Industrial robot joints, automatic rotary tables, construction machinery rotary mechanisms and small slewing devices simultaneously bear radial loads, bidirectional axial loads and overturning moments during operation. Ordinary deep groove ball bearings can only withstand unidirectional axial force. Paired angular contact ball bearings require complicated assembly and precise preload adjustment, failing to meet the lightweight and compact design requirements of rotary units. Traditional crossed roller bearings have high costs and large overall dimensions, which are not suitable for medium and small lightweight rotary equipment.

Rotary mechanisms need flexible low-speed swing and intermittent rotation with stable friction torque and controllable rotary clearance. Many automatic equipment pursue lightweight design with limited installation space, while requiring high rigidity and positioning accuracy. Environmental impurities such as dust and moisture easily invade bearings and cause rolling element wear, reducing rotary precision. The market demands four-point contact ball bearings with compact structure and composite load capacity for medium and small rotary mechanisms.

NMT Four-Point Contact Ball Bearings adopt a unique design to bear bidirectional axial force by single bearing. One single bearing can sustain radial loads, bidirectional axial loads and overturning moments simultaneously, replacing two sets of paired angular contact ball bearings. It simplifies mechanical structure, saves assembly space and reduces overall equipment weight. The curved raceway enables four-point contact between steel balls and raceways, delivering outstanding structural rigidity and stable rotary clearance to ensure high-precision rotational positioning.

Various sealing options are available to block dust and moisture intrusion, adapting to indoor automatic workshop conditions and outdoor construction machinery working environments. The integrated cage evenly separates steel balls to avoid collision and friction between rolling elements, lower operating noise and slow fatigue wear. Complete specifications follow international universal standards for easy replacement during renovation of automatic rotary equipment and construction machinery rotary components. The bearings are widely used in all kinds of medium and small precision rotary mechanisms.

Core Product Advantages

Single bearing bears bidirectional axial loads, radial loads and overturning moments, eliminating paired bearing assembly and simplifying mechanical structure;

Curved four-point contact raceway provides high contact rigidity and controllable rotary clearance for high-precision positioning and stable rotation;

Compact structure saves large axial installation space compared with paired angular contact ball bearings to realize lightweight equipment design;

Optimized integrated cage isolates steel balls steadily, reduces internal friction, lowers noise and improves durability;

Multiple sealing types are optional for dustproof and moisture resistance, suitable for indoor automatic production lines and outdoor construction machinery;

Simple assembly without complicated preload adjustment, shortening assembly time and improving production efficiency;

Standard universal dimensions with excellent interchangeability. No large modification of support frame is required during equipment upgrading.

Typical Application Scenarios

Joints of multi-axis industrial robots, rotary units of collaborative robots; CNC rotary tables, automatic indexing rotary mechanisms; rotary parts of small construction machinery, slewing supports of truck-mounted cranes; rotating structures of photovoltaic trackers, automatic turnover platforms; small rotary bases of radar, precision rotary modules for testing equipment.

Quality Assurance

NMT Four-Point Contact Ball Bearings implement precision-grade full-process quality control. Incoming bearing alloy steel is inspected for purity and hardness. Inner and outer rings go through precision turning, heat treatment strengthening and multi-stage superfinishing. Strict control is implemented on raceway curve precision and surface finish. Steel balls are sorted by dimensional tolerance. Precision processed cages prevent steel ball jamming. After assembly, finished products pass rotary torque testing, clearance inspection, composite load endurance test and sealing verification. All nonconforming products are eliminated. NMT continuously supplies precision rotary bearing solutions for manufacturers of automation equipment, construction machinery and intelligent robots.

Product Range

Open four-point contact ball bearings, single-sealed four-point contact ball bearings, double-sealed four-point contact ball bearings. Professional selection guidance is offered according to composite load, rotary speed, clearance requirements and service environment.

Brand Strength

NMT focuses on R&D and manufacturing of precision rotary bearings. Targeting lightweight composite load conditions of robot joints and rotary tables, NMT continuously optimizes raceway curve, heat treatment and sealing structure. The brand solves industry pain points including complicated assembly and excessive space occupation of traditional paired bearings, as well as incapability of ordinary bearings to withstand bidirectional axial loads. It helps medium and small rotary equipment simplify structural design, boost rotary precision and extend trouble-free operation time.