INDUSTRY COMPONENT

Foot/Heel Pin Assembly

Foot/Heel Pin Assembly is a critical mechanical component in luffing mechanisms that provides pivot points and load transfer between structural elements.

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Component Specifications

Definition
The Foot/Heel Pin Assembly is a precision-engineered mechanical assembly used in luffing mechanisms of cranes and similar equipment. It consists of hardened steel pins, bushings, retaining mechanisms, and mounting hardware that create robust pivot connections between the boom foot section and the rotating base or heel structure. This assembly facilitates controlled angular movement while transferring substantial compressive, tensile, and shear loads during luffing operations.
Working Principle
The assembly operates on the principle of rotational bearing surfaces and mechanical fastening. The hardened pins serve as axles that allow rotational movement between connected components, while the bushings provide wear-resistant bearing surfaces. Retaining mechanisms (such as cotter pins, lock nuts, or retaining rings) secure the pins in position, maintaining alignment and preventing unintended disengagement during dynamic loading cycles.
Materials
High-strength alloy steel (typically AISI 4140 or 4340) for pins, hardened to 45-55 HRC; bronze or polymer composite bushings (bronze alloy C93200 or UHMW-PE); corrosion-resistant steel for mounting hardware; optional protective coatings (zinc plating, phosphate coating, or paint).
Technical Parameters
  • Pin Length 200-600 mm
  • Pin Diameter 50-150 mm
  • Pin Hardness 45-55 HRC
  • Load Capacity 50-500 kN static, 25-250 kN dynamic
  • Surface Finish Ra 0.8-1.6 μm
  • Bushing ID Tolerance H7
  • Operating Temperature -20°C to +80°C
Standards
ISO 286-2, DIN 6325, ISO 2768-mK, DIN 7172

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Foot/Heel Pin Assembly.

luffing mechanism pin assembly crane heel pin foot pivot component mechanical pin assembly industrial pivot hardware luffing crane components heavy-duty pin connections Foot/Heel Pin Assembly Foot/Heel Pin Assembly in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Luffing Mechanism

A mechanical system that enables the luffing jib crane to change the angle of its jib relative to the horizontal plane.

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Engineering Analysis

Risks & Mitigation
  • Pin shear failure under overload
  • Bushing wear leading to excessive clearance
  • Corrosion in marine environments
  • Improper installation causing misalignment
  • Fatigue cracking in high-cycle applications
FMEA Triads
Trigger: Insufficient lubrication
Failure: Accelerated bushing wear and increased friction
Mitigation: Implement scheduled lubrication program with appropriate high-pressure grease
Trigger: Overload beyond design limits
Failure: Pin deformation or shear fracture
Mitigation: Install load monitoring systems and operator training on load limits
Trigger: Corrosive environment exposure
Failure: Pitting and reduced cross-sectional strength
Mitigation: Apply corrosion-resistant coatings and implement regular inspection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Pin diameter: h9, Bushing bore: H7, Concentricity: 0.1 mm TIR, Surface hardness: ±3 HRC
Test Method
Ultrasonic testing for internal defects, hardness testing per ISO 6508, dimensional verification with CMM, load testing to 150% of rated capacity

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 maintenance is required for Foot/Heel Pin Assemblies?

Regular inspection for wear on pins and bushings, lubrication of bearing surfaces every 250-500 operating hours, torque verification on retaining hardware during scheduled maintenance, and replacement when wear exceeds manufacturer specifications.

How do I determine the correct pin diameter for my application?

Calculate based on maximum shear and bending loads using engineering formulas, consider safety factors (typically 3-5 for dynamic loads), and verify compatibility with existing mounting interfaces and bushing specifications.

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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