Self-aligning ball bearings belong to double-row radial rolling bearings. The outer ring is equipped with spherical raceway while the inner ring has two arc raceways with steel balls as rolling elements. They deliver excellent self-aligning performance and effectively compensate coaxial deviation caused by assembly errors, frame deformation and shaft bending. The bearings mainly withstand radial loads and bear small bidirectional axial loads simultaneously. Featuring low operating noise and small friction resistance, they adapt to low and medium loads with stable continuous operation. They are widely used in textile machinery, light conveying equipment, small centrifugal fans, woodworking machinery, food processing equipment, printing machinery and other general light industrial equipment. During equipment assembly, machining tolerances and inconsistent installation easily trigger misalignment between bearing housing and rotating shaft. If deep groove ball bearings without self-aligning function are adopted, continuous eccentric load will unbalance force distribution on steel balls, resulting in increased noise, raceway abrasion and premature bearing failure in a short term. Benefiting from the unique spherical outer ring structure, self-aligning ball bearings allow the inner ring and rotating shaft to tilt within a certain angle and eliminate extra stress induced by eccentric load. Compared with spherical roller bearings, self-aligning ball bearings feature lighter weight, lower friction coefficient and higher limiting speed yet relatively lower load capacity, making them more suitable for light load, medium-high speed scenarios requiring low running noise. Different from deep groove ball bearings, they possess self-aligning property and lower requirements on assembly precision, greatly simplifying equipment assembly and commissioning. Light industrial production lines such as textile workshops suffer fluctuating humidity and long-term continuous operation with minor impact loads. Ordinary self-aligning ball bearings on the market often have defects including insufficient sorting precision of steel balls, rough raceway surface and unstable cages. Long-term operation easily causes persistent abnormal noise and accelerated aging of lubricating grease. NMT Self-Aligning Ball Bearings have complete product range including open type, double-sided rubber seal and double-sided metal seal versions with stamped steel cages. Sizes cover miniature specifications to small-medium universal dimensions. Standard clearance and C3 clearance options are available to fully satisfy demands of light industrial conveying, textile and ventilation equipment.

With continuous development of light manufacturing and material conveying industries, textile machines, belt conveyors and small fans need all-weather continuous operation. Many light-duty equipment have limited frame rigidity and tend to generate slight deformation during operation. Coupled with limited on-site assembly conditions, misalignment of varying degrees commonly exists. Dust and moisture in workshops easily invade bearings, contaminate lubricating grease and accelerate friction loss between steel balls and raceways. Equipment requires stable operation and imposes strict standards on bearing noise control and rotation smoothness. A large number of ordinary self-aligning ball bearings suffer high dimensional dispersion of steel balls. Uneven force emerges under tilted operation and operating noise rises continuously. Some sealing structures fail to resist moisture and dust penetration and shorten bearing service life. Machinery manufacturers are in urgent demand of premium self-aligning ball bearings with reliable self-aligning capacity, low friction, low noise, dependable sealing and outstanding cost performance. Optimized with revised curved profile of inner and outer raceways to improve contact stress distribution of steel balls under angular offset conditions, NMT Self-Aligning Ball Bearings adopt strict high-precision steel ball grading and screening procedures to guarantee balanced load sharing between double rows of steel balls. Upgraded superfinishing enhances raceway surface finish and reduces frictional noise during rotation, providing stable and reliable supporting solutions for various light industrial machinery prone to installation misalignment and light load conditions.

NMT Self-Aligning Ball Bearings consist of spherical outer ring, inner ring with double raceways, two rows of steel balls and stamped steel cages. The spherical outer raceway endows bearings with superior self-aligning capacity to compensate angular misalignment induced by shaft bending and assembly. The product series include open structure, 2RS double-sided rubber seal and 2Z double-sided metal seal. Open bearings facilitate on-site grease replenishment; rubber sealed versions achieve better dustproof and moisture-proof performance suitable for production workshops with complicated environment; metal sealed types adapt to dry and dust-free ventilation equipment. Steel balls undergo precise dimensional sorting. Combined with optimized curved raceways, bearings effectively avoid edge stress concentration and maintain stable rotation under tilted status. All steel balls complete precision grouping before assembly to strictly control dimensional errors and guarantee balanced and stable force on double rows of steel balls. The products are extensively matched on textile spinning machinery, belt conveyor rollers, small industrial fans, woodworking machine tools, food conveying devices, printing machinery and light-duty stirring transmission mechanisms.

