Industrial robot joints, reducer output shafts, CNC rotary tables, precision rotary platforms and medical scanning equipment are subjected to radial loads, axial loads and tilting moments simultaneously during operation, forming multi-directional combined load conditions. Installation space is often limited and compact, requiring bearings to provide high rigidity and high rotational accuracy within the smallest possible cross-sectional height. Ordinary ball bearings rely on point contact for load carrying. When facing tilting moments, the contact area is extremely small, making localized deformation likely and leading to reduced rotational accuracy. Using multiple sets of bearings to share loads would significantly increase axial dimensions and structural complexity of the equipment.

 

Most precision rotating equipment requires long-term continuous operation, placing extremely high demands on bearing life and reliability. Under alternating loads, clearance in conventional bearing structures gradually increases, causing axial displacement and radial runout in rotary platforms that directly affect machining accuracy and positioning precision. Frequent start-stop cycles require stable starting and running torque, which directly impacts equipment response speed and energy consumption. The industry urgently requires bearings that can simultaneously withstand multi-directional combined loads in compact spaces, maintain high rotational accuracy over the long term, and offer high rigidity and long service life.

 

NMT Precision Crossed Roller Bearings employ a cylindrical roller orthogonal dense arrangement, upgrading contact between rolling elements and raceways from point contact to line contact, uniformly distributing load stress across the raceway surface. The bearings can simultaneously withstand radial loads, axial loads and tilting moments. The compact cross-sectional height saves installation space and enables equipment miniaturization and lightweight design. Rollers are arranged at 90°交错 in V-shaped grooves. Inner and outer rings are separable for convenient installation and maintenance.

 

Rollers are precision-machined from high-purity bearing alloy steel, subject to strict micron-level dimensional sorting, with surfaces superfinished. By strictly controlling roller crowning curves and raceway surface integrity, NMT effectively flattens stress peaks in rolling contact zones. Shaft washers and housing washers undergo forging, precision grinding and superfinishing. All components receive quenching heat treatment and long-term low-temperature stabilization processing to achieve sufficient surface hardness while maintaining core toughness, balancing wear resistance and impact resistance. High-precision solid cages accurately separate each roller to prevent mutual collision, extrusion and tilting, reserving sufficient lubrication space to extend maintenance intervals.

 

NMT adopts flexible pocket cage structures and micron-level spherical treatment on roller end faces, enabling smooth contact re-establishment during direction changes. Through strict roller grading and ring selection, factory clearance dispersion is compressed to extremely narrow ranges, ensuring high consistency. Products adopt international standard dimensions with excellent interchangeability. Comprehensive specifications cover bore diameters from 50mm to over 1000mm, widely applied to industrial robot joints, reducers, CNC rotary tables, precision rotary platforms, medical CT scanner gantries, astronomical observation equipment and various precision rotating devices. The bearings adapt to continuous rotation, frequent start-stop, load fluctuation and complex conditions with tilting moments.

 

Core Product Advantages

Orthogonal dense cylindrical roller structure upgrades contact from point to line, simultaneously withstanding radial loads, axial loads and tilting moments, with one bearing replacing multiple combinations;

 

Compact cross-sectional height design saves installation space and facilitates equipment lightweighting and miniaturization;

 

Separable inner and outer rings enable convenient installation, maintenance and reduced assembly difficulty;

 

Line contact between rollers and V-shaped grooves ensures even load distribution, strong tilting resistance and stable rotational accuracy;

 

Flexible pocket cages with micron-level spherical treatment on roller end faces enable smooth contact re-establishment during direction changes, avoiding torque fluctuation;

 

Factory clearance dispersion compressed to extremely narrow range through strict roller grading and ring selection, ensuring high consistency;

 

High-purity bearing steel with sufficient stabilization treatment prevents micro-warpage from residual stress release during long-term service;

 

Standard external dimensions ensure great interchangeability to replace imported counterparts and lower procurement costs.

 

Typical Application Scenarios

Industrial robot joints (wrist, arm, base of six-axis robots); Reducer output shaft support; CNC rotary tables and indexing plates; Precision rotary platforms and direct-drive motors; Medical CT scanner gantries and gamma knife rotation mechanisms; Astronomical telescope elevation and azimuth drives; Radar antenna rotation mechanisms; Semiconductor inspection equipment precision positioning stages.

 

Quality Assurance

NMT Precision Crossed Roller Bearings are manufactured with premium refined bearing alloy steel. Incoming inspection includes chemical composition testing and metallurgical sampling inspection to eliminate material defects at source. Roller blanks are processed by precision rolling and cutting, followed by sequential rough grinding, finish grinding and superfinishing with strict control over roller profile precision and surface roughness. Stress relief annealing is conducted after rough machining of shaft washer and housing washer forgings to eliminate internal stress, followed by quenching and low-temperature stabilization treatment to reduce dimensional variation risks under long-term heavy loads.

 

All rollers pass flaw detection screening to remove parts with cracks and dents. All components go through high-pressure cleaning and dust-free drying before assembly in clean workshops. Appropriate grease is filled according to practical working conditions. After assembly, finished bearings undergo combined load endurance testing, rotational accuracy inspection, friction torque testing and temperature rise testing. All unqualified products are eliminated completely to guarantee stable and consistent performance of bulk goods and supply reliable combined load bearing solutions for precision rotating equipment.

 

Product Range

Crossed roller bearing standard series (RA/RB/RE/RU types). Selection is based on bore diameter, load rating and precision grade. P5 and P4 precision grades available as options.

 

Brand Strength

NMT focuses on R&D and manufacturing of precision crossed roller bearings. Targeting common industry challenges of combined loads, compact spaces, long-term precision retention and frequent start-stop in industrial robots, precision rotary platforms and medical equipment, NMT continuously optimizes roller structure, raceway design and heat treatment technology. By strictly controlling roller crowning curves and raceway surface integrity, NMT effectively flattens stress peaks in rolling contact zones. Even after millions of alternating load cycles, bearing rotational accuracy remains stable and clearance does not gradually expand. NMT adopts flexible pocket cage structures and micron-level spherical treatment on roller end faces, enabling smooth contact re-establishment during direction changes. Through strict roller grading and ring selection, factory clearance dispersion is compressed to extremely narrow ranges. The bearings effectively solve common defects of ordinary ball bearings such as insufficient rigidity and load capacity, and structural complexity of combined bearing assemblies causing precision loss. NMT products reduce risks of bearing failure on precision equipment, improve long-term operational stability and reliability, and support stable continuous operation of various precision rotating devices.