Self-aligning ball bearings consist of double rows of steel balls, inner ring and spherical outer ring. The outer ring adopts spherical raceway structure with excellent self-aligning performance, which can effectively compensate shaft misalignment caused by assembly error and shaft bending deformation. The bearings operate in point contact rolling mode with low friction resistance and allow relatively high rotating speeds. They mainly bear radial loads and can withstand a small amount of bidirectional axial loads. Benefiting from self-aligning capability, smooth operation and low noise, they are widely used in ventilation fans, light belt conveyors, textile machinery, food processing equipment, woodworking machinery, water pumps and various small and medium-sized general light industrial equipment. Compared with spherical roller bearings, self-aligning ball bearings feature lighter weight, higher limiting speed and lower operating noise, while load capacity is relatively limited, making them more suitable for medium-light load and medium-high speed working conditions. Different from deep groove ball bearings, the unique spherical outer ring provides self-aligning characteristics to adapt to operating environments with poor assembly concentricity and slight deformation of rotating shafts. A large number of small and medium-sized mechanical equipment in textile, food and general light industries have long main shafts. It is difficult to achieve perfect coaxiality during frame processing and assembly. Shafts tend to produce slight deflection after long-term operation. Ordinary deep groove ball bearings cannot adapt to shaft offset, and continuous biased load operation will quickly cause abnormal noise, overheating and fatigue damage of rolling elements. Conventional self-aligning ball bearings on the market usually have defects including insufficient precision of steel balls, poor surface finish of raceways and unreasonable clearance design of cages. Obvious temperature rise and increasing noise occur during long-time high-speed operation, failing to meet continuous operation demands of light industrial equipment. NMT Self-Aligning Ball Bearings feature abundant specifications with open type and sealed type available. Stamped steel cages are optional together with multiple radial clearance grades. Sizes cover miniature and small-medium general specifications, fully meeting supporting requirements of light industrial machinery, ventilation equipment and small conveying devices.

With continuous improvement of automation level of general machinery, fans, textile machinery, food production lines and light conveying equipment need long-term non-stop continuous operation. Restricted by structural design, many small equipment feature long supporting distance of shaft systems and are prone to slight shaft deflection during operation. The market puts forward higher requirements on bearing self-aligning capacity, mute performance and continuous operation stability. Plenty of small general equipment owns narrow maintenance space, requiring bearings to maintain long durability and reduce frequent shutdown maintenance. Many ordinary self-aligning ball bearings adopt loose steel ball sorting standards with poor dimensional consistency of steel balls and large vibration at high speed. Insufficient grinding precision of inner and outer raceways makes it hard to maintain stable lubricating oil film, easily leading to heat generation and grease failure during long continuous operation. Machinery manufacturers are in urgent demand of high-quality self-aligning ball bearings with favorable self-aligning ability, low noise, controllable temperature rise and stable service life. Optimized with revised steel ball motion track and raceway curved surface design to improve contact stress distribution and reduce local stress concentration induced by biased load operation, NMT Self-Aligning Ball Bearings adopt strict high-precision steel ball screening and grouping procedures to guarantee highly unified dimensions of double-row steel balls. Upgraded ultra-precision grinding of inner and outer spherical raceways and optimized internal spatial structure improve lubrication conditions, providing economical and reliable self-aligning supporting solutions for small and medium-sized general mechanical equipment.

NMT Self-Aligning Ball Bearings are composed of inner ring, spherical outer ring, double-row steel balls and cages. The spherical raceway of outer ring endows bearings with self-aligning function to buffer angular offset caused by assembly deviation and shaft bending. The double-row steel ball point contact rolling structure primarily bears radial loads and undertakes moderate bidirectional axial loads. Open structure and double-sided rubber sealed structure are available. Sealed versions can prevent dust and moisture from entering the bearing interior. Stamped steel cages own compact and lightweight structure, adapting to high-speed continuous operation conditions of small and medium-sized equipment. Precisely sorted steel balls cooperate with ultra-fine ground spherical raceways to maintain stable and low-noise operation even with certain shaft offset and delay fatigue loss. All steel balls complete precision grouping and screening before assembly to strictly control dimensional tolerance and guarantee balanced force on two rows of rolling elements. The products are extensively matched on cooling fans, small belt conveyors, textile spinning equipment, woodworking machine tools, food stirring machinery, circulating water pumps, printing equipment and other small and medium-sized light industrial general equipment.

