NMT Ltd.
Corporate Communications Department
NMT Four-Point Contact Ball Bearings Slewing Support Bearings For Construction Machinery, Precision Ball Bearings Capable of Bearing Bidirectional Axial Loads
Many rotary industrial equipment simultaneously bears radial force, forward and reverse axial thrust as well as tilting overturning moment during operation. Ordinary paired angular contact bearings require complicated assembly and occupy plenty of internal space. They set strict standards for machining and assembly tolerances. Assembly deviation easily leads to rotation stagnation and premature wear. A large number of construction machinery and automatic rotary platforms have compact layout, requiring a single bearing to carry multi-directional loads and simplify transmission structure. With special arc raceway design, four-point contact ball bearings can bear multi-directional composite loads with only one set of balls, making them ideal supporting parts for various rotary mechanisms.
Optimized for composite load conditions of rotary equipment, Japan NMT develops the four-point contact ball bearing series. Integral inner and outer rings cooperate with high-precision graded steel balls. Five core technologies are adopted: high-purity bearing steel, optimized arc raceway profile, ultra-precision grinding, stabilized quenching heat treatment and low-friction cages. The four-point contact structure bears multi-directional composite loads and eliminates complicated assembly work needed for two paired bearings. It improves internal space utilization and reduces overall equipment volume. High-precision raceways bring low rotation resistance and smooth low-speed rotation without jamming. The products are widely matched with small construction machinery rotary assemblies, crane rotary platforms, automatic tooling rotary tables, solar tracking brackets, material turnover equipment and robot rotary joints.
Core Product Advantages
Single bearing for composite loads: One bearing supports radial loads, bidirectional axial loads and overturning moments simultaneously, simplifying transmission structure and lowering assembly difficulty.
Compact structure for space saving: Narrower overall width compared with paired angular contact ball bearings, shrinking the size of rotary mechanisms and fitting compact equipment design.
Flexible rotation with outstanding precision: Precisely ground raceways reduce rolling resistance for smooth low-speed rotation and small positioning error to guarantee equipment accuracy.
Balanced stress and anti-overturn performance: Uniform load distribution via four-point contact structure resists continuous tilting moment and improves operational stability.
Easy maintenance and wide compatibility: Standardized structure enables convenient lubrication and maintenance, suitable for various automatic equipment and small engineering rotary devices.
Application Scenarios
Rotary mechanisms of small construction machinery; turntable support for cranes; rotary tooling platforms on automatic production lines; rotary brackets for photovoltaic tracking systems; material turnover and rotary conveying equipment; rotary joints of automated robots; large rotary actuators for valves.
Precision Quality Assurance
NMT four-point contact ball bearings are produced according to strict manufacturing standards for precision rotary bearings. Raw materials are inspected for impurities. Inner and outer ring raceways receive ultra-precision grinding to accurately control contact radian. All finished products pass rotary torque inspection, composite load durability test and rotation precision calibration. The bearings sustain multi-directional composite loads steadily in long-term operation and avoid premature component wear.
Product Range
Basic series of four-point contact ball bearings; open structure; complete standard specifications; customized non-standard dimensions for automatic equipment and construction machinery are available.
Brand Strength
Japan NMT devotes to research and precision manufacturing of rotary bearings, mastering core technologies including raceway profile optimization, low-friction processing and composite load condition adaptation. Products are continuously upgraded to solve industry challenges of rotary equipment such as multi-directional loads, limited installation space and high precision requirements. It overcomes drawbacks of traditional paired bearings including complicated structure, large space occupation and difficult assembly, supplying stable and durable rotary bearing solutions for automation and construction machinery manufacturers worldwide.