With the continuous upgrading of automatic equipment and construction machinery, a large number of rotating mechanisms bear forces from multiple directions instead of single-direction loads. Rotary platforms and equipment turntables are subjected to horizontal force, vertical force and overturning moment caused by tilting during operation. Ordinary bearings can only withstand loads in one single direction. Combined assembly of multiple bearings will not only enlarge the overall structure size of machinery, but also easily lead to uneven load distribution and rapid local abrasion of components. Many devices work in open-air conditions. Rotary mechanisms need long-term intermittent operation. Day and night temperature difference and dust erosion continuously test the comprehensive performance of bearings. Disassembly and assembly of mechanical rotating structures are complicated. Once the bearing fails, the whole set of equipment will stop running, bringing heavy loss of production and expensive maintenance cost. The market has strong demand for four-point contact ball bearings that can independently bear complex multi-directional loads, maintain long-term stable rotating precision and adapt to long-time intermittent working environments.

NMT Four-Point Contact Ball Bearings adopt optimized arc raceway design. Balls and raceways form four contact points. A single bearing unit can resist radial force, axial force and overturning moment at the same time, simplifying mechanical structure and reducing the number of assembled parts. Internal components are forged with high-purity bearing steel and processed through multiple precise heat treatment procedures to improve surface hardness and anti-fatigue performance, preventing spalling failure on rolling contact surfaces under long-term alternating loads. Precision screened and ground steel balls feature high dimensional consistency, reducing runout during rotation and maintaining positioning accuracy of rotary platforms for a long time. Different sealing structures can be selected according to working scenarios to block rainwater, dust, gravel and other contaminants from entering raceways and avoid deterioration of lubricating grease. Standard overall dimensions match mainstream installation standards of rotary mechanisms, making reconstruction and part replacement of new and old equipment simple and convenient. Long service life grease lubrication mode can be adopted to extend maintenance intervals, which is ideal for outdoor large machinery that cannot be maintained frequently.

Various structural types are available. Selection can be made according to rotating speed, compound load value and dustproof & waterproof requirements to fit intermittent low-speed rotation and continuous angle adjustment mechanisms.

Core Product Advantages

Four-point contact structure enables single bearing to carry radial loads, axial loads and overturning moments, simplifying overall transmission structure of equipment;

Optimized arc raceway realizes uniform load distribution, reduces contact surface stress and delays fatigue damage;

Precisely graded balls and finely ground raceways control rotating clearance and maintain stable rotary accuracy for long-term operation;

High-strength materials and integrated heat treatment resist alternating complex loads and adapt to variable outdoor temperature conditions;

Optional multiple sealing configurations deliver dustproof and moisture-proof performance and reduce abrasion failures caused by foreign particles;

Standard universal installation dimensions fit various rotating supports and construction machinery rotary devices for convenient replacement and assembly.

Typical Application Scenarios

Rotary mechanisms of light construction machinery; heavy-duty automatic rotary workbenches; rotary brackets for solar photovoltaic tracking systems; turntables of light lifting equipment; rotary positioning platforms for metallurgical workpieces; large turnover conveying mechanisms for warehousing industry.

Quality Assurance

NMT Four-Point Contact Ball Bearings are manufactured under full-process quality control complying with precision slewing bearing standards. High-purity alloy bearing steel and multi-stage precision grinding for raceways and balls are adopted. All finished bearings pass compound load endurance testing, rotating precision inspection and high-low temperature cycling testing to guarantee stable performance during long-term low-speed rotation. Complete specification system and reliable interchangeability support continuous supply for manufacturers of construction machinery, automatic equipment and new energy facilities.

Product Range

Open basic type and single-side dust sealed type available. Professional complete selection solutions based on rotating speed, compound load and environmental conditions are provided.

Brand Strength

NMT devotes itself to research and manufacturing of bearings for rotary mechanisms bearing complex loads. Solving common industry challenges including poor matching ability under multi-direction force, insufficient bearing fatigue life and easy contamination in outdoor environments, NMT continuously optimizes raceway curve design and material heat treatment technology, supplying high-precision, durable rotary support bearing solutions capable of sustaining complex loads for construction machinery, automatic rotary platforms and new energy tracking equipment industries.