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Rotary nut Ball Screw

THK Ball Screw Rotary Nut Ball Screws represent a specialized category of precision linear motion components where the nut rotates while the screw remains stationary, reversing the typical operational configuration of standard ball screws. This design is engineered to address specific mechanical challenges in applications requiring compact, high-efficiency rotary-to-linear motion conversion. The system consists of a precision-ground screw shaft with a helical raceway and a nut that incorporates a circulating ball mechanism, allowing for smooth, low-friction movement. Key technical features include the use of high-carbon chromium bearing steel for both the screw and nut, ensuring exceptional hardness and wear resistance. The nut is designed with integrated flange mounts for secure attachment to rotating elements like servo motors or gearboxes, while the screw can be fixed axially to prevent rotation. Preload adjustment mechanisms are often incorporated to eliminate backlash, maintaining positioning accuracy even under varying loads. Advanced sealing options, such as labyrinth seals or wipers, protect the internal ball circuits from contaminants like dust, chips, or moisture, extending service life in harsh environments.

Performance advantages of THK Rotary Nut Ball Screws are substantial, starting with their ability to achieve high linear speeds and accelerations due to the rotating nut’s lower inertia compared to moving the entire screw assembly. This makes them ideal for dynamic applications where rapid positioning is critical. They offer positioning accuracy within microns and repeatability that meets the demands of precision automation, supported by THK’s proprietary grinding technologies that minimize cumulative pitch errors. Efficiency is another standout benefit; with a mechanical efficiency exceeding 90%, they reduce power consumption and heat generation, allowing for continuous operation without derating. The compact design saves valuable space in machinery layouts, as the stationary screw eliminates the need for long rotational clearances. Durability is enhanced through optimized heat treatment processes and surface finishing, which resist pitting and fatigue under high-load conditions. Noise levels are notably low due to precision-machined components and smooth ball recirculation, contributing to quieter operational environments.

Typical applications leverage these strengths across multiple industries. In industrial machinery, THK Rotary Nut Ball Screws are deployed in CNC machining centers for tool changers and pallet shuttles, where their high-speed and accuracy enable reduced cycle times. They are integral to automated assembly lines, driving pick-and-place units and linear actuators in robotics. Within automotive manufacturing, these components are found in welding robots, tire mounting systems, and engine assembly equipment, providing the reliability needed for high-volume production. Precision equipment sectors utilize them in semiconductor manufacturing apparatus, such as wafer handling robots and lithography stages, where sub-micron accuracy is non-negotiable. Medical device manufacturers incorporate these ball screws into MRI positioning tables and surgical robot arms, benefiting from their smooth motion and contamination resistance. Additionally, they serve in aerospace testing rigs and optical alignment systems, where their low backlash and high stiffness ensure consistent performance under demanding conditions.

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Model BNS-V SERIES
The THK Ball Screw Rotary Nut Ball Screw Model BNS V SERIES represents a sophisticated evolution in rotary nut ball screw technology, engineered specifically for applications requiring exceptional precision, high-speed operation, and reliable performance in demanding environments. This series features a unique design where the nut rotates while the screw remains stationary, effectively eliminating critical speed limitations associated with rotating screw designs. This fundamental architectural advantage allows for dramatically increased rotational speeds, significantly enhancing operational throughput and efficiency in high-cycle machinery. Key technical features of the BNS V SERIES include a compact and lightweight rotary nut assembly, which simplifies system design by reducing the need for bulky support bearings and complex drive mechanisms typically required for rotating screws. The nut incorporates THK's precision-ground screw shaft with optimized ball circulation pathways, ensuring smooth, low-vibration motion and consistent accuracy. It is available with various lead and accuracy grades to match specific application requirements, from general automation to ultra-precise positioning. The series is designed for easy integration with standard servo motors and can be equipped with optional encoders for closed-loop position feedback, further enhancing its suitability for advanced motion control systems. Performance advantages are substantial and multifaceted. The stationary screw design inherently prevents whipping and vibration at high speeds, leading to superior positional stability and repeatability, often within microns. This results in improved surface finishes in machining applications and higher quality in assembly processes. The elimination of screw rotation also drastically reduces inertia, allowing for faster acceleration and deceleration rates, which minimizes cycle times and boosts overall equipment effectiveness (OEE). Furthermore, the design promotes excellent heat dissipation, as the primary heat source (the nut) is rotating and actively cooled, contributing to long-term thermal stability and sustained accuracy during continuous operation. Built with high-durability materials and THK's proprietary lubrication systems, these ball screws offer an extended service life with minimal maintenance, even under heavy loads and in contaminated environments. Typical applications for the BNS V SERIES are found across industries where speed, precision, and reliability are paramount. In industrial machinery, it is extensively used in high-speed CNC machining centers for tool changing mechanisms, high-frequency pick-and-place units in electronic assembly lines, and rapid-traverse axes in laser cutting and waterjet cutting systems. Within the automotive sector, these ball screws are critical components in automated welding and riveting robots, precision brake disc machining lines, and high-speed testing equipment for powertrain components. For precision equipment, the BNS V SERIES is ideal for semiconductor wafer handling robots, medical device assembly systems, and advanced optical alignment stages, where its smooth motion and exceptional accuracy ensure flawless operation and high yield rates.
