The outstanding performance of every high-end equipment relies on the precision coordination of its internal core rotating components. Bearings, as the foundation for carrying loads, ensuring accuracy, and transmitting motion, directly determine the operating efficiency, machining quality, and service life of the equipment.

 

NMT Precision Four-Point Contact Ball Bearings are engineered specifically for demanding applications including industrial robots, cranes, radar turntables, and medical equipment. The unique Gothic arch raceway design enables a single bearing to simultaneously handle radial, bidirectional axial, and tilting moment loads – eliminating complex assemblies for a more compact structure and greater design freedom.

 

NMT bearings are manufactured from high-purity alloy steel through precision forging and gradient heat treatment, achieving uniform raceway surface hardness with a tough, resilient core. Ultra-precision grinding brings raceway roughness to below one micron, while steel balls undergo meticulous multi-stage grading for optimal fit, ensuring silky smooth rotation. Low friction, low vibration, and minimal temperature rise keep equipment performing steadily during prolonged continuous operation.

 

For different operating environments, NMT offers both open and sealed configurations. Sealed bearings feature multi-layer protection against dust, moisture, and corrosive media, maintaining internal lubrication cleanliness and significantly extending service intervals. All products adhere to internationally standardised external dimensions for seamless interchangeability with leading imported bearings, making replacement and upgrades straightforward and efficient.

 

Every NMT bearing undergoes rigorous dynamic performance verification before shipment, ensuring consistent and reliable quality. A comprehensive product range covers everything from lightweight thin-section types to heavy-duty reinforced models, with bore diameters from 16mm to over 650mm. Choosing NMT means equipping your machinery with a precision heart that stands the test of time.

 

Core Product Advantages

Single bearing handles three-direction combined loads, simplifying equipment structure, saving installation space, and increasing design flexibility;

 

High-purity alloy steel combined with precision heat treatment delivers high raceway hardness and a tough core for wear resistance and fatigue strength;

 

Superfinished raceways paired with precision-graded balls achieve low friction resistance, smooth operation, and reduced energy consumption;

 

Excellent thermal stability ensures controllable temperature rise during long continuous runs, maintaining accuracy over extended periods;

 

Sealed variants with multi-layer protection resist dust, moisture, and corrosion, performing reliably in harsh environments;

 

Internationally standardised external dimensions allow direct interchangeability with major brands without modifying surrounding structures;

 

100% dynamic performance inspection prior to shipment, with full traceability for every bearing set;

 

Extensive product line covering bore diameters from 16mm to over 650mm, available in thin-section and heavy-duty series to suit diverse equipment needs.

 

Typical Applications

Industrial robot joints – precise positioning under high-frequency reciprocating motion; Crane slewing systems – smooth rotation under heavy torque loads; Radar antennas and launchers – durable operation in all-weather outdoor conditions; CT scanners and linear accelerator rotary platforms – low-noise, low-vibration support for high-definition imaging; CNC rotary tables and indexing plates – high-rigidity support and accurate indexing; Port and marine crane equipment – long-term reliable service in salt-spray environments; Construction machinery and aerospace ground equipment – stable load-bearing under extreme conditions.

 

Quality Assurance

NMT’s commitment to quality is embedded in every process. From incoming inspection of high-purity bearing steel – including spectral analysis, inclusion rating, and grain size evaluation – we ensure material purity and uniformity. Precision-controlled forging refines the grain structure, providing an excellent metallurgical foundation for subsequent processing.

 

Raceway manufacturing involves three stages: rough grinding, fine grinding, and ultra-precision finishing, consistently achieving surface roughness Ra ≤ 0.04μm for smooth contact surfaces and uniform stress distribution. Steel balls undergo multi-stage grinding and high-accuracy grading, with within-set diameter differences controlled to micron levels. Cages are precision-formed with accurate pocket dimensions for smooth, obstruction-free guidance.

 

Assembly takes place in dedicated clean workshops, with all components high-pressure cleaned and dried to eliminate contamination. Finished products undergo torque testing, vibration measurement, clearance re-inspection, and dynamic run-in tests – all data recorded for individual traceability. Packaging uses rust-preventive vacuum sealing and heavy-duty outer cartons to ensure every bearing arrives in pristine condition.

 

Product Range

Thin-section series: lightweight and compact, ideal for robot joints, medical rotary platforms, and other space-constrained applications;

 

Heavy-duty series: reinforced cross-section, suitable for cranes, port machinery, construction equipment, and other high-load scenarios;

 

Bore diameter: 16mm to 650mm (custom non-standard sizes available);

 

Speed range: 1500 to 17000 r/min;

 

Configurations: open, single-seal, double-seal;

 

Precision grades: P0, P6, P5, P4;

 

Clearance grades: C2, CN, C3, and custom clearances.

 

Brand Strength

NMT has been dedicated to precision bearing manufacturing for over a decade, with a continuous focus on technology advancement and quality improvement in four-point contact ball bearings. Our products are widely used in high-end equipment manufacturing both domestically and internationally, earning long-term trust from customers across various industries thanks to consistent performance and reliable quality.

 

NMT operates modern production and inspection systems, with key processes ensured by CNC equipment for precision consistency. Our testing laboratories are equipped with roundness testers, roughness testers, vibration benches, torque detectors, and other specialised instruments to guarantee batch-to-batch quality stability. We are committed to practical innovation and continuous refinement of product details, striving to deliver high-performance, long-lasting bearings to customers worldwide.

 

At NMT, we view bearings not just as components, but as the very foundation for long-term efficient equipment operation. We value every trust placed in us and respond with solid, dependable product quality.