Spherical roller bearings consist of outer rings with spherical raceways, inner rings, symmetrical barrel-shaped rollers and cages. They feature excellent self-aligning performance and can effectively compensate coaxial deviation, installation misalignment and angular deflection caused by shaft deflection between shafts and bearing housings. The bearings can withstand heavy radial loads and bidirectional axial loads simultaneously with high load capacity and outstanding impact resistance. They serve as core supporting components for equipment operating under harsh conditions, including mining machinery, cement production lines, large fans and vibratory equipment. The products are widely applied in ball mills, vertical mills, rotary kilns, large centrifugal fans, ore conveyors, vibrating screens, paper dryers, heavy-duty reducers and other industrial machinery enduring heavy loads, continuous vibration and shaft deflection.

Compared with cylindrical roller bearings, spherical roller bearings adopt spherical outer raceways with self-aligning capability. They operate smoothly without seizure or abnormal wear even when shafts bend or installation deviation exists. Different from tapered roller bearings, they can bear bidirectional axial loads and have higher tolerance for installation misalignment, making them ideal for heavy machinery equipped with long transmission shafts, flexible rotating shafts and continuous vibration. Equipment in mining, cement and building material industries runs year-round under harsh environments featuring heavy dust, frequent impact loads and persistent vibration. Rotating shafts tend to deflect under heavy loads. Bearings lacking self-aligning capacity will suffer uneven roller load distribution, leading to local pitting, overheating and seizure within a short period and resulting in production line shutdown. Ordinary spherical roller bearings on the market often have defects such as insufficient roller profile precision, uncontrolled internal stress and poor surface finish of raceways. Early fatigue failure easily occurs under continuous vibration and alternating impact, significantly increasing equipment maintenance costs for enterprises.

NMT Spherical Roller Bearings own a complete product range covering standard CC type, CA type and reinforced structures. Stamped steel cages and brass solid cages are optional. Two bore types including cylindrical bore and tapered bore are available to match adapter sleeves and withdrawal sleeves. Dimensions range from small and medium specifications to large heavy-duty bearings, fully meeting supporting demands of mining machinery, cement equipment, large fans and metallurgical machinery.

With continuous development of cement, mining and heavy industries, large crushing equipment, high-power fans and continuous calcination facilities keep growing in size. Longer shafts are prone to deflection under heavy operating loads. Machines work in dusty environments with persistent vibration, requiring bearings to combine high load capacity, impact resistance, self-aligning performance and long-term durability to reduce downtime. Conventional spherical roller bearings lack sufficient optimization on barrel roller curved surfaces. Stress concentration emerges easily under misalignment conditions, and temperature rises rapidly with inadequate lubrication, failing to satisfy long-term continuous production requirements. Heavy industry manufacturers are in urgent need of durable heavy-duty spherical roller bearing solutions with reliable self-aligning capability.

NMT Spherical Roller Bearings adopt optimized spherical profiles for barrel rollers to improve contact status between rollers and raceways and evenly distribute contact stress under angular deflection. A high-precision roller sorting system strictly controls dimensional tolerance of each roller group. Multiple ultra-precision grinding procedures are carried out on inner and outer raceways to improve surface finish. Heat treatment processes are continuously optimized to balance hardness and toughness of steel. The guide structure of cages and lubrication passages are improved to enhance penetration of lubricant and restrain frictional temperature rise under continuous vibration, delivering stable and reliable supporting guarantee for heavy-duty equipment with flexible shafts.

NMT Spherical Roller Bearings are composed of outer rings, inner rings, barrel-shaped rollers and cages. Outer rings feature spherical inner raceways with self-aligning function, allowing limited angular misalignment between shafts and housings. Double-row symmetrical barrel-shaped rollers can bear radial loads and bidirectional axial loads at the same time. CA versions equipped with brass solid cages have high rigidity for heavy-load and heavy-impact applications. CC versions adopt stamped steel cages with low rotational resistance and wide versatility. Bearings with cylindrical bore can be mounted directly on shafts; tapered bore bearings cooperate with adapter sleeves and withdrawal sleeves for convenient field assembly and clearance adjustment. High-precision barrel-shaped rollers match precision-ground spherical raceways, ensuring uniform load distribution even if shafts deflect and become misaligned. All rollers undergo dimensional classification and screening before assembly to guarantee consistent dimensions within each group and avoid local overload. The products are extensively used in ball mills, rotary kilns, large fans, vibrating screens, ore conveying equipment, papermaking machinery and metallurgical roller tables.

