Joint parts of industrial robots, CNC rotary tables, optical inspection platforms and automatic indexing devices impose extremely strict requirements on precision and rigidity of supporting components. Traditional combined structures composed of separated radial bearings and thrust bearings feature complicated assembly processes. Coaxiality is hard to control accurately, and massive axial installation space is occupied, making miniaturization and lightweight design difficult for complete equipment. Ordinary ball bearings adopt point contact mode with limited load capacity. Elastic deformation easily occurs under overturning moment, resulting in positioning accuracy degradation, which fails to meet working conditions of precision indexing and high-precision rotary positioning. Many high-end automatic equipment need to reduce overall dimensions while enabling bearings to bear radial loads, axial loads and overturning moments simultaneously. Traditional combined bearing schemes hardly balance space limitation and comprehensive load performance. Meanwhile, precision machining and visual inspection equipment operate continuously for a long period. Bearings are required to own tiny rotational clearance and stable repeated positioning accuracy to avoid rapid precision attenuation after long-term operation. NMT Cross Roller Bearings adopt staggered roller arrangement. Single bearing can withstand multi-directional composite loads with compact structure and outstanding rigidity, simplifying design of precision rotary mechanisms and widely applied to various high-end intelligent manufacturing equipment.

With the iterative upgrading of intelligent manufacturing equipment toward miniaturization and high precision, multi-joint manipulators, rotary tables of five-axis machining centers and visual inspection rotary platforms continuously pursue higher operation accuracy and more compact assembly structures. Support schemes with two independent bearings bring large accumulated assembly errors. Clearance tends to change under long-term alternating loads, and repeated positioning accuracy drifts after frequent start-stop cycles, directly affecting machining precision of workpieces and accuracy of inspection data. Conventional large rotary support bearings own large outer diameter, unsuitable for medium and small-sized precision rotary modules and lightweight robot joint structures. Although operating environments of precision equipment contain limited dust, tiny metal debris easily invades bearing raceways and causes roller wear, shortening bearing service life directly. Many automatic equipment manufacturers prefer integrated supporting components to reduce part quantity, simplify assembly procedures and lower precision errors caused by manual assembly. NMT Precision Cross Roller Bearings arrange cylindrical rollers in 90-degree staggered layout, capable of bearing radial force, axial force and overturning moment at the same time. Ultra-high rigidity and rotary precision are realized within limited installation space, perfectly matching design demands of precision CNC and robot equipment.

Cylindrical rollers inside NMT Precision Cross Roller Bearings are arranged perpendicularly in staggered form. The unique structure enables single bearing to withstand radial loads, bidirectional axial loads and overturning moments simultaneously, greatly simplifying rotary support mechanisms without combining multiple sets of bearings. Line contact exists between rollers and raceways with larger contact area, excellent rigidity and tiny elastic deformation under force, maintaining stable positioning accuracy for long-term operation. Inner and outer rings are optimized in design with greatly reduced axial thickness, effectively saving axial installation space and facilitating lightweight and miniaturized transformation of mechanical structures. Products cover multiple precision grades including open type and sealed type. Sealed versions are equipped with dust-proof seals to block fine dust and metal debris invading raceways and protect rolling contact surfaces. Raceways are processed via ultra-precision grinding with strictly controlled clearance range. Standard clearance and slight preload specifications are optional according to working conditions to restrain rotary shake and improve positioning stability. Widely used in industrial robot joints, rotary tables of CNC machine tools, optical inspection rotary platforms, automatic indexing plates, laser processing rotary modules and precision handling devices for semiconductor industry.

Inner and outer rings are made of high-purity carburized bearing steel treated by overall quenching and low-temperature tempering. Sufficient surface hardness and favorable core toughness deliver outstanding impact resistance and fatigue resistance. Raceways go through superfinishing to lower friction coefficient, guarantee smooth rotation and reduce temperature rise. Cylindrical rollers pass strict dimensional sorting with high dimensional consistency and uniform load distribution. Seals are made of wear-resistant and oil-resistant synthetic rubber, adapting to working media such as cutting oil and lubricating grease. All finished products pass radial runout, axial runout and rotary torque inspection. Products with excessive precision error and unsmooth rotation are eliminated to ensure unified and stable precision indicators among batches.

Complete precision specification series adapt to all kinds of precision rotary mechanisms of industrial robots, CNC machining equipment and optical testing instruments, supplying compact high-precision rotary support solutions for working conditions with multi-directional composite loads.

Core Product Advantages

Rollers arranged at 90 degrees, single bearing bears radial, axial and overturning composite loads simultaneously without assembly of multiple bearing sets;

Line contact rolling structure delivers strong support rigidity and tiny deformation under load, ensuring high-precision positioning operation of equipment for long time;

Ultra-thin integrated structure with compact axial size, greatly saving installation space and facilitating lightweight and miniaturized mechanical design;

Optional slight preload structure effectively restrains rotary clearance and shake, significantly improving repeated positioning accuracy;

Ultra-precision grinding of raceways realizes low rotary runout and uniform stable torque without creeping during low-speed operation;

Optional multiple sealing structures prevent dust and metal debris from invading raceways, slow down wear and extend bearing service life;

Multiple precision grades available, standard, precision and ultra-precision levels cover different accuracy demands of automatic equipment;

Integrated component reduces assembly parts, lowers accumulated assembly errors and shortens equipment assembly working hours.

Typical Application Scenarios

Joint parts of multi-joint industrial robots; precision rotary tables of CNC machine tools; rotary platforms for optical inspection and visual scanning; rotary modules for laser cutting and laser welding; automatic precision indexing plates; rotary mechanisms for workpiece handling of semiconductor equipment; support units for swing axes of miniature five-axis equipment.

Quality Assurance

NMT Precision Cross Roller Bearings adopt high-quality special alloy steel for bearings. Sampling inspection on metallographic structure and hardness is carried out when raw materials arrive. Inner and outer rings go through forging, stabilizing heat treatment, repeated precision grinding and superfinishing. Contour precision and surface finish of raceways are strictly controlled. Cylindrical rollers are manufactured via high-precision cold heading and grinding processes with dimensional grouping matching to guarantee uniform load distribution. Sealing components own oil resistance, wear resistance and anti-aging performance, adapting to workshop environment with splashing cutting fluid and fine metal dust. All components are fully deburred and inspected for surface microcracks and collision damage via flaw detection. Defective workpieces are completely eliminated. After assembly, rotary torque, end face runout and radial runout indicators of each bearing are tested one by one. Samples are regularly selected for long-term alternating load durability tests. Defective goods are sorted separately. Every cross roller bearing is guaranteed to own smooth rotation, lasting precision and stable rigidity, supplying reliable rotary supporting parts for high-end precision automatic equipment.

Product Range

Open cross roller bearings, single-side sealed cross roller bearings, double-side sealed cross roller bearings. Model selection based on equipment precision grade, dust-proof conditions and load working conditions.

Brand Strength

NMT devotes to R&D and manufacturing of precision rotary bearings. Targeting demands of high precision, high rigidity and compact installation from industrial robots and CNC precision equipment, NMT continuously optimizes raceway processing technology, roller precision and preload structural design. The bearings effectively mitigate problems including precision attenuation after long-term operation, uneven roller wear and low-speed creeping. NMT helps intelligent manufacturing equipment manufacturers simplify structural design, improve equipment positioning accuracy and cut replacement costs of later maintenance.