NMT Ltd.
Corporate Communications Department
NMT Crossed Roller Bearings Orthogonal High Rigidity Precision Bearings
As robots evolve from automated machinery to intelligent terminals, the physical attributes of joints often become the primary ceiling on performance. Within the joints of collaborative robots, medical assistance arms and precision positioning stages, servo motors, harmonic reducers and encoders already occupy every millimeter of space. Conventional ball bearings rely on point contact for load transmission, which leads to localized deformation under heavy loads or tilting moments—resulting in end-effector vibration and trajectory drift. Many automation engineers have experienced this: a newly assembled robot achieves perfect precision, but after thousands of operating hours, trajectory drift emerges, eventually forcing speed reduction—and the root cause often lies in early micro-wear within the bearings.
Japan NMT precision crossed roller bearings address this fundamental yet critical issue. NMT adopts an orthogonal arrangement of cylindrical rollers, expanding contact from point to line and distributing stress evenly across the raceway surface like flowing water. Even when a robotic arm extends at full speed and stops abruptly, the joint maintains geometric stability, transmitting no unnecessary vibration to the end effector. Meanwhile, NMT crossed roller bearings deliver reassuring rigidity with an extremely thin cross-section, leaving an unobstructed hollow passage through the center—cables and air tubes run straight through, eliminating the risk of fatigue fracture caused by repeated bending.
Reasons for selecting NMT crossed roller bearings:
Orthogonally arranged cylindrical rollers with line-contact load distribution deliver rigidity several times that of ball bearings of equivalent size
Precisely controlled roller crowning and raceway surface integrity effectively flatten stress peaks
Rotational precision remains stable even after millions of alternating load cycles, with no gradual clearance enlargement
Ultra-thin cross-section dramatically saves internal joint space
Hollow passage design allows cables and tubes to pass straight through, eliminating bending fatigue risks
Smooth rotation without jamming, with excellent vibration suppression and temperature rise control
Stable rigidity throughout the entire lifecycle, eliminating the need for mid-course recalibration
Compact structure suits collaborative robots, medical assistance arms and other space-sensitive equipment
These advantages establish NMT crossed roller bearings as the preferred choice for robot joints, CNC rotary tables and precision positioning stages, perfectly matching demanding conditions of high rigidity, high precision and space constraints.
Application scenarios
Industrial robot wrists and shoulder joints, collaborative robot joints, medical assistance manipulators, CNC machine rotary tables, precision positioning stages, semiconductor wafer handling robots, power battery stacking equipment, automotive body-in-white welding lines.
Precision manufacturing
Produced according to Japanese industrial standards, NMT crossed roller bearings adopt high-purity bearing steel subjected to precision forging, raceway superfinishing, roller crowning optimization, orthogonal assembly, preload precision adjustment, dynamic torque screening, rotational accuracy inspection and durability fatigue testing—ensuring every product delivers high rigidity, precision and smooth operation.
Product range
Standard crossed roller bearings, thin-section crossed roller bearings, high-rigidity reinforced crossed roller bearings, hollow-through crossed roller bearings, high-speed precision crossed roller bearings, corrosion-resistant stainless steel crossed roller bearings and custom non-standard bearings.
Global industrial service
Japan NMT supplies high-quality crossed roller bearings to global robot manufacturers, CNC equipment providers and precision automation firms, empowering advanced global machinery with orthogonal precision engineering and rigidity retention throughout the full lifecycle.