INDUSTRY COMPONENT

Sheave Pins/Bushings

Sheave pins and bushings are precision components that secure and align sheaves on jib/boom machinery, enabling smooth cable movement and load transfer.

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Component Specifications

Definition
Sheave pins are cylindrical fasteners that mount sheaves to jib/boom structures, while bushings are sleeve-like inserts that reduce friction and wear between rotating sheaves and stationary pins. These components work together to maintain proper sheave alignment, distribute mechanical loads, and ensure efficient cable or rope guidance in lifting and material handling equipment.
Working Principle
Sheave pins provide fixed mounting points for sheaves, transferring rotational forces to the jib/boom structure. Bushings create a low-friction interface between the sheave's inner diameter and the pin's outer surface, allowing smooth rotation while preventing metal-to-metal contact and reducing wear through controlled clearance and lubrication.
Materials
Pins: Typically made from alloy steel (AISI 4140/4340) or stainless steel (316/304) with hardness 35-45 HRC. Bushings: Bronze alloys (SAE 660/CA932), sintered bronze with oil impregnation, or polymer composites (UHMW-PE, nylon) with specific wear resistance properties.
Technical Parameters
  • Pin Diameter 12-50 mm
  • Load Capacity 5-50 kN
  • Surface Finish Ra 0.8-1.6 μm
  • Length Tolerance ±0.1 mm
  • Operating Temperature -20°C to 120°C
  • Bushing Wall Thickness 3-10 mm
Standards
ISO 286-2, DIN 1494, ISO 4378-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sheave Pins/Bushings.

sheave pins sheave bushings jib boom components cable sheave hardware lifting equipment parts friction reduction bushings mechanical power transmission Sheave Pins/Bushings Sheave Pins/Bushings in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Jib/Boom

The horizontal or inclined structural member of a jib crane that extends outward to provide reach for lifting and moving loads.

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Traveling Block

A pulley system component in drilling rigs that moves vertically to hoist and lower the drill string.

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Engineering Analysis

Risks & Mitigation
  • Wear-induced clearance increase
  • Corrosion in marine environments
  • Improper installation causing misalignment
  • Material fatigue under cyclic loading
  • Lubrication failure leading to seizure
FMEA Triads
Trigger: Inadequate lubrication
Failure: Increased friction, overheating, and premature wear
Mitigation: Implement scheduled lubrication protocols, use self-lubricating bushings, install automatic lubrication systems
Trigger: Misalignment during installation
Failure: Uneven load distribution, accelerated wear on one side, potential sheave binding
Mitigation: Use alignment tools during installation, follow torque specifications, implement installation training programs
Trigger: Corrosive environment exposure
Failure: Material degradation, reduced structural integrity, increased friction surfaces
Mitigation: Select corrosion-resistant materials (stainless steel, bronze), apply protective coatings, implement regular cleaning schedules

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
H7/g6 fit for pins and bushings, radial clearance 0.05-0.15 mm depending on application
Test Method
Dimensional verification per ISO 286-2, hardness testing per ISO 6508, wear testing per ASTM G99, load testing per ISO 4301

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of sheave bushings?

Sheave bushings reduce friction between rotating sheaves and stationary pins, prevent metal-to-metal contact, distribute loads evenly, and extend component lifespan through controlled wear surfaces.

How often should sheave pins and bushings be inspected?

Inspect every 250-500 operating hours or during routine maintenance cycles. Check for wear patterns, corrosion, deformation, and proper lubrication. Replace when wear exceeds 10% of original dimensions or when surface damage is visible.

Can different material combinations be used for pins and bushings?

Yes, common combinations include steel pins with bronze bushings for general applications, stainless steel pins with polymer bushings for corrosive environments, and hardened steel pins with oil-impregnated bronze for high-load applications.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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