1 Structural Composition and Working Principle of NMT Ball Screw Bearings

Ball screw bearings mainly consist of inner rings, outer rings, steel balls, cages, seals and preload structures. Their raceways adopt angular contact design, which can form stable contact angles and simultaneously carry axial loads, radial loads and overturning moments.

Japan NMT ball screw bearings are specially designed for screw support conditions. Common types include angular contact ball bearings, double-direction thrust angular contact ball bearings and combination bearings. Compared with ordinary deep groove ball bearings, screw support bearings emphasize axial rigidity, positioning accuracy, preload stability and high-speed feed performance. Their core function is to provide stable rotary support for ball screw assemblies, reducing axial play, thermal deformation and transmission errors. Ball screw bearings are widely used in CNC machine tools, machining centers, precision machine tools, automation equipment and precision feed systems. They are key components determining machine tool positioning accuracy, rigidity and machining stability.

2 Core Performance Advantages of Japan NMT Ball Screw Bearings

First, angular contact structure can simultaneously carry axial loads, radial loads and overturning moments.

Second, high-rigidity design, suitable for feed systems of CNC machine tools, machining centers and precision machine tools.

Third, stable high precision grade, suitable for precision positioning and high-speed cutting conditions.

Fourth, optional preload structure allows adjusting axial clearance and contact state according to rigidity requirements.

Fifth, low-friction rolling structure reduces starting resistance, temperature rise and feed energy consumption.

Sixth, internationally standard mounting dimensions ensure good interchangeability for direct replacement of imported screw bearings.

3 Main Industrial Application Scenarios of NMT Ball Screw Bearings

3.1 CNC Machine Tools

Screw support parts for CNC lathes, machining centers, milling machines, grinding machines and CNC equipment.

3.2 Precision Machine Tools

Bearing parts for jig boring machines, precision grinding machines, CNC grinding machines and high-precision machining equipment.

3.3 Automation Equipment

Screw supports for linear slides, robots, gantry equipment and automated production lines.

3.4 Semiconductor Equipment

Feed systems for wafer processing equipment, inspection equipment, precision positioning mechanisms and semiconductor manufacturing equipment.

3.5 Light Industrial Precision Equipment

Screw supports for printing machines, packaging machines, inspection instruments and precision test platforms.

3.6 General Transmission Systems

Axial support parts for precision tables, lifting mechanisms, test benches and industrial equipment.

4 Model Selection, Assembly and Daily Operation & Maintenance Guidelines

4.1 Key Points for Structure Selection

Load direction: select angular contact ball bearings when axial loads are dominant; select double-direction thrust structures when bidirectional axial support is required;

precision grade: high precision grade preferred for CNC machine tools and precision machine tools;

preload grade: heavy preload for heavy-load high-rigidity scenarios; light preload or medium preload for high-speed low-heat scenarios;

contact angle: large contact angle for large axial loads; suitable contact angle for combined loads and high-speed feed;

installation method: confirm shaft diameter, housing bore, mounting height, preload method and locking structure.

4.2 Assembly Specifications

Before installation, check that bearings, shafts, bearing housings, lock nuts and mating surfaces are clean, free of burrs, chips and oil contamination.

Ensure coaxiality and axial positioning during screw bearing installation to avoid contact angle change and rigidity loss caused by uneven loading.

Tighten preload nuts according to specified torque and sequence to prevent excessive preload causing temperature rise and accelerated wear.

Pay attention to orientation and combination method when installing paired bearings to avoid reverse installation causing insufficient axial rigidity.

Keep assembly environment clean; dust, chips and contaminants entering the bearing cause raceway damage, noise and accuracy loss.

4.3 Lubrication Suggestions

High-speed bearing grease or spindle oil is recommended for ball screw bearings to adapt to high-speed precision feed conditions.

Regularly check grease or oil condition and replace when blackened, contaminated, emulsified or with abnormal temperature rise.

Control grease filling quantity for high-speed feed equipment to avoid temperature rise and increased resistance caused by overfilling.

Continuously running equipment can adopt oil-air lubrication, oil mist lubrication or automatic lubrication systems.

Do not mix different types of lubricating materials to avoid lubricating film failure.

4.4 Daily Inspection Focus

Monitor positioning accuracy, axial play, temperature rise, noise and preload condition continuously.

Periodic abnormal noise or vibration usually originates from raceway damage, steel ball defects, insufficient lubrication, improper preload or contaminant ingress.

Monitor temperature changes in high-speed feed equipment; continuous high temperature may indicate insufficient lubrication, excessive preload or bearing damage.

Regularly check lock nuts, seals and lubrication lines; replace promptly when loose, leaking or blocked.

Inspect or replace the bearing promptly when abnormal axial play, raceway spalling or poor rotation is observed.

5 Import Substitution Value and Supply Chain Advantages of NMT Ball Screw Bearings

Manufacturers of CNC machine tools, precision machine tools, semiconductors and automation equipment often face long lead times for high-precision screw bearings, high prices, complex pairing and long replacement cycles when sourcing imported screw bearings. Japan NMT ball screw bearings are made of high-purity bearing steel with precision angular contact raceway machining technology. Their rigidity, positioning accuracy, preload stability and high-speed feed performance match imported products, suitable for OEM precision assembly and equipment maintenance replacement.

All products comply with international standard mounting dimension specifications; most sizes can be directly replaced without modifying shaft diameters, housing bores and locking structures. Popular screw bearing sizes are stocked to quickly fulfill precision equipment bulk orders and urgent maintenance demands. Streamlined supply chains reduce intermediate costs and control long-term component procurement expenditure for sectors such as CNC machine tools and precision machine tools.

Ball screw bearings combine high rigidity, high precision, low friction and stable feed performance, ensuring stable operation of feed systems such as CNC machine tools, machining centers and precision machine tools. They reduce axial play, thermal deformation and accuracy drift, optimize the precision machine tool transmission supply chain and ease production risks caused by unstable delivery cycles of imported screw bearings.