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Model BNS-A SERIES
The THK Ball Screw Rotary Nut BNS A SERIES represents a sophisticated evolution in linear motion technology, engineered specifically for applications requiring high-speed rotation and precise axial movement. This series features a unique rotary nut design where the nut itself rotates while the screw shaft remains stationary, enabling exceptional rotational speeds up to 10,000 rpm while maintaining smooth axial travel. Constructed with precision-ground screw shafts and high-carbon chromium bearing steel components, the BNS A SERIES incorporates advanced ball recirculation technology that minimizes vibration and noise during operation. The compact, cylindrical nut housing integrates preloaded ball bearings to eliminate backlash, ensuring positional accuracy within ±0.01mm across the entire travel length. Special seal configurations with multi-layer labyrinth seals and grease retention systems provide IP65-equivalent protection against contaminants while extending maintenance intervals to over 20,000 hours of continuous operation. Performance advantages stem from its optimized dynamic load capacity and thermal management characteristics. The series achieves dynamic load ratings up to 15 kN while maintaining operational temperatures 15-20% lower than conventional ball screw designs through integrated cooling fins and optimized grease distribution. This thermal stability allows for continuous operation at maximum speeds without degradation in positioning accuracy. The rotary nut configuration eliminates whip phenomenon commonly associated with rotating screw designs, enabling stroke lengths up to 3 meters while maintaining synchronous accuracy across multiple parallel installations. Energy efficiency reaches new benchmarks with 30% reduced torque requirements compared to equivalent ball screw systems, achieved through proprietary ball groove geometry and surface treatment technologies that reduce rolling resistance. Industrial implementations span high-demand automation environments where the BNS A SERIES demonstrates particular excellence in automotive manufacturing robotics performing continuous weld seam tracking with repeatability of ±0.003mm. Semiconductor fabrication equipment utilizes these components in wafer handling robots requiring rapid vertical positioning between process chambers, where the rotary nut design prevents particulate generation in cleanroom environments. Packaging machinery benefits from the series' ability to maintain precise fill levels during high-speed container indexing operations, while CNC tool changers leverage the instantaneous reversal capabilities for tool selection cycles under 0.5 seconds. Medical device assembly systems employ these ball screws for delicate component placement where the vibration-damping characteristics prevent damage to micron-scale components, and aerospace testing equipment utilizes the series for fatigue testing fixtures requiring millions of precise positioning cycles without maintenance intervention. The combination of high rotational capability, thermal resilience, and contamination resistance makes the BNS A SERIES particularly valuable in multi-axis gantry systems where synchronized motion across long spans is critical for manufacturing large composite structures in automotive and aerospace applications.
