In the core motion hubs of industrial robots, automated assembly lines, and five-axis CNC machine tools, precision crossed roller bearings play a key role in supporting complex spatial loads and ensuring absolute positioning accuracy. As modern equipment evolves towards high dynamic response and extremely high machining accuracy, traditional bearings often fall short when dealing with multi-directional combined forces. Inside robot rotary joints and precision turntables, bearings must not only bear massive radial forces but also cope with frequent overturning moments and axial thrusts. Traditional bearings are highly susceptible to internal clearance changes under eccentric loads, leading to micro-backlash in the end effector, which directly causes trajectory machining errors and robotic arm jitter. Equipment manufacturers urgently need precision crossed roller bearings customized for high-rigidity nodes, featuring zero backlash and multi-directional combined load capacity.

Facing the stringent requirements of aerospace and high-end CNC machine tools, support bearings must not only possess extremely high rotational accuracy but also maintain ultra-low friction fluctuations and deformation when bearing massive overturning moments. Due to the single arrangement of rolling elements, traditional bearings cannot effectively resist complex moments from the outside, easily causing shaking and resonance in turntables. Furthermore, in precision transmission, minute elastic deformation will be amplified into positioning errors at the end. The market urgently demands a crossed roller bearing solution that can break through the bottleneck of multi-directional load-bearing and achieve high rigidity and zero backlash, providing solid protection for the rotary hubs of various high-end precision equipment.

NMT Precision Crossed Roller Bearings are born to conquer the extreme high-rigidity transmission challenges of robots and precision turntables. This series adopts a unique design where cylindrical rollers are arranged vertically crossed at 90 degrees on V-groove raceways, allowing a single bearing to simultaneously bear combined loads in all directions, including radial, axial, and overturning moments. NMT strictly controls the preload of crossed rollers through precise matching of internal spacers and roller dimensions, achieving absolute elimination of internal clearance (zero backlash). This structure endows the bearing with extremely high rigidity and rotational accuracy. Even under drastic load changes, it can maintain micron-level rotational smoothness, completely eliminating backlash in mechanical transmission.

In precision manufacturing and quality control, NMT enforces nearly obsessive standards for the micro-geometry of its crossed roller bearings. Precision rollers undergo strict size and crowning sorting, matched with high-precision V-groove raceway grinding, to ensure absolutely uniform distribution of contact stress. The optimized cage design effectively prevents mutual friction and skewing of crossed rollers, 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 rotary joints, the fourth/fifth axes of CNC machine tools, precision optical turntables, radar antenna rotating bases, rotating rings of medical CT scanners, aerospace precision transmission mechanisms, semiconductor wafer handling equipment, and rotating nodes of high-end automated production lines, satisfying the supporting needs of various high-rigidity, zero-backlash, and multi-directional combined load transmission nodes.

Core Product Advantages

Cylindrical rollers are arranged vertically crossed at 90 degrees, allowing a single bearing to simultaneously bear combined loads in all directions including radial, axial, and overturning moments;

Precision preload and internal zero-clearance design completely eliminate backlash, guaranteeing absolute positioning accuracy of the end effector;

Extremely high structural rigidity and overturning moment resistance maintain micron-level rotational smoothness under drastic load changes, avoiding robotic arm jitter;

Precision rollers and high-precision V-groove raceway grinding ensure absolutely uniform contact stress distribution, endowing the bearing with ultimate rotational accuracy and smoothness;

Optimized cage design effectively guides crossed rollers, avoiding mutual friction and skewing under high-frequency micro-movements, significantly reducing running torque;

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

Compact thin-wall cross-section design significantly reduces weight while providing extremely high load capacity, perfectly adapting to the lightweight requirements of robots;

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

Typical Application Scenarios

Industrial robot rotary joints (J1-J6 axes); Fourth/fifth axis turntables of CNC machine tools; Precision optical and measuring instrument turntables; Radar antenna rotating bases; Rotating rings of medical CT scanners; Aerospace precision transmission mechanisms; Semiconductor wafer handling equipment; Rotating nodes of high-end automated production lines.

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 V-groove raceway grinding, with strict control over raceway surface roughness, angular accuracy, and parallelism. Precision rollers are fully automatically sorted for size, crowning, and weight to ensure consistent load distribution and friction torque within the same bearing set. 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 high-rigidity transmission conditions such as robot joints and precision turntables, providing reliable support solutions for high-end precision equipment.

Product Series

Inner ring split crossed roller bearings, outer ring split crossed roller bearings, integral crossed roller bearings, crossed roller bearings with mounting holes; 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, CNC machine tools, and precision turntables—where multi-directional combined loads are complex, backlash requirements are stringent, and high-rigidity demands are strong—NMT continuously optimizes crossed roller geometric design, precision preload technology, and micro-consistency manufacturing processes. This effectively solves fatal defects of traditional bearings such as easy backlash generation under complex loads, insufficient rigidity, and large friction fluctuations. It significantly enhances the positioning accuracy and dynamic response of robot rotary joints, extends the service life of core components under extreme conditions, and helps high-end manufacturing enterprises break through high-rigidity precision transmission bottlenecks to seize the global precision intelligent manufacturing market.