Spherical roller bearings adopt double rows of spherical rollers, and the outer ring features spherical raceway, delivering excellent self-aligning capacity to effectively compensate misalignment caused by shaft deflection and assembly deviation. They can withstand heavy radial loads and bidirectional axial composite loads simultaneously. Benefiting from line contact rolling structure, strong load capacity and self-aligning characteristic, these bearings are widely used on heavy-duty mechanical equipment working under harsh conditions, prone to shaft deformation and concentricity error, including large industrial fans, cement rotary kilns, mining ball mills, crushers, paper drying cylinders, metallurgical rolling mills and large conveyors. Compared with cylindrical roller bearings, spherical roller bearings own exclusive self-aligning ability to adapt to axis offset during equipment operation. Different from spherical ball bearings, the roller structure greatly raises load limit with stronger impact and vibration resistance, suitable for heavy-load, medium-low speed and severe vibration industrial scenarios. Large-scale equipment in cement, mining and building material industries operate continuously under heavy dust, persistent vibration and fluctuating temperature. Rotating shafts are easily bent under heavy loads, and complete coaxiality can hardly be guaranteed during installation. Ordinary roller bearings will suffer abnormal wear and raceway spalling in a short time once axis misalignment occurs. Conventional spherical roller bearings on the market usually have defects including insufficient precision of spherical rollers, poor dimensional consistency of rollers and unreasonable internal lubrication channel design. Temperature tends to rise continuously under persistent vibration, leading to premature loss and failure of lubricating grease and shortened bearing service life. NMT Spherical Roller Bearings possess complete product lines with various inner diameter series. Stamped cages and solid brass cages are optional together with multiple clearance specifications. Sizes cover small-medium specifications and extra-large industrial dimensions, fully meeting supporting demands of heavy-duty large-scale equipment in building material, mining, metallurgy and energy industries.

With continuous upgrading of heavy industry, cement production lines, mining equipment and large ventilation units endure persistent heavy loads, alternating impact and intense vibration all year round. Shaft deflection and coaxiality deviation can hardly be eliminated completely during operation. The market sets higher standards on bearing self-aligning ability, load limit and wear resistance. Many large units feature long shaft systems prone to bending deformation. Bearings without self-aligning function lead to uneven force on rolling elements, severe heat generation and early fatigue damage. Meanwhile, dust and water vapor intruding into bearing cavities easily aggravate abrasion of rolling pairs, bringing severe challenges to bearing sealing performance and material toughness. A large number of ordinary spherical roller bearings adopt loose roller sorting standards and insufficient precision of spherical profile machining, resulting in large friction resistance during self-aligning operation. Insufficient structural strength of cages easily triggers deformation and wear under continuous vibration and causes sudden bearing failure. Equipment manufacturers and maintenance enterprises are in urgent demand of high-quality spherical roller bearings with strong load capacity, reliable self-aligning performance, high temperature and dust resistance as well as long-term stable operation. Optimized with revised spherical roller crowning design to improve contact stress distribution and reduce edge stress concentration, NMT Spherical Roller Bearings adopt strict high-precision roller screening and grouping procedures to guarantee highly unified dimensions of double-row rollers. Upgraded ultra-precision grinding of inner and outer raceways improves lubricant retention and reduces continuous operational friction loss, providing stable and reliable heavy-load self-aligning supporting solutions for all kinds of large heavy industrial equipment.

NMT Spherical Roller Bearings consist of inner ring, spherical outer ring, double-row symmetrical spherical rollers and cages. The spherical raceway of outer ring endows bearings with outstanding self-aligning performance to compensate angular misalignment induced by shaft deformation and assembly error. The double-row roller line contact structure enables simultaneous bearing of heavy radial loads and bidirectional axial loads. Multiple structural styles are available. Stamped steel cages are light in weight and suit conventional industrial working conditions; solid brass cages feature higher structural strength, superior vibration and high temperature resistance, adapting to harsh environments with intense impact such as mines and cement plants. Precisely sorted spherical rollers cooperate with ultra-fine ground spherical raceways to maintain stable operation even under axis offset and delay fatigue damage. All spherical rollers 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 large industrial induced draft fans, ball mills, cement rotary kilns, ore crushers, belt conveyors, paper drying cylinders, metallurgical continuous casting equipment, large hoisting devices and other heavy-duty equipment.

