INDUSTRY COMPONENT

Support Bearings

Support bearings are precision components that provide radial and axial support for rotating shafts in lead screw assemblies, ensuring smooth linear motion and load distribution.

Component Specifications

Definition
Support bearings are specialized rolling-element bearings designed to support the rotating screw shaft in lead screw assemblies. They maintain precise alignment, reduce friction, and handle both radial loads (perpendicular to shaft) and axial loads (parallel to shaft) generated during linear motion conversion. These bearings are critical for maintaining positional accuracy, minimizing deflection, and extending the service life of the entire lead screw system by preventing excessive wear and vibration.
Working Principle
Support bearings operate on the principle of rolling contact between inner and outer rings with rolling elements (balls or rollers) in between. When the lead screw rotates, the bearings allow smooth rotation while constraining radial and axial movement. They convert sliding friction into rolling friction, significantly reducing torque requirements and heat generation. The bearing geometry and preload determine stiffness and load capacity, directly affecting the lead screw's positioning accuracy and repeatability.
Materials
Bearing rings: Chrome steel (AISI 52100/SUJ2), stainless steel (AISI 440C), or ceramic (Si3N4). Rolling elements: Chrome steel, ceramic, or silicon nitride. Retainers: Steel, brass, or polymer (PEEK, PTFE). Seals: Nitrile rubber, fluorocarbon, or metal shields. Lubrication: Grease (mineral or synthetic base with lithium/urea thickeners) or oil.
Technical Parameters
  • Width 6-37 mm
  • Clearance C0, C2, C3, C4, C5
  • Speed Limit 10,000-30,000 rpm (grease lubricated)
  • Bore Diameter 6-100 mm
  • Precision Grade ABEC 1, 3, 5, 7, or 9
  • Outside Diameter 19-180 mm
  • Static Load Rating 1.2-75 kN
  • Dynamic Load Rating 2.5-150 kN
  • Operating Temperature -30°C to +120°C (standard), up to +200°C (high-temp variants)
Standards
ISO 15, ISO 104, DIN 625-1, DIN 5412

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Support Bearings.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Bearing seizure due to inadequate lubrication
  • Premature wear from contamination ingress
  • Reduced accuracy from improper preload
  • Catastrophic failure from overload conditions
  • Corrosion in harsh environments
FMEA Triads
Trigger: Insufficient or degraded lubrication
Failure: Increased friction, overheating, and eventual bearing seizure
Mitigation: Implement scheduled lubrication maintenance, use proper grease quantity/type, install automatic lubrication systems, monitor temperature
Trigger: Contamination from dust, chips, or moisture
Failure: Abrasive wear, pitting, reduced bearing life
Mitigation: Install effective seals or shields, maintain clean operating environment, use bearing isolators, implement proper filtration
Trigger: Improper installation or misalignment
Failure: Uneven load distribution, increased vibration, premature fatigue
Mitigation: Follow manufacturer installation procedures, use proper tools, verify alignment with dial indicators, apply correct mounting forces

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Radial runout: 2-10 μm depending on precision grade; Axial play: 0-15 μm; Dimensional tolerance: ISO 492 Class Normal or higher
Test Method
Vibration analysis per ISO 15242, noise testing per ISO 13373, load testing per ISO 76, life testing per ISO 281, dimensional inspection per ISO 1132

Buyer Feedback

★★★★☆ 4.7 / 5.0 (33 reviews)

"The Support Bearings we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."

"Found 41+ suppliers for Support Bearings on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Support Bearings is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What is the difference between angular contact and deep groove support bearings for lead screws?

Angular contact bearings are designed to handle combined radial and axial loads simultaneously with high precision, making them ideal for lead screws requiring accurate positioning. Deep groove bearings primarily handle radial loads with limited axial capacity and are used in less demanding applications. Angular contact bearings typically have higher stiffness and better speed performance for precision linear motion systems.

How often should support bearings be lubricated?

Lubrication intervals depend on operating conditions: continuous operation at moderate speeds typically requires regreasing every 6-12 months, while high-speed or high-temperature applications may need lubrication every 3-6 months. Sealed bearings are lubricated for life under normal conditions. Always follow manufacturer recommendations and monitor bearing temperature and noise for maintenance cues.

What are common signs of support bearing failure in lead screw assemblies?

Common failure indicators include increased operating temperature (more than 70°C above ambient), abnormal noise (grinding, clicking, or rumbling), excessive vibration, increased torque requirements, reduced positioning accuracy, visible wear or discoloration, and lubricant leakage. Regular vibration analysis and temperature monitoring can help detect early failure signs.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Support Bearing / Bushing Support Bearings / Bushings