In every joint of an industrial robot, bearings endure complex and demanding load conditions. Base joints bear the weight of the entire robot and end loads, wrist joints complete precise posture adjustments at high speeds, and waist slewing joints maintain stable positioning accuracy through frequent rotation. Conventional ball bearings, when facing the combined effects of radial loads, axial loads and overturning moments, often require multiple bearing sets to meet requirements——consuming valuable joint space while increasing assembly complexity and cumulative tolerances.

 

Japan NMT crossed roller bearings are specialized products developed specifically for the extreme requirements of industrial robot joints for high rigidity, high precision and compact design. The core design features cylindrical rollers arranged orthogonally at 90° between inner and outer rings. This unique structure enables NMT crossed roller bearings to simultaneously withstand radial loads, bidirectional axial loads and overturning moments, with rigidity several times that of ball bearings of equivalent size.

 

NMT crossed roller bearings provide reassuring support rigidity with extremely thin cross-sections. A single bearing can accomplish what traditionally required multiple bearing sets. The axial space saved can be allocated to cables, air tubes or even force-torque sensors, enabling robot bodies to maintain high rigidity while possessing more powerful end integration capabilities.

 

NMT crossed roller bearings rigorously control roller crowning profiles and raceway surface integrity to effectively flatten stress peaks in rolling contact areas. Raceways undergo nanometer-level superfinishing to achieve surface roughness below Ra0.04μm, and rolling elements undergo ultra-high-precision grading screening to maintain micron-level rotational precision. Bearings feature precision preload settings to maintain constant high rigidity across the full load range, eliminating positioning drift during direction changes.

 

NMT crossed roller bearings feature unobstructed hollow passages through the center. Cables and air tubes pass straight through, completely eliminating the risk of fatigue fracture from repeated bending. Bearings utilize high-strength engineering plastic or copper alloy cages, optimized through topology design to maintain precise rolling element guidance under high-speed rotation and impact loads.

 

Why choose NMT industrial robot crossed roller bearings?

 

Orthogonally arranged cylindrical rollers simultaneously withstand radial, axial and overturning combined loads

 

Rigidity several times that of ball bearings of equivalent size, maintaining micron-level rotational precision under heavy loads

 

Thin-wall compact design significantly saves joint axial space

 

Hollow passage design allows cables and tubes to pass straight through, eliminating bending fatigue risks

 

Nanometer-level superfinished raceways with surface roughness below Ra0.04μm

 

Ultra-high-precision graded rolling elements for long-term stable rotational precision

 

Precision preload settings for constant high rigidity and zero-backlash across full load range

 

Passed rigorous durability and precision testing for six-axis robots, collaborative robots and precision rotary equipment

 

These performance advantages establish NMT industrial robot crossed roller bearings as the reliable precision components for six-axis robot bases, wrists, waist joints and precision rotary tables.

 

Application scenarios

 

Six-axis industrial robot base and shoulder joints

 

Industrial robot wrist and waist slewing joints

 

Collaborative robot joint rotational support

 

CNC machine fourth and fifth-axis rotary tables

 

Precision rotary tables and indexing devices

 

Semiconductor manufacturing equipment precision positioning stages

 

Medical robot joints and manipulator arms

 

Automated assembly and inspection rotary equipment

 

Precision manufacturing

 

Produced according to robotics industry standards and precision bearing manufacturing specifications, NMT industrial robot crossed roller bearings utilize high-purity bearing steel or case-hardening steel materials, processed through vacuum degassing refining, nanometer-level raceway superfinishing, ultra-high-precision rolling element grading screening, topology-optimized cage forming, precision preload setting, rotational accuracy verification, rigidity testing and durability validation——ensuring every product delivers high rigidity, high precision and long service life.

 

Product range

 

Standard crossed roller bearings (integral inner ring/split outer ring)

 

High-rigidity crossed roller bearings (integral inner and outer rings)

 

Thin-section crossed roller bearings

 

Hollow-through crossed roller bearings

 

High-speed precision crossed roller bearings

 

Corrosion-resistant stainless steel crossed roller bearings

 

Custom non-standard crossed roller bearings

 

Global industrial service

 

Japan NMT supplies high-quality crossed roller bearings to global industrial robot manufacturers, automation system integrators and precision machinery companies, empowering the development of global smart manufacturing and automation with high-rigidity high-precision long-life precision engineering and long-term stable joint transmission performance.