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Model BNS SERIES
The THK Ball Screw Rotary Nut Ball Screw Model BNS SERIES represents a specialized configuration where the nut rotates while the screw shaft remains stationary, offering unique mechanical advantages in compact motion control applications. Engineered for high-speed operation and precise positioning, this series features a precision-ground screw shaft with optimized ball groove geometry that ensures smooth motion transmission and minimal vibration. The rotary nut design incorporates a high-rigidity flange for secure mounting and efficient torque transmission, while advanced sealing systems protect internal components from contaminants in harsh industrial environments. Preloaded ball nuts eliminate axial play, delivering exceptional positioning accuracy and repeatability across millions of operating cycles. Key technical features include the series' ability to achieve rotational speeds up to 10,000 rpm while maintaining thermal stability through optimized heat dissipation characteristics. The ball recirculation system utilizes THK's proprietary circuit design that minimizes noise generation and prevents ball crowding during high-velocity operation. Available in nominal diameters from 6mm to 50mm with standardized lead options, the BNS series offers multiple accuracy classes (C3 to C7) to match application requirements. The compact nut design reduces overall system footprint while maintaining high load capacities, with dynamic load ratings reaching 8.9 kN and static load ratings up to 22.5 kN depending on model specifications. Performance advantages stem from the reversed operational concept where rotating the nut instead of the screw eliminates potential whip in long-stroke applications and simplifies drive system integration. This configuration provides superior rotational balance at high speeds, reducing system vibration and enabling smoother motion profiles. The design achieves positioning accuracy within ±5μm/300mm while maintaining operational efficiency exceeding 90% due to optimized ball contact angles and surface finishing. Maintenance requirements are significantly reduced through the incorporation of long-life grease reservoirs and wear-resistant components that extend service intervals even in continuous operation scenarios. Typical applications leverage these characteristics across multiple industries. In industrial machinery, BNS series units drive automated tool changers in machining centers, provide precise indexing in rotary tables, and actuate high-speed pick-and-place systems in packaging equipment. Automotive manufacturing systems employ these ball screws for wheel assembly robots, transmission testing apparatus, and precision welding positioners requiring both rotational and linear motion. Within precision equipment, the series enables accurate Z-axis positioning in semiconductor wafer handlers, optical alignment stages in measurement instruments, and sample manipulation systems in medical analyzers where compact dimensions and vibration-free operation are critical. The combination of high-speed capability, positional accuracy, and robust construction makes the BNS series particularly suitable for applications demanding both rotary and linear motion in space-constrained environments.
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Model NS-V SERIES
The THK Ball Screw Rotary Nut Ball Screw Model NS V SERIES represents a sophisticated evolution in linear motion technology, engineered specifically for applications requiring high-speed rotation and precise axial movement. This series features a unique rotary nut design where the nut rotates while the screw remains stationary axially, enabling exceptional rotational speeds up to 10,000 rpm while maintaining smooth, accurate linear travel. Constructed with precision-ground threads and high-carbon chromium bearing steel, the NS V SERIES incorporates THK's proprietary ball circulation system that minimizes vibration and noise even under demanding operational conditions. Each component undergoes rigorous heat treatment and surface finishing processes to ensure durability, with preloaded ball nuts eliminating backlash for consistent positioning accuracy within microns. Key technical features include an optimized ball groove profile that enhances load distribution, extending service life under heavy loads up to 50 kN dynamic capacity. The integrated seal structure effectively excludes contaminants while retaining lubrication, making these ball screws suitable for harsh environments. With cooling channels available as an option, the NS V SERIES can sustain high-speed operations without thermal expansion compromising precision. Performance advantages are particularly evident in reduced energy consumption due to lower torque requirements and maintenance-free operation intervals exceeding 20,000 hours. The compact flange-mounted nut design simplifies integration into existing systems while providing higher stiffness than conventional designs. Typical applications span multiple industries where reliability and speed are critical. In industrial machinery, these ball screws drive high-frequency pick-and-place robots and CNC machining centers requiring rapid tool changes. Automotive manufacturing lines utilize them in electric power steering systems for precise torque control and in automated assembly stations for engine component positioning. The precision equipment sector employs NS V SERIES ball screws in semiconductor wafer handling robots, medical diagnostic instrument stages, and optical alignment systems where sub-micron repeatability is mandatory. Their ability to maintain performance under continuous duty cycles makes them ideal for packaging machinery, printing presses, and aerospace testing equipment requiring synchronized rotary-linear motion.
