INDUSTRY COMPONENT

Cage

A cage is a bearing component that separates and guides rolling elements in precision bearings to maintain proper spacing and alignment.

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Component Specifications

Definition
The cage, also known as a retainer or separator, is a critical component in rolling-element bearings that positions and spaces the rolling elements (balls or rollers) evenly around the bearing raceways. It prevents contact between adjacent rolling elements, reduces friction and wear, ensures uniform load distribution, and maintains proper alignment during operation. In precision bearings, cages are engineered to minimize vibration, noise, and heat generation while maximizing rotational accuracy and longevity.
Working Principle
The cage operates by physically separating rolling elements within a bearing assembly. It maintains consistent spacing between elements to prevent skidding, sliding, or collision, which reduces friction and wear. During rotation, the cage moves at approximately half the speed of the rolling elements, guiding them smoothly along the raceways. This ensures even load distribution, minimizes centrifugal forces, and enhances bearing stability, particularly in high-speed or precision applications.
Materials
Common materials include: low-carbon steel (for general applications), stainless steel (for corrosion resistance), brass (for good machinability and conductivity), polyamide (PA66 or PEEK for lightweight, low-friction applications), and phenolic resin (for high-temperature resistance). Material selection depends on factors like speed, load, temperature, lubrication, and environmental conditions.
Technical Parameters
  • Cage Type Stamped, Machined, or Molded
  • Clearance Radial and axial play specifications
  • Speed Limit Defined by DN value (bore diameter in mm × RPM)
  • Rolling Element Type Ball, Cylindrical Roller, Tapered Roller, or Needle Roller
  • Lubrication Compatibility Oil, Grease, or Dry
  • Operating Temperature Range -40°C to +150°C (varies by material)
Standards
ISO 1132, DIN 5418

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cage.

bearing cage precision bearing component retainer separator rolling element bearing cage material bearing standards industrial machinery parts Cage Cage in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Precision Bearings

High-accuracy rolling elements designed to support radial and axial loads with minimal friction in rotating machinery.

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Vibration Bearings

Specialized bearings designed to accommodate and manage vibration loads in mechanical systems.

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Engineering Analysis

Risks & Mitigation
  • Cage fracture under excessive load or impact
  • Wear from inadequate lubrication
  • Corrosion in harsh environments
  • Thermal deformation at high temperatures
  • Misalignment during installation
FMEA Triads
Trigger: Overloading or shock loads
Failure: Cage deformation or breakage
Mitigation: Design with safety margins, use robust materials like steel, and implement load monitoring systems.
Trigger: Insufficient or contaminated lubrication
Failure: Increased friction and wear, leading to cage seizure
Mitigation: Follow lubrication schedules, use clean lubricants, and apply seals or shields.
Trigger: High operating speeds
Failure: Centrifugal forces causing cage instability or fatigue
Mitigation: Use lightweight materials (e.g., polyamide), optimize cage design, and limit speed to rated values.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Typically within ±0.05 mm for dimensional accuracy, per ISO 492
Test Method
Dimensional inspection (CMM), material hardness testing, fatigue life testing (e.g., ABEC standards), and vibration analysis

Buyer Feedback

★★★★☆ 4.6 / 5.0 (14 reviews)

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Cage meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Cage arrived with full certification."

"Great transparency on the Cage components. Essential for our Machinery and Equipment Manufacturing supply chain."

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Frequently Asked Questions

What is the primary function of a bearing cage?

The primary function is to separate and guide rolling elements (like balls or rollers) in a bearing, ensuring even spacing to reduce friction, prevent contact between elements, and maintain alignment for smooth operation.

How does cage material affect bearing performance?

Material impacts durability, speed capability, temperature resistance, and corrosion resistance. For example, steel cages handle high loads, polyamide cages reduce weight and friction for high speeds, and brass offers good machinability for complex designs.

Can a damaged cage be repaired or must it be replaced?

Cages are typically replaced if damaged, as repairs are impractical and may compromise bearing integrity. Damage can lead to increased vibration, noise, and premature bearing failure.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Cable/Pneumatic Pass-through Cage Body