Inner rings, outer rings and steel rolling balls are manufactured from high-purity bearing chromium alloy steel. Repeated forging processes refine internal grain structure. Precise constant-temperature quenching and tempering guarantee qualified hardness on working surfaces of raceways and steel balls while the matrix retains reasonable toughness to resist fatigue pitting induced by continuous cyclic loads. Multiple ultra-precision grinding procedures are carried out on inner and outer spherical raceways to optimize surface micro-texture, facilitate formation of uniform and stable lubricating oil film and cut frictional heat during high-speed operation. All finished bearings pass dimensional precision inspection, steel ball grouping screening, radial clearance verification, long-time continuous operation temperature rise durability test and vibration & noise grade detection. Unqualified workpieces are eliminated to ensure consistent performance of mass products.

Various clearance grades and sealing schemes are optional with standard universal outer dimensions and excellent interchangeability for convenient maintenance and replacement of spare parts for general machinery.

Core Product Advantages

Double-row steel balls matched with outer spherical raceway deliver excellent self-aligning performance to compensate shaft deflection and assembly misalignment;

Point contact rolling structure brings low friction resistance, high limiting speed and low operating noise, suitable for medium-high speed and light load conditions;

Multiple structures including open type and double-sided sealed type are optional; sealed models effectively prevent dust and moisture and adapt to ordinary workshop environments;

Optimized curved surface design of raceways improves contact stress distribution and relieves local stress concentration and pitting under biased load conditions;

High-precision graded steel balls feature narrow dimensional dispersion to realize uniform load distribution on double rows and greatly extend bearing service life;

Ultra-precision grinding applied on spherical raceways achieves excellent surface finish, maintains stable lubricating oil film and controls temperature rise during long-term operation;

Premium bearing alloy steel combined with mature heat treatment delivers great anti-fatigue and wear resistance to adapt to long-time continuous production of light industrial equipment;

Standardized universal outer dimensions with strong versatility for convenient replacement of spare parts on fans, textile machinery, conveying equipment and other small and medium-sized machinery.

Typical Application Scenarios

All kinds of industrial cooling fans, exhaust fans and ventilation units; light belt conveyors and roller conveying equipment; textile spinning, weaving and chemical fiber processing machinery; woodworking cutting machines and grinding machine tools; food stirring and packaging processing equipment; circulating water pumps and small fluid pumps; printing machinery and auxiliary papermaking equipment; light agricultural conveying equipment and small feed machinery.

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 ultra-precision grinding of spherical raceways. All steel balls are graded and grouped according to high precision standards to guarantee balanced load distribution under shaft offset conditions. Impact durability and wear resistance tests are conducted on formed cages, and additional dust and water intrusion simulation tests are carried out for sealed models. All finished goods pass visual inspection, clearance screening, geometric precision detection and long-time continuous operation vibration, noise & temperature rise durability test. Sealed models used in dusty light industrial environments receive extra continuous dust invasion tests. Non-conforming products are separated independently. Every self-aligning ball bearing features flexible self-alignment, mute operation and stable temperature rise, greatly lowering frequent shutdown maintenance risks of small and medium-sized light industrial equipment.

Product Range

Self-aligning ball bearings of multiple clearance grades; open type and double-sided rubber sealed structure optional; multiple dimensional specifications covering miniature and small-medium general bearing sizes. Model selection depends on load magnitude, rotating speed, shaft offset, on-site dust and humidity conditions.

Brand Strength

NMT focuses on R&D and manufacturing of self-aligning ball bearings. Targeting working characteristics including medium-light load, continuous high speed and poor assembly concentricity for light industrial equipment such as fans, textile machinery and conveyors, NMT continuously optimizes raceway curved profile, steel ball precision standards and sealing structure design. The bearings solve industry pain points such as excessive noise at high speed, heat generation under biased load and abrasion caused by dust invasion, help light manufacturing enterprises improve continuous operation stability of equipment and extend replacement intervals of components.