Industrial robot joints, CNC rotary tables, automatic indexing plates and optical testing equipment need to bear radial loads, axial loads and overturning moments simultaneously during operation, with strict requirements for rotary positioning accuracy and operating rigidity. Traditional bearing combination schemes require multiple sets of bearings for assembly, leading to complicated structures and occupying massive installation space. Ordinary slewing bearings feature low clearance control precision, prone to shaking during rotation and insufficient repeated positioning accuracy, and cannot meet the demand of continuous high-precision operation of precision automation equipment. The precision intelligent equipment manufacturing industry urgently needs crossed roller bearings with compact size, high rigidity and ultra-high positioning accuracy.

Many intelligent automated production lines pursue miniaturized integrated equipment design. The reserved assembly space inside robot joints and precision rotary tables is extremely limited. Meanwhile, the equipment frequently starts, stops and rotates reciprocally, generating alternating composite loads continuously. Once bearings lack sufficient rigidity and produce tiny deformation during rotation, positioning deviation will occur directly, impairing machining precision and detection accuracy. Excessive clearance will trigger vibration and noise and accelerate fatigue wear of components. Conventional bearing combination schemes on the market have bulky structures, and ordinary rotary bearings fail to balance narrow installation space and long-term stable high-precision operation. High-end precision automation equipment urgently requires high-performance precision crossed roller bearings.

NMT Precision Crossed Roller Bearings adopt a design where rollers are arranged perpendicularly in a crossed manner. A single bearing can bear radial loads, axial loads and overturning moments simultaneously, greatly simplifying the overall assembly structure. Rollers contact raceways in line contact mode, delivering outstanding structural rigidity and strong resistance to external force deformation. Raceways are processed via ultra-precision grinding, enabling minimal clearance or preload configuration to effectively suppress rotary shaking and guarantee angular positioning accuracy. Featuring compact outer diameter and thin thickness, the bearings greatly save internal installation space of equipment and adapt to integrated design of various lightweight precision equipment. They are suitable for low-speed indexing and intermittent reciprocating rotation conditions and sustain stable operating precision for a long time. Dimensions comply with general industrial standards for convenient upgrading and replacement of new and old precision equipment.

Inner rings, outer rings and rollers are made of high-purity bearing alloy steel. Precision forging optimizes internal metallographic structure and improves fatigue resistance of contact surfaces. All components receive complete quenching heat treatment and long-term stabilization treatment to reduce dimensional fluctuation caused by temperature change. Cylindrical rollers are grouped and screened at micron precision to guarantee consistent roller size, evenly distribute loads and avoid premature wear induced by local stress concentration. The precision split cage limits rollers accurately to prevent mutual friction and collision and sustain smooth rotation.

The bearings cover complete specifications with excellent interchangeability. Widely applied in multi-axis industrial robot joints, CNC machining center rotary tables, automatic indexing mechanisms, optical testing instruments, laser processing rotary platforms and semiconductor automation equipment, meeting demands of composite load support and high-precision rotation for all types of precision equipment.

Core Product Advantages

Crossed roller layout enables a single bearing to bear composite loads including radial loads, axial loads and overturning moments and simplify equipment structural design;

Line contact between rollers and raceways delivers excellent rigidity and tiny deformation under force to guarantee positioning stability of equipment;

Ultra-precision ground raceways support minimal clearance and preload options, realizing low rotary shake and high repeated positioning accuracy;

Thin and compact shape occupies less installation space, adapting to the miniaturization and integration trend of automation equipment;

Stabilized heat treatment prevents dimensional distortion under temperature variation and maintains high-precision operation long-term;

High-precision sorted rollers realize uniform load distribution, reduce partial wear and extend bearing service life;

Precision separated cage lowers roller friction noise and achieves smooth rotation with low vibration;

Standardized outline specifications fit mounting bases of most precision rotary tables and robot joints for convenient renovation and replacement.

Typical Application Scenarios

Rotary parts of 4-axis and 6-axis industrial robot joints; precision rotary tables of CNC machining centers and grinders; automatic production line indexing plates and rotary tool fixtures; rotary units of optical image inspection and visual alignment equipment; rotary processing platforms for laser cutting and laser welding; automatic rotary mechanisms for semiconductor packaging; precision rotary supports of small radars and monitoring pan-tilts.

Quality Assurance

NMT Precision Crossed Roller Bearings are produced with premium bearing alloy steel raw materials. Incoming material composition inspection and metallographic sampling tests are conducted to strictly control raw material purity. Inner and outer ring blanks are formed by combined precision cold forging and hot forging to optimize internal metal flow structure. Stress relief treatment is implemented after rough machining to eliminate internal stress generated during processing and reduce dimensional drift under long-term alternating loads. Multi-stage grinding and ultra-finishing are carried out on raceway working surfaces with strict control over surface roughness and geometric tolerance indicators.

All cylindrical rollers pass dimensional classification screening and flaw detection to remove workpieces with tiny collision cracks and defects. Components go through high-pressure cleaning and dust-free drying before assembly in constant-temperature clean workshops. Clearance schemes are matched according to equipment precision requirements. Finished products complete rotary precision inspection, rigid load testing and alternating load durability tests. All unqualified products are rejected thoroughly to guarantee unified precision of bulk goods and provide stable and reliable rotary support solutions for precision intelligent equipment.

Product Range

Standard crossed roller bearings, preloaded high-precision crossed roller bearings, ultra-thin compact crossed roller bearings. Selection depends on load capacity, precision grade and installation space.

Brand Strength

NMT specializes in R&D and manufacturing of precision rotary bearings. Targeting industry pain points of industrial robots and CNC rotary tables such as composite load bearing demand, limited assembly space and high-precision positioning requirements, NMT continuously optimizes ultra-precision raceway grinding technology, roller sorting technology and cage structural design. The bearings effectively solve common problems including complicated assembly of multi-bearing combinations, insufficient rigidity and positioning shake of ordinary rotary bearings. NMT products support long-term stable high-precision operation of automation precision equipment and reduce equipment commissioning and maintenance costs.