports non-standard customization. Precise outer diameter tolerance ensures a tight fit with the bearing seat, boosting operational stability.

Core Product Advantage

The LMK LUU boasts distinct core advantages. Its extended inner cylinder increases shaft contact length, reducing offset and vibration during high-speed reciprocation, with ≤±0.01mm repeat positioning error for precision transmission. The point-contact structure (paired with precision grinding) ensures ultra-low friction and ≤45dB operating noise, making it perfect for quiet environments like medical equipment and precision instruments. Optimized raceway design and ball density allow 0.01-0.05mm preload adjustment, enhancing equipment rigidity by 30% for high-frequency start-stop and high-speed transmission. Compared to imported equivalents, it offers superior cost performance, balancing quality and procurement costs for batch applications.

Applicable Application Scenarios

It serves a wide range of applications, including precision/automation equipment (3D printers, CNC engravers, robotic arms, CNC machine tools) and civilian/specialized fields (food packaging machines, textile machinery, auto parts processing). Anti-corrosion customized models meet food processing hygiene standards, while medical-grade versions withstand high-temperature steam sterilization. Additionally, it pairs with specialized equipment (e.g., brick stacking manipulators) to ensure precise positioning, improving production efficiency and qualification rates.

Usage and Maintenance Specifications

Standardized operation and maintenance are critical: For grease lubrication, remove anti-rust oil first and apply N0.2 lithium soap grease. For oil lubrication, use VG15-100 oil (not for non-porous sealed models). Ensure the transmission shaft is straight during installation—we recommend a double-shaft, multi-bearing setup, with unobstructed movement post-assembly. Regularly inspect seals and grease, replacing/refilling promptly to prevent impurity intrusion and dry-friction damage.

About Us

Lishui City Jialida Bearing Co., Ltd.

We are a Multifunctional Square Extended Linear Bearings manufacturers specializing in R&D, production and operation of custom Multifunctional Square Extended Linear Bearings.
Mainly including ball screws, linear guides (linear rail), linear shaft, linear bearings, rod end bearing, linear sliding units, spherical bearings, needle roller bearings, radial bearings, etc.
The company's products are of high quality and are widely used in various mechanical supporting equipment such as precision machinery, fitness equipment, printing, packaging machinery, medical and pan-therapeutic, food machinery, and textile machinery automation production.

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