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Model NS-A SERIES
The THK Ball Screw Rotary Nut Ball Screw Model NS A SERIES represents a sophisticated evolution in linear motion technology, engineered specifically for applications requiring compact design, high precision, and reliable torque transmission. This series features a unique rotary nut configuration where the nut rotates while the screw shaft remains stationary, effectively reversing the operational principle of conventional ball screws. This design is particularly advantageous in space-constrained environments, as it eliminates the need for rotational clearance around the screw shaft, allowing for more streamlined machinery layouts. The NS A SERIES incorporates a precision-ground screw shaft with optimized ball groove geometry, ensuring smooth motion, minimal friction, and consistent performance under varying loads. Key technical features of the NS A SERIES include its high axial rigidity, achieved through a compact nut design and advanced preloading mechanisms that minimize deflection under load. The series is available in a range of diameters and leads, catering to diverse speed and force requirements. It utilizes high-grade steel for the screw shaft and nut, complemented by THK's proprietary ball circulation system that prevents ball dropout and ensures efficient recirculation even at high rotational speeds. The nut is equipped with integrated seals that protect against contaminants such as dust and moisture, significantly enhancing service life in harsh industrial environments. Additionally, the model supports customizable mounting options, including flange and cylindrical types, facilitating straightforward integration into existing systems. Performance advantages of the NS A SERIES are substantial, starting with its ability to deliver high positional accuracy and repeatability, critical for precision tasks. The rotary nut design reduces inertia by localizing rotating mass to the nut, enabling faster acceleration and deceleration cycles without compromising stability. This results in improved dynamic response, higher efficiency, and reduced energy consumption compared to traditional screw-driven systems. The ball screw's low noise operation and minimal vibration contribute to smoother machinery performance, while its high load capacity—supporting both axial and moment loads—ensures durability in demanding applications. Maintenance requirements are minimal due to the long-lasting lubrication and robust sealing, reducing downtime and total cost of ownership. Typical applications for the THK NS A SERIES span multiple industries, leveraging its compact and high-performance design. In industrial machinery, it is commonly used in CNC machining centers, automated assembly robots, and material handling equipment where precise linear positioning and space efficiency are paramount. Within automotive systems, the series finds use in electric power steering mechanisms, brake testing rigs, and engine valve control systems, benefiting from its reliability and torque transmission capabilities. In precision equipment, it supports applications such as semiconductor manufacturing devices, medical imaging systems, and optical alignment instruments, where minimal backlash and high-speed accuracy are essential. By combining innovative design with rigorous engineering, the NS A SERIES provides a versatile solution for advancing automation and precision across modern industrial and technological landscapes.
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Model NS SERIES
The THK NS SERIES Ball Screw with Rotary Nut represents a specialized linear motion solution engineered for applications requiring continuous rotation of the nut while the screw shaft remains stationary. This configuration is particularly advantageous in space-constrained designs or systems demanding simplified drive arrangements. The NS SERIES incorporates precision-ground ball screws with a uniquely designed rotary nut that integrates a compact, high-torque motor directly into the assembly. This design eliminates the need for external couplings or complex drive mechanisms, reducing overall system footprint and enhancing mechanical efficiency. Key technical features include the utilization of THK's proprietary precision grinding technology, ensuring exceptional lead accuracy and minimal axial play. The ball screw employs a large-diameter ball circuit with optimized contact angles, distributing load evenly across multiple recirculating balls. This configuration significantly increases dynamic load capacity while maintaining smooth, low-friction operation. The rotary nut assembly features precision angular contact bearings pre-loaded to eliminate backlash, coupled with advanced sealing systems that provide robust protection against contaminants. Electrical integration is facilitated through standardized motor interfaces supporting various servo and stepper motor configurations, with optional encoders for closed-loop position control. Performance advantages are substantial across multiple operational parameters. The direct-drive rotary nut configuration achieves rotational speeds up to 3,000 rpm while maintaining positioning accuracy within ±5 μm per 300 mm travel. High mechanical efficiency exceeding 90% reduces power consumption and heat generation, enabling continuous duty cycles in demanding environments. The compact design reduces overall system weight by up to 40% compared to conventional screw-driven systems, while the integrated motor eliminates alignment issues common with coupled designs. Enhanced stiffness characteristics provide improved dynamic response with acceleration capabilities exceeding 2G, making the system ideal for high-throughput applications. Typical industrial applications span multiple sectors where precision motion control is critical. In industrial robotics, NS SERIES units facilitate compact joint actuation in articulated arms and gantry systems, enabling precise positioning in welding, dispensing, and assembly operations. Automotive manufacturing systems employ these components in electronic power steering mechanisms, active suspension controls, and automated transmission systems where reliability and compact packaging are essential. Precision equipment applications include semiconductor manufacturing apparatus, where the series provides nanometer-level positioning in wafer handling and lithography stages, and medical imaging systems requiring vibration-free linear motion in CT scanner gantries and MRI positioning tables. The combination of high precision, compact design, and reliability makes the NS SERIES particularly valuable in automated test equipment, optical alignment systems, and aerospace actuation systems where performance cannot be compromised.
