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Model NART

THK’s Roller Follower Model NART represents a specialized advancement in linear motion components, engineered to deliver exceptional performance in applications requiring smooth, precise guidance under significant radial and moment loads. This compact yet robust unit integrates a high-rigidity outer ring with a precisely ground raceway, housing needle rollers that rotate smoothly between the inner shaft and outer ring. The design incorporates a stud-type configuration with a threaded section for straightforward mounting, while the outer ring features a crowned or cylindrical profile to minimize edge stress and extend service life. Key technical attributes include the use of high-carbon chromium bearing steel for critical components, heat-treated to achieve optimal hardness and wear resistance, alongside seals that effectively shield internal elements from contaminants like dust, chips, and moisture. Available in standard and sealed variants, the Model NART is offered in multiple size series to accommodate diverse load capacities and space constraints.

Performance advantages of the NART Roller Follower stem from its optimized roller guidance system, which ensures low friction operation and high positional accuracy even at elevated speeds. The crowned outer ring design distributes loads evenly across the roller contact surface, reducing localized stress concentrations and preventing premature brinelling or fatigue. This results in quieter operation, reduced vibration transmission, and enhanced dynamic load ratings compared to conventional ball-based followers. The sealed versions further bolster reliability in harsh environments by retaining lubrication and excluding abrasive particles, significantly prolonging maintenance intervals and operational lifespan. Additionally, the stud’s precision threads and machined seating surfaces facilitate secure installation, minimizing alignment errors and ensuring consistent tracking accuracy over long-term use. These characteristics collectively contribute to lower total cost of ownership through reduced downtime and replacement frequency.

Typical applications for the THK Roller Follower Model NART span a broad spectrum of industrial machinery, automotive systems, and precision equipment where guided linear motion is critical. In industrial automation, it is commonly deployed in cam-driven mechanisms, indexing tables, transfer lines, and packaging machinery to support reciprocating motions with high repeatability. Automotive manufacturing lines utilize these followers in welding robots, assembly jigs, and material handling systems to withstand shock loads and maintain precision under continuous operation. Within precision equipment, the NART finds use in semiconductor fabrication tools, optical positioning stages, and medical device actuators, where its low friction and minimal backlash are essential for micron-level accuracy. The component’s versatility also extends to mold clamping devices, printing presses, and textile machinery, underscoring its role as a foundational element in enhancing the efficiency and durability of motion-critical systems across sectors.

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NART-VR SERIES
THK's Roller Follower Model NART and NART VR SERIES represents a pinnacle of engineering in linear motion components, designed to deliver exceptional precision, durability, and load capacity in demanding industrial environments. These compact yet robust units feature a stud-type design with a crowned outer ring and needle rollers, ensuring smooth, low-friction linear motion even under heavy loads and high-speed conditions. The NART VR variant incorporates a unique V-groove on the outer ring, enabling precise guidance along V-shaped rails or tracks, which is critical for applications requiring accurate alignment and resistance to moment loads. Both series are constructed from high-carbon chromium bearing steel (SUJ2), heat-treated to achieve superior surface hardness and core toughness, significantly extending service life and reducing maintenance intervals. Key technical features include integral seals that effectively exclude contaminants like dust, chips, and moisture, while retaining grease lubrication for long-term performance. The stud shaft is machined to tight tolerances, facilitating easy installation and stable mounting in various configurations. Performance advantages of the NART and NART VR SERIES are evident in their ability to handle combined radial and axial loads, with the V-groove design providing excellent resistance to overturning moments and vibration. This results in enhanced operational stability, reduced noise levels, and improved positional accuracy, making them ideal for high-precision automation. The low-friction needle roller construction minimizes heat generation and energy consumption, contributing to overall system efficiency. Additionally, their corrosion-resistant options, such as surface treatments or stainless-steel components, ensure reliability in harsh environments, including those exposed to coolants or washdowns. Typical applications span across industrial machinery, automotive systems, and precision equipment. In industrial automation, these roller followers are widely used in linear guides for machine tools, packaging machinery, and material handling systems, where they support sliding tables, conveyors, and indexing units with repeatable accuracy. The automotive industry leverages them in welding robots, assembly jigs, and transfer lines, where their durability and precision ensure consistent performance in high-cycle operations. For precision equipment, such as semiconductor manufacturing devices, optical positioning systems, and medical diagnostics, the NART VR SERIES' V-groove capability provides critical alignment stability, enabling micron-level accuracy. By integrating THK's Roller Follower NART and NART VR SERIES, engineers can achieve reliable, long-lasting motion control solutions that enhance productivity and reduce downtime across diverse sectors.
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NART-R SERIES
THK's Roller Follower Model NART/NART R SERIES represents a specialized class of linear motion components engineered for applications demanding high rigidity, exceptional load capacity, and precise guidance under challenging conditions. These units integrate a stud-type or yoke-type housing with a high-precision, crowning-profiled roller that rotates on a sealed, pre-lubricated needle roller bearing. This fundamental design, featuring a through-hole for optimal grease retention and re-lubrication, is built to withstand heavy loads and moment forces while ensuring smooth, low-friction motion and an extended operational lifespan. The technical features of the NART SERIES are defined by their robust construction and precision engineering. The outer ring, which acts as the rolling contact surface, is through-hardened and finished with a crowning profile. This critical geometry prevents stress concentration at the edges, distributing loads evenly across the roller face and significantly reducing edge-loading, which is a common failure mode in competing designs. The stud-type (NART) and yoke-type (NART R) configurations offer versatile mounting solutions to accommodate different structural designs. Internally, the needle roller bearing is caged to minimize friction and heat generation at high speeds, while integrated seals on both sides effectively shield the bearing from contaminants like dust, chips, and moisture, preserving lubricant integrity and preventing premature wear. Performance advantages are immediately evident in the series' ability to handle very high radial loads, along with substantial moment and eccentric loads, making them significantly more robust than standard ball-based followers. The low coefficient of friction and high rigidity contribute to exceptional positional accuracy and repeatability, which is crucial for precision automation. Their durability in harsh environments translates to reduced maintenance frequency, lower lifecycle costs, and increased machine uptime. The availability of both standard and sealed types allows for selection based on the specific cleanliness and lubrication requirements of the application. Typical applications for the THK NART/NART R SERIES are found across industries where heavy loads and precise, reliable motion are paramount. In industrial machinery, they are indispensable in the cam drives of automated assembly and transfer lines, as guide rollers in heavy-duty sliding doors and gates, and as support units in large-scale material handling equipment. Within automotive manufacturing systems, they serve as robust guides in welding and painting robots, fixture locators in body-in-white assembly jigs, and as followers in high-duty indexing mechanisms. For precision equipment, these roller followers provide the necessary stability and accuracy in semiconductor manufacturing apparatus, precision inspection and measuring machines, and advanced optical positioning systems, ensuring consistent performance under demanding cyclical and static load conditions.
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