Spindles of precision grinding machines, CNC boring and milling machines and precision rotary tooling bear alternating axial loads in both directions during high-speed operation, requiring strict control over axial clearance and positioning accuracy. Ordinary single-direction thrust ball bearings can only withstand axial force from one side and cannot realize bidirectional limitation. The scheme adopting two opposite-mounted single-direction thrust bearings struggles to control preload accurately, easily causes eccentric load, brings complicated assembly and debugging, and leads to excessive vibration and precision degradation after long-term high-speed operation. High-end precision processing equipment requires spindles to maintain stable axial rigidity, and axial play must be kept within an extremely small range. Insufficient bearing rigidity and out-of-control clearance directly cause dimensional errors and poor surface quality of machined workpieces. Equipment designers need integrated thrust bearings capable of bearing bidirectional axial loads with stable preload and high rotary accuracy, to simplify spindle support structures, reduce assembly difficulty and guarantee consistent machining precision of precision machine tools.

NMT Double Direction Angular Contact Thrust Ball Bearings adopt integrated structural design. A single bearing can bear forward and reverse axial loads simultaneously and realize accurate bidirectional axial limitation for spindles. Opposite assembly of two single-direction bearings is no longer required, greatly simplifying spindle support structures. Ultra-precision sorted rolling elements and super-finished raceways deliver high geometric accuracy, maintain tiny axial play and outstanding axial rigidity to suppress axial vibration of high-speed spindles effectively. Built-in preload structure ensures controllable factory precision and avoids eccentric load caused by unbalanced on-site preloading, suitable for long-term continuous high-speed operation of machine tool spindles. Low-friction high-precision cages guide balls to roll smoothly, reduce temperature rise and slow down fatigue wear on contact surfaces. Complete specifications match mounting dimensions of various precision machine tool spindles, supporting new equipment assembly and renovation of old precision spindles. Widely adopted in high-speed precision rotary units requiring bidirectional axial restraint.

The product portfolio includes standard double direction angular contact thrust ball bearings and low-temperature-rise high-speed versions. Widely applied in surface grinders, internal grinders, CNC boring machine spindles, precision indexing spindles, rotary supports for optical equipment and spindles of automatic precision grinding tooling. Standard machine tool dimensions ensure excellent interchangeability.

Core Product Advantages

Integrated bidirectional load-bearing design enables one bearing to withstand axial loads from two directions, eliminating paired single bearing assembly and simplifying spindle structures;

Super-finished raceways and graded steel balls provide high axial rigidity, control spindle axial play and stabilize machining dimensional accuracy;

Controllable preload at factory reduces on-site debugging steps, prevents eccentric load caused by assembly deviation and lowers spindle vibration risks;

Optimized high-precision cages deliver smooth rolling guidance, low friction and less heat generation, meeting long-term high-speed operation demands of precision spindles;

Complete size series with high standardization fit new and old precision machine tool spindles for convenient component replacement;

Sustained stable operating accuracy with slow precision attenuation during long service life and less regular calibration for machine tools.

Typical Application Scenarios

High-precision spindles of internal grinders and surface grinders; spindle units of CNC boring & milling machines and jig grinders; precision CNC indexing rotary spindles; rotary support mechanisms for optical inspection equipment; spindles of automatic precision grinding and polishing machinery; rotary supporting parts of precision testing instruments.

Quality Assurance

NMT Double Direction Angular Contact Thrust Ball Bearings implement full-process closed-loop quality control. High-purity bearing steel for precision bearings is inspected batch by batch. Multiple inspection nodes cover graded ball screening, ring heat treatment, raceway super-finishing and assembly preload adjustment. Finished products pass rotary precision inspection, high-speed temperature rise tests, axial rigidity tests and durability simulation tests. Products with insufficient precision, abnormal temperature rise or poor rigidity are strictly rejected. Reliable high-precision bidirectional axial support solutions are steadily supplied to manufacturers of precision machine tools and high-end automation equipment.

Product Range

Standard double direction angular contact thrust ball bearings, high-speed low-temperature-rise double direction angular contact thrust ball bearings. Professional selection guidance is offered based on axial load, rotating speed, accuracy grade and installation space.

Brand Strength

NMT focuses on R&D and manufacturing of precision spindle bearings. Targeting core demands of spindles for precision grinders and CNC equipment including bidirectional alternating axial loads, low vibration at high speed and long-term precision retention, NMT continuously optimizes raceway super-finishing technology, rolling element screening standards and preload assembly processes to improve axial rigidity, rotary accuracy and high-speed stability. Machine tool manufacturers are supported to simplify spindle module structures, shorten assembly and debugging cycles, ensure consistent production of high-quality workpieces by precision processing equipment and cut later maintenance and calibration costs.