Inner rings, outer rings and spherical rollers 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 rollers while the matrix retains sufficient toughness to resist fatigue spalling and impact damage caused by long-term heavy loads and alternating vibration. Multiple ultra-precision grinding procedures are carried out on inner and outer spherical raceways to optimize surface texture, facilitate formation of lubricating oil film and cut frictional heat during operation. All finished bearings pass dimensional precision inspection, roller grouping screening, radial clearance verification, long-time heavy-load temperature rise durability test and vibration grade detection. Unqualified workpieces are eliminated to ensure consistent performance of mass products.

Various clearance grades and cage solutions are optional with standard universal outer dimensions and excellent interchangeability for convenient maintenance and replacement of spare parts on large industrial equipment.

Core Product Advantages

Double-row spherical rollers and outer spherical raceway deliver excellent self-aligning capacity, effectively compensating shaft deflection and assembly misalignment;

Line contact rolling structure provides extremely strong radial load capacity and bears bidirectional axial loads simultaneously for composite load working conditions;

Two cage options including stamped cage and solid brass cage adapt to conventional conditions and harsh scenarios with intense vibration and high temperature respectively;

Optimized spherical roller crowning relieves stress concentration and reduces local wear and pitting induced by biased load operation;

High-precision graded spherical rollers feature narrow dimensional dispersion to realize uniform load distribution on double rows and greatly extend fatigue service life;

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

Premium bearing alloy steel combined with mature heat treatment delivers great wear resistance, impact resistance and anti-fatigue performance to adapt to dusty environments with variable temperature;

Standard universal outer dimensions with strong versatility for easy replacement of spare parts on fans, ball mills and large cement & mining equipment.

Typical Application Scenarios

Cement plant rotary kilns, roller presses, raw material mills and cooling fans; mining ball mills, crushers and large belt conveying equipment; transmission positions of metallurgical continuous casters, auxiliary rolling mill equipment and sintering facilities; induced draft fans, blowers and exhaust fans in power plants and factories; supporting bearings of drying cylinders and pressing equipment in papermaking machinery; building material stone production lines and vertical mill equipment; large port machinery and hoisting lifting devices; large stirring equipment for sewage treatment.

Quality Assurance

Raw materials of NMT Spherical Roller 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 spherical rollers are graded and grouped according to high precision standards to guarantee balanced load distribution under biased load and vibration conditions. Impact durability and high-temperature wear resistance tests are conducted on formed cages. All finished goods pass visual inspection, clearance screening, geometric precision detection and long-time heavy-load vibration & temperature rise durability test. Special models dedicated for high-temperature and dusty mines and cement plants receive additional alternating biased load simulation tests. Non-conforming products are separated independently. Every spherical roller bearing features sensitive self-aligning performance, stable load capacity, vibration and wear resistance, greatly lowering risks of unplanned shutdown failures of large heavy industry equipment.

Product Range

Spherical roller bearings of multiple clearance grades; stamped steel cages and solid brass cages optional; multiple series of dimensional specifications covering small-medium to large heavy-duty bearing sizes. Model selection depends on load magnitude, vibration intensity, shaft deflection, environmental dust concentration and temperature.

Brand Strength

NMT focuses on R&D and manufacturing of spherical roller bearings. Targeting harsh working characteristics including heavy loads, severe vibration, easy shaft deflection and heavy dust for large cement, mining and metallurgical equipment, NMT continuously optimizes spherical roller crowning, spherical raceway grinding and cage structural design standards. The bearings solve industry pain points such as biased load stress concentration, vibration wear and grease failure under high temperature, help heavy industry enterprises improve operation stability of large units and extend equipment maintenance intervals.