The internal rotary space of industrial automation and robot equipment is limited. Traditional matched angular contact bearings require two sets to bear bidirectional axial force, occupying extra installation space and complicating assembly procedures. Rotary mechanisms endure continuous overturning moments during operation. Ordinary bearing assemblies suffer uneven load distribution, leading to precision degradation after long-term operation and positioning deviation of equipment. Many indexing turntables run with intermittent reciprocating rotation and frequent start-stop impact loads, setting strict standards for bearing rigidity and precision retention capacity.

Dust and moisture exist in some production sites. Open bearings are prone to rust and grease contamination failure. Frequent maintenance interrupts production cycles. Equipment manufacturers pursue integrated component design, expecting single bearing parts to bear multi-directional combined loads so as to reduce component quantity and cut assembly costs. The market demands four-point contact ball bearings featuring narrow axial size, capacity to withstand bidirectional axial force and overturning moment, and long-lasting stable precision.

NMT Four-Point Contact Ball Bearings adopt high-purity bearing steel processed by stabilized precise heat treatment. Inner and outer ring raceways own uniform hardness and outstanding contact fatigue resistance. Micron-level ultra-precision grinding is applied on Gothic arch raceways to realize uniform four-point contact of balls, balanced load distribution, restrained rotational clearance and long-term stable rotary positioning precision. Balls are strictly graded by dimension to reduce operational vibration and guarantee smooth low-speed rotation.

Multiple sealing options are available. Seals closely fit bearing end faces to prevent dust, moisture and impurities from entering raceways and slow down rust and abrasion. Complete specification system and universal standard dimensions enable equipment upgrading without large modification on tooling bases. The simplified structure requires no paired installation, effectively saving axial space and meeting lightweight compact design demands.

Core Product Advantages

Unique four-point contact structure enables single bearing to bear bidirectional axial loads, radial loads and overturning moments;

Compact axial width greatly saves installation space compared with matched bearing solutions and simplifies overall machine structure;

Ultra-precision ground Gothic arch raceways deliver balanced stress distribution, excellent precision retention and minor positioning error;

Graded balls reduce vibration, ideal for low-speed precision rotation of robot turntables and indexing devices;

Optional dustproof seals resist erosion from dusty and humid environments and extend lubrication intervals;

Abundant standard specifications with good interchangeability support convenient replacement for automated rotary equipment.

Typical Application Scenarios

Waist and wrist rotary joints of 6-axis industrial robots; indexing turntables and rotary switching mechanisms of automated production lines; rotary platforms of precision testing equipment; slewing supports of small construction machinery; rotary station devices of packaging machinery; swing indexing mechanisms of CNC equipment.

Quality Assurance

NMT Four-Point Contact Ball Bearings implement standardized full-process quality control. Raw materials receive flaw detection and composition inspection. Inner and outer ring raceways are precisely processed step by step. All balls are sorted by dimension. Finished products pass rotary precision testing, torque durability tests and alternating load simulation inspection. Non-compliant products with rapid precision loss and abnormal friction torque are strictly rejected. High-quality bearing solutions are steadily supplied to automation equipment manufacturers.

Product Range

Open type without seal, single-sided sealed type, double-sided sealed type; standard clearance type and small clearance precision grade. Professional selection suggestions are offered based on rotary speed, load magnitude, humidity and dust level of working environments.

Brand Strength

NMT specializes in R&D and manufacturing of precision rotary bearings. Targeting industry pain points of industrial robots and precision turntables including limited installation space, multi-directional combined loads, easy precision decline after long service and dusty humid working conditions, NMT continuously optimizes raceway grinding technology, ball selection standards and sealing structures. High-performance four-point contact ball bearings are developed to help automation equipment reduce overall size, improve positioning stability and lower maintenance frequency.