In the joint and rotary transmission systems of industrial robots, precision automation equipment, and high-end medical devices, crossed roller bearings play a key role in supporting multi-directional loads and ensuring extremely high positioning accuracy. As robots iterate towards lightweight and high dynamic response, traditional bearings often fall short when dealing with complex stresses. During frequent start-stop and direction changes of robot joints, the internal clearance in traditional bearings leads to micro-backlash, directly causing inaccurate positioning of the end effector. Meanwhile, in pursuit of ultimate compact design, the installation space left for bearings inside the equipment is extremely compressed, making it difficult for traditional bearings to balance high rigidity and high precision in confined spaces. Equipment manufacturers urgently need a compact crossed roller bearing customized for robot joints, featuring zero backlash and ultra-high rigidity.

Facing the stringent requirements of collaborative robots, semiconductor manufacturing equipment, and precision optical inspection platforms, support bearings must not only withstand complex loads such as extreme radial, axial, and overturning moments but also maintain micron-level repeatability positioning accuracy during long-term high-frequency operation. Due to the single arrangement of internal rolling elements, traditional bearings cannot effectively resist external overturning moments, easily causing vibration and resonance in robotic arms. Furthermore, in precision assembly, any minute elastic deformation will be amplified into system errors. The market urgently demands a crossed roller bearing solution that can break through space limitations and achieve multi-directional load-bearing with ultimate rigidity, providing solid protection for the joint transmission of various high-end precision equipment.

NMT Precision Crossed Roller Bearings are born to conquer the extreme transmission challenges of robot joints and precision rotary tables. This series adopts a unique 90° crossed cylindrical roller design, allowing a single bearing to simultaneously withstand loads in all directions, including radial, axial, and overturning moments. NMT completely eliminates internal clearance through precise matched preload technology, achieving zero-backlash operation, endowing the robotic arm with ultra-high system rigidity, and effectively suppressing vibration and resonance during high-speed movement. For the compact space of robot joints, NMT adopts an equal-section thin-wall design, significantly reducing the cross-sectional height and weight of the bearing while maintaining excellent load capacity and deformation resistance.

In precision manufacturing and quality control, NMT enforces micron-level standards for every detail of its crossed roller bearings. Precision rollers undergo strict size and crowning sorting, matched with high-precision raceway grinding, to ensure absolutely uniform distribution of contact stress. The optimized cage or spacer design effectively prevents mutual friction and skewing of rollers during high-speed operation, significantly reducing running torque. For the long-life requirements of robot joints, NMT fills special long-life grease and adopts a high-seal structure to effectively prevent grease loss and external impurity intrusion. All finished products are assembled in a constant-temperature cleanroom and undergo 100% rotational accuracy, friction torque, and rigidity testing. Any products with minute defects are eliminated, ensuring high consistency and high reliability of batch products.

With rich specifications, these bearings are widely used in industrial robot joints (such as RV reducers, harmonic reducers), automated rotary tables, semiconductor wafer handling manipulators, precision optical instrument gimbals, medical CT rotating rings, and radar antenna elevation mechanisms, satisfying the supporting needs of various high-rigidity, zero-backlash, and compact transmission nodes.

Core Product Advantages

Unique 90° crossed roller arrangement allows a single bearing to simultaneously withstand composite loads of radial, axial, and overturning moments, offering excellent multi-directional load capacity;

Precision matched preload technology completely eliminates internal clearance, achieving zero-backlash operation and endowing the robotic arm with ultra-high system rigidity;

Equal-section thin-wall compact design significantly reduces cross-sectional height and weight, perfectly adapting to the confined installation space of robot joints;

Precision rollers and high-precision raceway grinding ensure uniform contact stress distribution and micron-level repeatability positioning accuracy, ensuring absolute precision of the end effector;

Optimized spacer/cage design effectively prevents roller skewing and mutual friction, significantly reducing running torque and heat generation;

Special long-life grease and high-seal structure prevent grease loss and impurity intrusion, achieving ultra-long maintenance-free life for robot joints;

Extremely smooth operation with low vibration and low noise effectively suppresses resonance during high-speed movement, improving the dynamic response performance of the robotic arm;

Full life-cycle reliability design significantly reduces maintenance frequency of precision equipment, improving overall operational efficiency and product yield.

Typical Application Scenarios

Industrial robot joints (RV/harmonic reducers); Automated precision rotary tables; Semiconductor wafer handling manipulators; Precision optical instrument gimbals; Rotating rings of medical CT scanners; Elevation and rotation mechanisms of radar antennas; Rotating pivots of precision measuring instruments; Indexing heads of high-end CNC machine tools.

Precision Quality Assurance

NMT Precision Crossed Roller Bearings use high-purity vacuum-degassed bearing steel as core raw materials, subject to strict incoming material and purity inspections. After precision turning, rings undergo special heat treatment and high-precision raceway grinding, with strict control over raceway surface roughness, flatness, and parallelism. Precision rollers are fully automatically sorted for size and crowning to ensure consistent load distribution and friction torque within the same bearing set. Spacers/cages and special grease are simultaneously inspected to eliminate raw material defects. All components are assembled in a constant-temperature dust-free workshop. Finished products undergo 100% rotational accuracy, friction torque, and rigidity testing. Unqualified products are completely rejected, ensuring the ultimate performance of batch products under robot joint and precision transmission conditions, providing reliable support solutions for high-end precision equipment.

Product Series

Inner ring split crossed roller bearings, outer ring split crossed roller bearings, ultra-thin section crossed roller bearings; Selection is based on installation space, load direction, rigidity requirements, and backlash levels.

Brand Strength

NMT is deeply engaged in the R&D and manufacturing of precision crossed roller bearings. Targeting industry pain points in industrial robots, automation equipment, and precision instruments—where space is extremely compact, multi-directional loads are complex, and rigidity requirements are stringent—NMT continuously optimizes crossed roller geometric design, preload control technology, and thin-wall manufacturing processes. This effectively solves fatal defects of traditional bearings such as large backlash, insufficient rigidity, and easy vibration. It significantly enhances the positioning accuracy and dynamic response of robot joints, extends the service life of core components under extreme conditions, and helps high-end manufacturing enterprises break through precision joint transmission bottlenecks to seize the global precision intelligent manufacturing market.