Industrial robots, CNC rotary tables and automatic rotary platforms operate under complex load conditions, subjected to radial force, bidirectional axial thrust and continuous overturning moment simultaneously. Ordinary single-row ball bearings can only bear axial load in one direction and have to be installed in pairs, occupying extra assembly space, complicating installation and leading to unbalanced preload control. Precision rotary equipment has strict requirements on rotation smoothness and positioning accuracy. Excessive friction will increase energy consumption and positioning deviation. Machinery is designed toward lightweight and compact layout, leaving limited space for transmission components, while traditional paired bearings cannot meet layout requirements. Many rotary mechanisms start and stop frequently under alternating loads, resulting in clearance growth and accuracy degradation, which damages overall equipment performance. The market demands four-point contact ball bearings capable of bearing composite loads individually, featuring compact structure, low friction and high precision.

NMT Four-Point Contact Ball Bearings adopt gothic arch raceway design. Steel balls form four contact points with raceways. A single bearing can independently withstand radial loads, bidirectional axial loads and overturning moments. Paired bearing installation is no longer required, significantly reducing axial occupied space. Raceways are ultra-precisely ground to achieve smooth and even contact tracks, lower rolling friction and guarantee smooth rotation to cut driving load. Manufactured from high-purity bearing steel with precise isothermal heat treatment, the bearings enhance contact surface anti-fatigue capacity and retain original accuracy under frequent alternating loads over long service periods. Multiple preload options are available to eliminate rotary clearance according to accuracy requirements. Sealed variants prevent dust invasion into raceways, suitable for dusty workshop environments. A complete range of standardized dimensions supports convenient replacement for new and old rotary automation equipment.

Open and sealed structures are available. Selection can be made based on precision grade, load condition, operating environment and rotating speed for all kinds of precision rotary transmission mechanisms.

Core Product Advantages

Four-point contact gothic arch raceway enables single bearing to withstand radial loads, bidirectional axial loads and overturning moments without paired assembly;

Ultra-precisely ground raceways reduce rolling friction, ensure smooth rotation, lower driving torque and save energy consumption;

Compact structure greatly saves axial installation space, supporting lightweight design of robots and CNC rotary tables;

Premium bearing steel with stabilized heat treatment delivers good resistance to alternating load fatigue and minor accuracy loss during long-term service;

Controllable preload eliminates rotary clearance to guarantee positioning accuracy and repetitive rotary precision for precision equipment;

Optional dust-proof sealing structure prevents dust contamination, extends lubrication intervals and adapts to complicated conditions of automatic production lines.

Typical Application Scenarios

Rotary joints and manipulator rotary units of industrial robots; CNC rotary tables and indexing plates for machining centers; automatic production line rotary platforms and turnover tooling; light-duty slewing support equipment; precision rotary bases for testing instruments; precision rotary mechanisms for semiconductor automation equipment.

Quality Assurance

NMT Four-Point Contact Ball Bearings are produced under full-process quality control complying with precision rotary bearing standards. Raw materials pass ultrasonic flaw inspection. Inner and outer ring raceways receive ultra-precision grinding. All finished bearings pass rotary precision inspection, friction torque testing and composite load endurance testing to guarantee stable long-term operation under precision alternating load conditions. Complete specifications and reliable interchangeability support continuous supply for manufacturers of automation, machine tool and robot equipment.

Product Range

Open basic models and double-side dust-sealed models are available. Professional selection guidance based on precision grade, composite load, rotating speed and working environment is offered.

Brand Strength

NMT devotes itself to research and manufacturing of precision bearings. Solving industry challenges including complex loads, limited installation space, high precision & low friction requirements and frequent alternating loads of robots and CNC rotary tables, NMT continuously optimizes raceway profile machining technology, supplying integrated composite-load four-point contact ball bearing solutions for precision automated rotary equipment.