Bearing Bushings: Load Capacity Up to 50 MPa, Length 15-150 mm

Component Specifications

Definition

Bearing bushings, also known as plain bearings or sleeve bearings, are precision-engineered cylindrical components designed to support rotating shafts while minimizing friction and wear. In pivot connection assemblies, they serve as the interface between stationary and moving parts, providing radial support, alignment, and load distribution. These components typically feature a smooth inner surface for shaft rotation and may include lubrication grooves or channels to enhance performance and longevity.

Working Principle

Bearing bushings operate on the principle of hydrodynamic or boundary lubrication, where a thin film of lubricant separates the rotating shaft from the bushing surface, reducing direct metal-to-metal contact. In pivot connections, they allow rotational movement while maintaining precise alignment and absorbing radial loads through their cylindrical design. The bushing material's inherent properties (such as low friction coefficient and wear resistance) combined with proper lubrication enable smooth operation with minimal energy loss.

Materials

Common materials include bronze alloys (SAE 660, C93200), sintered metals with oil impregnation, polymer composites (PTFE, nylon, acetal), babbitt metals, and aluminum alloys. Material selection depends on load capacity, speed, temperature, and lubrication requirements.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	15-150 mm
Clearance	0.02-0.1 mm
Load Capacity	Up to 50 MPa
Inner Diameter	10-100 mm
Outer Diameter	15-120 mm
Surface Finish	Ra 0.4-1.6 μm
Temperature Range	-40°C to 200°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 3547, DIN 1494, ISO 4379, DIN 1850

Parent Products

This component is used in the following industrial products

Pivot Connection Assembly

A mechanical assembly that provides rotational connection between structural members, allowing controlled movement while maintaining structural integrity.

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Engineering Analysis

Risks & Mitigation

Overheating due to insufficient lubrication
Premature wear from misalignment
Seizure from excessive clearance or contamination
Fatigue failure under cyclic loading
Corrosion in harsh environments

FMEA Triads

Trigger: Inadequate lubrication or lubricant contamination
Failure: Increased friction leading to overheating and seizure
Mitigation: Implement regular lubrication schedules, use proper lubricants, install filtration systems, and monitor lubricant quality

Trigger: Shaft misalignment exceeding design tolerances
Failure: Uneven wear, reduced load capacity, and premature failure
Mitigation: Ensure precise installation alignment, use alignment tools during assembly, implement regular alignment checks

Trigger: Excessive radial loads or shock loads
Failure: Plastic deformation, cracking, or fatigue failure
Mitigation: Design with appropriate safety factors, install overload protection devices, monitor operating conditions

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 286-2:2010 for dimensional tolerances, ISO 1101 for geometrical tolerances

Test Method

ISO 7904-1 for hydrodynamic plain bearings, ASTM D3702 for wear rate testing, ISO 4378 for friction and wear testing

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Bearing Bushings

Manufacturer profiles associated with Bearing Bushings.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between bearing bushings and ball bearings?

Bearing bushings (plain bearings) provide sliding contact with the shaft using a continuous surface, while ball bearings use rolling elements (balls) between races. Bushings are typically simpler, quieter, and better for low-speed/high-load applications, while ball bearings excel at higher speeds with lower friction.

How often should bearing bushings be lubricated?

Lubrication frequency depends on the bushing type: self-lubricating bushings may require minimal maintenance, while metallic bushings in continuous operation typically need lubrication every 500-2000 hours. Always follow manufacturer recommendations based on load, speed, and operating conditions.

What are common failure signs for bearing bushings?

Common failure indicators include increased operating temperature, unusual noise (squeaking or grinding), excessive vibration, visible wear or scoring on the bushing surface, increased clearance between shaft and bushing, and lubricant leakage or contamination.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Bearing Bushings