Product Introduction

The 213 series consists of standardized, double-row Spherical Roller Bearings designed for heavy-duty applications with a relatively narrow profile. Featuring a spherical outer ring raceway and symmetrical double-row barrel-shaped rollers, these bearings offer excellent self-aligning capabilities—compensating for shaft deflection and installation misalignment—with a maximum self-aligning angle of 1° to 1.5°. They are engineered for high radial load capacity while also accommodating bidirectional axial loads. Their compact design—featuring a larger outer diameter and narrower width for a given bore size—delivers superior load-bearing performance compared to the 222 series, making them ideal for heavy-duty applications where space is limited. With excellent vibration and shock resistance, they are designed for low-to-medium speed, heavy-duty machinery and serve as core transmission components in sectors such as mining, metallurgy, and construction materials.

Materials and Model Designation

Core Material: The bearing body is made of high-carbon chromium bearing steel (GCr15). Precision heat treatment achieves a hardness of HRC 60–64, ensuring wear resistance, fatigue resistance, and dimensional stability. Cage options include stamped steel (cost-effective and versatile) and solid brass (high-temperature resistant, shock-resistant, and deformation-resistant, suitable for harsh operating conditions).

Model Suffix Definitions: "CC" denotes a stamped steel cage (economical, general-purpose); "CA" denotes a solid brass cage (preferred for heavy-duty applications); "E/E1" indicates an optimized, reinforced design with larger rollers for enhanced load capacity; "K" signifies a 1:12 tapered bore (suitable for adapter sleeve mounting); "W33" indicates an outer ring with a lubrication groove and holes (facilitating easy relubrication); "C3/C4" denotes increased internal clearance (suitable for high-temperature or high-vibration/shock environments). Bearings are available with either cylindrical or tapered bores to suit various shaft mounting requirements. 

Core Specifications

The dimensional accuracy of the 213 series bearings complies with national and DIN standards, making them suitable for installation in standardized equipment. Common core specifications are as follows:

Large-scale, heavy-duty drive equipment.

Permissible operating temperature range: -30°C to 120°C; suitable for low-to-medium speed operation; ultra-high-speed use is prohibited.

Application Scenarios

Designed for heavy-duty, high-vibration, and high-misalignment conditions, as well as applications involving shaft deformation. Widely used in various heavy industrial machinery: vibrating screens, crushers, and drum conveyors in the mining sector; large blowers, draft fans, and mixers in industrial settings; auxiliary rolls for rolling mills and conveying equipment in the metallurgical industry; and heavy-duty drive components in construction materials, chemical processing, and engineering machinery. Not suitable for pure axial loads or ultra-high rotational speeds. Serves as a targeted replacement for standard Roller Bearings, effectively reducing equipment issues such as abnormal noise, sticking, and wear-related failures.

Manufacturing Process

Utilizes a precision integrated mass-production process with strict accuracy control throughout: 

1. Raw material selection: High-purity bearing steel is used to eliminate impurities and defects; 

2. Precision forging: Steel microstructure is refined after forming to enhance structural strength; 

3. CNC precision grinding: Raceways, rollers, and inner/outer rings undergo high-precision grinding to ensure fit accuracy and smooth operation; 

4. Constant-temperature heat treatment: Quenching and tempering stabilize material hardness, eliminate internal stress, and prevent deformation during long-term use; 

5. Super-finishing/polishing: Reduces the friction coefficient and improves wear resistance; 

6. Final inspection and screening: Strict testing of dimensional accuracy, internal clearance, and appearance; defective products are rejected to ensure product consistency and stability.

Installation and Usage Guidelines

1. Before installation, clean the shaft and bearing housing to remove impurities and oil stains; ensure mounting surfaces are clean and flat to prevent wear caused by trapped foreign objects. 

2. Low-temperature heating is the preferred installation method; heating temperature must not exceed 110°C. Open-flame heating and forceful hammering are prohibited to avoid structural damage to the bearing. 

3. Bearings with cylindrical bores are suitable for interference fits on stepped shafts; bearings with tapered bores are installed using adapter sleeves or withdrawal sleeves, making them suitable for use on plain shafts. 

4. After installation, verify coaxiality and control alignment errors to ensure optimal self-aligning performance; forced eccentric operation is strictly prohibited. 

5. During initial startup, perform a 30-minute low-speed, no-load break-in run; proceed to full-load operation only after confirming the absence of abnormal noise or overheating.

Maintenance and Care

1. Lubrication: For W33 models featuring an oil groove, lubricant can be replenished without stopping the machine; for standard models, apply lithium-based grease periodically. Use specialized high-temperature grease for high-temperature applications to prevent dry running due to lack of lubrication. 

2. Periodic Inspection: Monitor bearing temperature, operating noise, and vibration amplitude daily; shut down immediately for inspection if abnormal noise occurs or temperatures rise rapidly. 

3. Operating Conditions: Shorten maintenance intervals for high-temperature, dusty, or humid environments, and ensure adequate dust and moisture protection. 

4. Disassembly and Storage: Seal properly after disassembly to prevent moisture-induced rust, impacts, or deformation that could compromise precision. 

5. Replacement: Replace promptly in cases of severe wear, excessive internal clearance, or persistent, unfixable abnormal noise to prevent equipment failure escalation.

Core Product Advantages

Excellent self-aligning capability and tolerance for installation misalignment and shaft deformation; superior radial load capacity with high resistance to shock and vibration; compact design suitable for tight installation spaces; comprehensive model range and high versatility for easy replacement; low maintenance costs and long service life, effectively reducing equipment maintenance frequency and production costs.