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Model DIR SERIES
THK's DIR SERIES Ball Screw with Rotary Nut represents a sophisticated evolution in linear motion technology, engineered specifically for applications requiring high-speed rotation and precise axial movement. This innovative design features a rotating nut configuration where the nut itself rotates while the screw shaft remains stationary, enabling exceptional rotational speeds up to 10,000 rpm while maintaining precise linear positioning accuracy within ±0.01mm. The series incorporates THK's proprietary precision-ground screw shafts with optimized groove profiles and high-grade bearing steel construction, ensuring minimal friction and extended service life even under continuous high-load conditions. Key technical features include the integration of preloaded double-nut assemblies that eliminate axial backlash, critical for applications demanding high positional repeatability. The rotary nut design incorporates precision angular contact ball bearings directly into the nut housing, allowing for direct motor coupling without additional support bearings. This compact configuration reduces overall system length by up to 30% compared to conventional ball screw arrangements. Advanced sealing systems with multi-lip seals and grease retention features provide IP65-level protection against contaminants while maintaining optimal lubrication. The series offers multiple accuracy grades (C3 to C7) and various screw diameters from 16mm to 50mm to accommodate different load capacities ranging from 15kN to 180kN. Performance advantages stem from the unique rotating nut architecture, which enables significantly higher rotational velocities than traditional designs while minimizing vibration and heat generation. The direct drive configuration achieves acceleration rates up to 2G and linear speeds exceeding 3m/s with positioning repeatability of ±0.003mm. Thermal deformation is minimized through optimized heat dissipation paths and optional cooling features, maintaining precision during extended operation cycles. Efficiency ratings exceed 90% due to reduced mechanical losses, while noise levels remain below 65dB even at maximum operating speeds. The design's inherent stiffness provides natural frequencies above 200Hz, eliminating resonance issues in high-speed applications. In industrial machinery, the DIR SERIES excels in high-speed pick-and-place systems, semiconductor manufacturing equipment, and automated assembly lines where rapid cyclic motion and precise positioning are paramount. Automotive manufacturing applications include robotic welding arms, precision press feeds, and electric vehicle battery assembly systems requiring both high throughput and micron-level accuracy. For precision equipment, these ball screws are indispensable in medical device manufacturing, optical alignment systems, and coordinate measuring machines where smooth motion quality and sub-micron precision are critical. The series' robust construction and maintenance-free operation intervals exceeding 20,000 hours make it particularly suitable for 24/7 production environments where reliability and minimal downtime are essential.
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Model BLR SERIES
THK's BLR SERIES Ball Screw Rotary Nut Ball Screw represents a sophisticated evolution in linear motion technology, engineered to deliver exceptional precision, reliability, and versatility in demanding industrial applications. This innovative model features a unique rotary nut design where the nut rotates while the screw remains stationary, effectively reversing the conventional ball screw operation. This configuration allows for simplified mechanical layouts, reduced system inertia, and enhanced dynamic performance, making it ideal for scenarios requiring high-speed, high-accuracy linear motion with minimal space constraints. Key technical features of the BLR SERIES include a compact and lightweight rotary nut assembly, precision-ground screw shafts for smooth and consistent motion, and high-capacity ball circuits that optimize load distribution and minimize wear. The series incorporates THK's advanced ball recirculation technology, ensuring low noise operation and extended service life even under rigorous cycling conditions. Available in various lead and accuracy grades, the BLR SERIES supports customization to meet specific application requirements, with options for preloading to eliminate backlash and enhance positional accuracy. Additionally, the design facilitates easy integration with motors and drive systems, thanks to standardized flange and shaft configurations. Performance advantages are substantial, starting with exceptional rotational speed capabilities enabled by the rotary nut's balanced design and efficient heat dissipation. This allows for faster acceleration and deceleration, boosting throughput in automated systems. The stationary screw eliminates the need for complex support structures, reducing overall system weight and simplifying installation. High rigidity and precision contribute to repeatability within micron-level tolerances, critical for tasks involving fine positioning. Moreover, the BLR SERIES demonstrates excellent efficiency, with low torque requirements that translate to energy savings and reduced operational costs over time. Its durability is reinforced by corrosion-resistant materials and seals that protect against contaminants, ensuring reliable performance in harsh environments like those with dust, chips, or moisture. Typical applications span multiple high-tech industries, leveraging the BLR SERIES' strengths in precision and speed. In industrial machinery, it is commonly deployed in CNC machining centers for tool changers and spindle drives, where rapid and accurate positioning is essential for productivity. Automotive manufacturing systems utilize these ball screws in robotic welding arms, assembly line transporters, and testing equipment that demand high cycle rates and minimal maintenance. Within precision equipment, the BLR SERIES excels in semiconductor manufacturing devices, optical alignment systems, and medical automation, such as imaging scanners and laboratory analyzers, where smooth, vibration-free motion is paramount. By offering a blend of compact design, high performance, and adaptability, THK's BLR SERIES provides a robust solution for advancing automation and precision across diverse sectors.
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