Product Overview
Self-aligning ball bearings 1218M, 2218M, and 1318M are precision-engineered double-row assemblies designed for applications requiring shaft misalignment compensation, vibration control, and reliable rotational performance. Featuring a spherical outer ring raceway, these bearings automatically adjust to angular misalignments between the shaft and housing, minimizing edge loading and maximizing operational stability.
Constructed from premium bearing steel with rigorous dimensional controls, these components deliver low friction, smooth rotation, and extended service life across demanding industrial machinery and transmission systems.
Key Features
Double-Row Architecture: Built with two rows of rolling elements to support higher radial load capacities.
Spherical Outer Raceway: Automatically compensates for angular installation errors and shaft deflections.
Low Friction Operation: Optimized internal geometry ensures smooth, energy-efficient rotation.
Flexible Configuration: Available in open and sealed options tailored to specific operational environments.
High Durability: Engineered for continuous heavy-duty industrial performance and extended maintenance intervals.
Technical Specifications
|
Parameter |
Specification |
|
Bearing Type |
Self-aligning Ball Bearing |
|
Design Structure |
Double Row |
|
Model Series |
1218M / 2218M / 1318M |
|
Bearing Material |
High-Grade Chrome Bearing Steel |
|
Material Standard |
GCr15 / Equivalent Standard |
|
Cage Material |
Steel or Brass Optional |
|
Precision Grade |
P0, P6, P5 Available |
|
Internal Clearance |
C0, C3, C4 Available |
|
Sealing Options |
Open / 2RS |
|
Lubrication Type |
Grease or Oil Lubricated |
|
Operating Temperature |
-30°C to +150°C |
Main Dimensions
|
Model |
Bore Diameter (D) |
Outside Diameter (D) |
Width (B) |
|
1218M |
90 mm |
160 mm |
30 mm |
|
2218M |
90 mm |
160 mm |
40 mm |
|
1318M |
90 mm |
190 mm |
43 mm |
Bearing Design & Working Principle
Internal Geometry: Consists of an inner ring with two raceways, a double-row ball assembly, a cage, and a shared spherical outer ring raceway.
Dynamic Adaptability: Permits the inner ring and rolling elements to pivot freely relative to the outer ring.
Stress Neutralization: Neutralizes angular deviations caused by housing distortion or shaft bending, protecting mechanical assemblies from premature fatigue.
Manufacturing Process
Material Inspection: Chemical composition verification and strict raw material batch tracking ensure structural integrity from the start.
Precision Machining: Advanced turning and grinding operations deliver tight dimensional tolerances and superior surface finishes.
Heat Treatment: Controlled thermal processing achieves optimal hardness profiles and long-term dimensional stability.
Assembly & Testing: Automated ball sorting, cage fitting, and rigorous vibration testing guarantee final product quality.
Quality Control & Certifications
Quality control is integrated throughout the complete manufacturing process, from raw material selection to final inspection.
Our quality management system complies with:
- ISO9001 Quality Management System
- IATF16949 Automotive Quality Management System
- CE Certification
- SGS Certification
- RoHS Compliance
- MSDS Documentation Support
Each production batch can be supported with inspection records, material traceability documentation, and quality verification reports according to customer requirements.
Customization & OEM Capability
Internal radial clearances adjusted to meet unique thermal and speed requirements.
Custom fill greases or specialized oil coatings supplied upon request.
Customized laser marking and specialized industrial packaging options available.
Engineering support for specialized dimensions and performance criteria.
Applications
Electric Motors: Integrated into large generators and industrial electric drive systems.
Agricultural Machinery: Applied in high-vibration field equipment and drive shafts.
Conveyor Systems: Utilized in material handling pulleys and roller assemblies.
Industrial Fans: Deployed in heavy-duty blowers, ventilation units, and air handling systems.
General Machinery: Used across textile units, packaging lines, and heavy industrial gearboxes.
Packaging & Delivery
Corrosion Protection: Treated with specialized anti-rust agents prior to wrapping.
Individual Sealing: Secured in protective individual boxes to prevent transit damage.
Export Cartons: Packed in heavy-duty corrugated cartons designed for international shipping logistics.
Logistics Support: Flexible delivery schedules accommodating sample requests and high-volume procurement contracts.
FAQ
Q: What is the primary function of a self-aligning ball bearing?
A: They compensate for angular shaft misalignments and housing deformations, protecting the mechanical drive train from localized stress and premature wear.
Q: How do models 1218M, 2218M, and 1318M differ?
A: While all three share bore diameter specifications, they vary in outside diameter and width dimensions to accommodate different load capacities and spatial constraints.
Q: What materials are utilized for the bearing cages?
A: The cages are manufactured using high-strength steel or brass options, selected based on specific operational speed and temperature requirements.
Q: Are these bearings suitable for high-temperature environments?
A: Yes, standard configurations operate reliably within a temperature range of -30°C to +150°C through specialized heat treatment processes.
Q: How is transit protection handled for international shipping?
A: Components receive specialized anti-rust treatments, individual protective boxing, and heavy-duty corrugated export carton packaging to ensure safe delivery.
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