Every precise movement of an industrial robot depends on the precision coordination of its internal transmission system. From the smooth slewing of the base to the flexible rotation of the wrist and the precise gripping of the fingers, the smooth motion of each joint relies on a set of high-performance bearings for load carrying and transmission. Robot bearings need to provide high-rigidity support within limited space, maintain precision during high-frequency reciprocating motion, and sustain reliability during long-term continuous operation.

 

NMT Industrial Robot Bearings, with high precision, high rigidity, and compact lightweight as core characteristics, provide precision transmission support for robot joints and automation equipment. Equal-section thin-section bearings, crossed roller bearings, angular contact ball bearings, and four-point contact ball bearings work together to form a comprehensive robot bearing fitting system, adapting to the base, shoulder, elbow, wrist, and finger joints of industrial robots, as well as collaborative robots, SCARA robots, parallel robots, and other types.

 

High precision is the primary requirement for robot bearings. The repeat positioning accuracy of a robot directly depends on the rotational accuracy of its joint bearings. Through ultra-precision grinding and precision grading, NMT achieves sub-micron raceway accuracy with stable rotational precision control. Under high-speed motion and frequent start-stop conditions, bearings maintain consistent positioning accuracy, ensuring uniformity in robot operations.

 

High rigidity and compact lightweight are balanced in NMT robot bearings. Crossed roller bearings achieve line-contact high-rigidity load carrying with orthogonally arranged cylindrical rollers, with thin-section hollow structures providing stable support within limited space. Equal-section thin-section bearings with constant cross-section design enable all joints to share the same thin-section structure, further compressing overall machine weight and volume. Angular contact ball bearings, with precise contact angle design, provide high-precision combined-load capacity within limited installation space. Four-point contact ball bearings carry multi-directional combined loads—radial, axial, and tilting moments—with a single bearing, further simplifying structure and saving space.

 

Low friction torque and long life are the reliable guarantees of NMT robot bearings. Under high-frequency reciprocating motion of robots, bearing friction torque directly affects equipment energy consumption and heat generation. Through superfinished raceway processing and precision rolling element matching, NMT controls friction torque at ideal levels, resulting in moderate temperature rise and reduced energy consumption. Optimised lubrication solutions maintain stable performance during long-term continuous operation, reducing maintenance frequency.

 

NMT robot bearings adopt international standard external dimensions and are available in P5, P4, and P2 high-precision grades to suit different precision requirements. Open and sealed configurations, as well as special clearance and preload solutions, are available.

 

Core Product Advantages

High precision—ultra-precision grinding and precision grading achieving sub-micron raceway accuracy with stable rotational precision control, ensuring robot repeat positioning accuracy;

 

Crossed roller bearings—orthogonally arranged cylindrical rollers with line-contact high-rigidity load carrying, thin-section hollow structure, adapting to compact robot joint spaces;

 

Equal-section thin-section bearings—constant cross-section design with cross-section unchanged as bore diameter increases, allowing all joints to share thin-section structure for overall lightweighting;

 

Angular contact ball bearings—precise contact angle design providing high-precision combined-load capacity within limited space;

 

Four-point contact ball bearings—Gothic arch raceway with single bearing carrying radial, axial, and tilting moment loads, simplifying structure and saving space;

 

Low friction torque—superfinished raceways paired with precision rolling elements for low friction, moderate temperature rise, reduced energy consumption and heat generation;

 

Optimised lubrication solutions—adapting to long-term continuous robot operation, reducing maintenance frequency and extending service life;

 

Multiple precision grades—P5, P4, P2 available, suiting robots with different precision requirements.

 

Typical Applications

Industrial robot bases—four-point contact ball bearings and crossed roller bearings providing high-rigidity slewing support; Industrial robot shoulders and elbows—equal-section thin-section bearings and crossed roller bearings adapting to large-hollow compact structures, carrying combined loads; Industrial robot wrists and fingers—equal-section thin-section bearings and angular contact ball bearings providing high-precision lightweight transmission; Collaborative robots—thin-section bearings and crossed roller bearings ensuring safe lightweight joint motion; SCARA robots—angular contact ball bearings and thin-section bearings ensuring high-speed high-precision planar motion; Parallel robots—high-precision angular contact ball bearings ensuring positioning accuracy under high-speed motion; Robot reducers—precision angular contact ball bearings and cylindrical roller bearings supporting long-term stable reducer operation.

 

Quality Assurance

NMT robot bearing quality assurance covers the entire process from raw materials to finished products. High-purity alloy steel undergoes spectral analysis, inclusion rating, and grain size testing upon incoming inspection. Precision forging and gradient heat treatment ensure ring dimensional stability and material microstructure uniformity. Raceways undergo precision grinding and superfinishing with surface roughness consistently controlled to Ra ≤ 0.04μm and shape accuracy reaching sub-micron levels. Rolling elements undergo multi-stage grinding and precision grading with good dimensional consistency. Roundness and wall thickness deviation of thin-section rings are strictly controlled. Assembly takes place in clean environments with precise clearance and preload control. Finished products pass torque, vibration, rotational accuracy, and run-in tests, with complete data archived. Rust-preventive packaging ensures flawless delivery.

 

Product Range

Equal-section thin-section bearing series—6700 and 6800 series, constant cross-section lightweight compact, adapting to various robot joints; Crossed roller bearing series—RB, RE, RU types, line-contact high rigidity, thin-section hollow design; Angular contact ball bearing series—high-precision combined load capacity, 15° and 25° contact angles available; Four-point contact ball bearing series—Gothic arch raceway, single bearing carrying combined loads; P5, P4, P2 precision grades available; Open and sealed configurations available; Special clearance and preload solutions available.

 

Brand Strength

NMT has been dedicated to the research, development, and manufacturing of precision bearings for over a decade. As a core category within the NMT product portfolio, industrial robot bearings serve industrial robots, collaborative robots, SCARA robots, automation equipment, and other fields with high precision, high rigidity, and compact lightweight characteristics. The company operates complete precision machining production lines, professional testing laboratories, and an experienced technical team.

 

NMT industrial robot bearings deeply integrate high-precision manufacturing processes with robot application requirements, continuously optimising across the three dimensions of high precision, high rigidity, and compact lightweight. Every precise movement of a robot depends on reliable bearing support. With professional capability and quality commitment, NMT provides trustworthy precision transmission bearing products for industrial robots and automation equipment.