High-purity heavy-duty bearing alloy steel is selected for inner rings, outer rings and barrel rollers. Multiple forging processes refine internal grain structure. Sectional constant-temperature quenching and tempering balance surface hardness of raceways and matrix toughness to resist fatigue spalling caused by continuous vibration and alternating impact loads. Multi-layer precision grinding is implemented on inner and outer raceways to optimize surface micro-texture, facilitate stable formation of lubricating oil film and reduce frictional temperature rise under heavy vibration. All finished products pass geometric dimension inspection, roller grouping verification, radial clearance detection, vibration impact endurance test and sampling life verification. Defective components are eliminated to ensure consistent performance of mass-produced bearings.

Various internal structures, bore types and cage styles are optional. Standard universal outer dimensions ensure good interchangeability for convenient assembly, commissioning, maintenance and replacement on all types of heavy industrial equipment.

Core Product Advantages

Spherical outer raceway structure delivers excellent self-aligning ability to compensate angular deviation caused by shaft deflection and installation misalignment.

Double-row barrel roller design withstands heavy radial loads and bidirectional axial loads simultaneously, featuring high load capacity and outstanding impact resistance.

Optimized spherical profiles of rollers relieve stress concentration under misalignment conditions and reduce risks of fatigue pitting and surface spalling.

Multiple internal structures including CA and CC are available; brass solid cages and stamped steel cages satisfy diverse working conditions.

Two bore types: cylindrical bore and tapered bore. Installation with adapter sleeves enables convenient on-site assembly and clearance adjustment.

High-precision classification and screening of rollers ensure excellent dimensional consistency, evenly disperse loads, delay fatigue wear and extend service life.

Ultra-precision grinding on inner and outer raceways achieves superior surface accuracy, stable operation and effective suppression of vibration noise and abnormal heat generation.

Standardized outer dimensions with strong universality, widely applicable to heavy machinery in mining, cement, fan, metallurgy and papermaking industries.

Typical Application Scenarios

Ball mills, vertical mills, cement rotary kilns and coolers; large centrifugal induced draft fans and blowers; ore conveyors, vibrating screens and crushers; metallurgical rolling mills and roller tables; paper dryers and large pressing equipment; heavy-duty industrial reducers; complete production lines for building materials and aggregates.

Quality Assurance

Raw materials of NMT Spherical Roller Bearings receive sampling inspection for hardness, metallographic structure and non-metallic inclusions upon warehousing to control raw material quality fundamentally. Forged blanks of inner and outer rings fully release residual forging stress and sequentially undergo precision turning, heat treatment, rough grinding and ultra-precision raceway grinding. All barrel-shaped rollers are graded and grouped according to high-precision standards to guarantee uniform load distribution under misalignment and impact conditions. Strength, wear resistance and anti-vibration endurance tests are conducted on formed cages. All finished goods pass visual inspection, clearance screening, geometric precision detection and vibration impact endurance test. Tapered bore bearings receive additional taper precision verification. Non-conforming products are separated independently. Every spherical roller bearing features flexible self-alignment, stable load capacity and reliable vibration resistance, supporting long-term continuous stable operation of heavy industrial production lines.

Product Range

CA type and CC type spherical roller bearings; standard type and reinforced heavy-duty type optional; cylindrical bore and tapered bore optional; stamped steel cages and brass solid cages optional; dimensional specifications cover small-medium bearings up to large heavy-duty bearings. Model selection depends on load magnitude, vibration intensity, shaft deflection degree and assembly method.

Brand Strength

NMT focuses on R&D and manufacturing of heavy-duty industrial bearings. Targeting operating characteristics of mining, cement and fan equipment including heavy loads, continuous vibration, easy shaft deflection and dusty harsh environments, NMT continuously optimizes barrel roller profiles, spherical raceway machining precision, heat treatment technology and lubrication matching design. It solves common industry challenges such as stress concentration under installation misalignment, premature fatigue damage under long-term vibration and excessive operating temperature rise. NMT helps industrial and mining enterprises extend equipment maintenance cycles, cut component replacement costs and guarantee continuous stable operation of complete production lines.