Inner rings, outer rings and steel balls are manufactured from high-purity bearing chromium alloy steel. Multiple forging processes refine internal grain structure. Constant-temperature precise quenching and tempering ensure qualified hardness on working surfaces of raceways and steel balls while the matrix retains appropriate toughness to resist fatigue damage induced by continuous alternating light loads. Multiple superfinishing procedures are carried out on inner and outer raceways to reduce surface roughness and effectively suppress frictional noise during operation. All finished bearings pass dimensional inspection, steel ball grouping screening, radial clearance verification, long-time silent durability test and temperature rise monitoring test. Unqualified workpieces are eliminated to ensure consistent performance of mass products.

Standard clearance and C3 increased clearance specifications are optional with standard industry outer dimensions and favorable interchangeability for convenient maintenance and replacement of spare parts on various light industrial machinery.

Core Product Advantages

Spherical outer ring structure delivers reliable self-aligning ability to effectively compensate angular deviation caused by shaft bending, assembly misalignment and frame deformation;

Double-row steel ball structure achieves low rotation friction resistance, high limiting speed and low operating noise, suitable for medium-high speed stable continuous operation;

Capable of bearing radial loads and proper bidirectional axial loads, adapting to light-load combined stress scenarios such as textile and conveying machinery;

Multiple structures including open type, rubber seal and metal seal optional, fitting regular grease replenishment, dust & moisture prevention and dry dust-free environments respectively;

High-precision grouping and screening of steel balls strictly control dimensional deviation and realize balanced load distribution between double rows of steel balls to prevent local overload;

Standard clearance and C3 clearance available, adapting to normal temperature standard working conditions and medium-high temperature operation with thermal elongation of rotating shafts;

Premium bearing chromium steel combined with stable heat treatment achieves high surface finish, excellent wear and fatigue resistance and avoids abnormal noise after long-term operation;

Standardized universal outer dimensions with strong versatility for easy replacement and assembly of spare parts on textile machinery, conveyors and small fans.

Typical Application Scenarios

Various textile spinning machines, weaving machinery and printing & dyeing equipment; belt conveyors, roller conveying equipment and light-duty material transmission devices; small centrifugal fans, ventilators and cooling fan mechanisms; woodworking machine tools and light printing equipment; food packaging machinery and light stirring devices; small agricultural machinery and general light industrial transmission equipment.

Quality Assurance

Raw materials of NMT Self-Aligning Ball Bearings receive sampling inspection on hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner rings and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and superfinishing of raceways. All steel balls are graded and grouped according to dimensional precision to guarantee balanced load distribution on double rows of steel balls during rotation. Wear resistance and anti-aging tests are conducted on formed sealing parts and cages. All finished goods pass visual inspection, radial clearance screening, precision detection and long-time silent durability & temperature rise test. Sealed bearings dedicated for textile and food workshops receive additional simulation durability tests under moisture and dust conditions. Non-conforming products are separated independently. Every self-aligning ball bearing features flexible self-alignment, quiet and smooth rotation as well as reliable wear resistance, effectively lowering risks of unplanned shutdown failures of light industrial equipment.

Product Range

Open self-aligning ball bearings; 2RS double-sided rubber sealed self-aligning ball bearings; 2Z double-sided metal sealed self-aligning ball bearings; standard clearance and C3 clearance specifications; stamped steel cages; multiple miniature and small-medium sizes. Model selection depends on load magnitude, rotating speed, environmental dust & humidity and demand for regular oil replenishment.

Brand Strength

NMT focuses on R&D and manufacturing of self-aligning ball bearings. Targeting operating characteristics including light load & medium-high speed, frequent assembly misalignment and dust & moisture in workshops for textile machinery, light conveyors and small fans, NMT continuously optimizes curved raceway design, superfinishing technology and sealing structure. The bearings solve industry pain points such as excessive operating noise, seal leakage and uneven force on steel balls, help light equipment manufacturers improve overall operation stability and extend maintenance & replacement intervals of bearings.